Spaces:
Sleeping
Sleeping
File size: 41,462 Bytes
d086b80 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 | <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<!-- Created by , GNU Texinfo 7.1 -->
<head>
<meta charset="utf-8">
<title>
ffplay Documentation
</title>
<meta name="viewport" content="width=device-width,initial-scale=1.0">
<link rel="stylesheet" type="text/css" href="bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="style.min.css">
</head>
<body>
<div class="container">
<h1>
ffplay Documentation
</h1>
<a name="SEC_Top"></a>
<div class="element-contents" id="SEC_Contents">
<h2 class="contents-heading">Table of Contents</h2>
<div class="contents">
<ul class="toc-numbered-mark">
<li><a id="toc-Synopsis" href="#Synopsis">1 Synopsis</a></li>
<li><a id="toc-Description" href="#Description">2 Description</a></li>
<li><a id="toc-Options" href="#Options">3 Options</a>
<ul class="toc-numbered-mark">
<li><a id="toc-Stream-specifiers-1" href="#Stream-specifiers-1">3.1 Stream specifiers</a></li>
<li><a id="toc-Generic-options" href="#Generic-options">3.2 Generic options</a></li>
<li><a id="toc-AVOptions" href="#AVOptions">3.3 AVOptions</a></li>
<li><a id="toc-Main-options" href="#Main-options">3.4 Main options</a></li>
<li><a id="toc-Advanced-options" href="#Advanced-options">3.5 Advanced options</a></li>
<li><a id="toc-While-playing" href="#While-playing">3.6 While playing</a></li>
</ul></li>
<li><a id="toc-See-Also" href="#See-Also">4 See Also</a></li>
<li><a id="toc-Authors" href="#Authors">5 Authors</a></li>
</ul>
</div>
</div>
<a name="Synopsis"></a>
<h2 class="chapter">1 Synopsis<span class="pull-right"><a class="anchor hidden-xs" href="#Synopsis" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Synopsis" aria-hidden="true">TOC</a></span></h2>
<p>ffplay [<var class="var">options</var>] [<samp class="file">input_url</samp>]
</p>
<a name="Description"></a>
<h2 class="chapter">2 Description<span class="pull-right"><a class="anchor hidden-xs" href="#Description" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Description" aria-hidden="true">TOC</a></span></h2>
<p>FFplay is a very simple and portable media player using the FFmpeg
libraries and the SDL library. It is mostly used as a testbed for the
various FFmpeg APIs.
</p>
<a name="Options"></a>
<h2 class="chapter">3 Options<span class="pull-right"><a class="anchor hidden-xs" href="#Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Options" aria-hidden="true">TOC</a></span></h2>
<p>All the numerical options, if not specified otherwise, accept a string
representing a number as input, which may be followed by one of the SI
unit prefixes, for example: ’K’, ’M’, or ’G’.
</p>
<p>If ’i’ is appended to the SI unit prefix, the complete prefix will be
interpreted as a unit prefix for binary multiples, which are based on
powers of 1024 instead of powers of 1000. Appending ’B’ to the SI unit
prefix multiplies the value by 8. This allows using, for example:
’KB’, ’MiB’, ’G’ and ’B’ as number suffixes.
</p>
<p>Options which do not take arguments are boolean options, and set the
corresponding value to true. They can be set to false by prefixing
the option name with "no". For example using "-nofoo"
will set the boolean option with name "foo" to false.
</p>
<p>Options that take arguments support a special syntax where the argument given on
the command line is interpreted as a path to the file from which the actual
argument value is loaded. To use this feature, add a forward slash ’/’
immediately before the option name (after the leading dash). E.g.
</p><div class="example">
<pre class="example-preformatted">ffmpeg -i INPUT -/filter:v filter.script OUTPUT
</pre></div>
<p>will load a filtergraph description from the file named <samp class="file">filter.script</samp>.
</p>
<a class="anchor" id="Stream-specifiers"></a><a name="Stream-specifiers-1"></a>
<h3 class="section">3.1 Stream specifiers<span class="pull-right"><a class="anchor hidden-xs" href="#Stream-specifiers-1" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Stream-specifiers-1" aria-hidden="true">TOC</a></span></h3>
<p>Some options are applied per-stream, e.g. bitrate or codec. Stream specifiers
are used to precisely specify which stream(s) a given option belongs to.
</p>
<p>A stream specifier is a string generally appended to the option name and
separated from it by a colon. E.g. <code class="code">-codec:a:1 ac3</code> contains the
<code class="code">a:1</code> stream specifier, which matches the second audio stream. Therefore, it
would select the ac3 codec for the second audio stream.
</p>
<p>A stream specifier can match several streams, so that the option is applied to all
of them. E.g. the stream specifier in <code class="code">-b:a 128k</code> matches all audio
streams.
</p>
<p>An empty stream specifier matches all streams. For example, <code class="code">-codec copy</code>
or <code class="code">-codec: copy</code> would copy all the streams without reencoding.
</p>
<p>Possible forms of stream specifiers are:
</p><dl class="table">
<dt><samp class="option"><var class="var">stream_index</var></samp></dt>
<dd><p>Matches the stream with this index. E.g. <code class="code">-threads:1 4</code> would set the
thread count for the second stream to 4. If <var class="var">stream_index</var> is used as an
additional stream specifier (see below), then it selects stream number
<var class="var">stream_index</var> from the matching streams. Stream numbering is based on the
order of the streams as detected by libavformat except when a stream group
specifier or program ID is also specified. In this case it is based on the
ordering of the streams in the group or program.
</p></dd>
<dt><samp class="option"><var class="var">stream_type</var>[:<var class="var">additional_stream_specifier</var>]</samp></dt>
<dd><p><var class="var">stream_type</var> is one of following: ’v’ or ’V’ for video, ’a’ for audio, ’s’
for subtitle, ’d’ for data, and ’t’ for attachments. ’v’ matches all video
streams, ’V’ only matches video streams which are not attached pictures, video
thumbnails or cover arts. If <var class="var">additional_stream_specifier</var> is used, then
it matches streams which both have this type and match the
<var class="var">additional_stream_specifier</var>. Otherwise, it matches all streams of the
specified type.
</p></dd>
<dt><samp class="option">g:<var class="var">group_specifier</var>[:<var class="var">additional_stream_specifier</var>]</samp></dt>
<dd><p>Matches streams which are in the group with the specifier <var class="var">group_specifier</var>.
if <var class="var">additional_stream_specifier</var> is used, then it matches streams which both
are part of the group and match the <var class="var">additional_stream_specifier</var>.
<var class="var">group_specifier</var> may be one of the following:
</p><dl class="table">
<dt><samp class="option"><var class="var">group_index</var></samp></dt>
<dd><p>Match the stream with this group index.
</p></dd>
<dt><samp class="option">#<var class="var">group_id</var> or i:<var class="var">group_id</var></samp></dt>
<dd><p>Match the stream with this group id.
</p></dd>
</dl>
</dd>
<dt><samp class="option">p:<var class="var">program_id</var>[:<var class="var">additional_stream_specifier</var>]</samp></dt>
<dd><p>Matches streams which are in the program with the id <var class="var">program_id</var>. If
<var class="var">additional_stream_specifier</var> is used, then it matches streams which both
are part of the program and match the <var class="var">additional_stream_specifier</var>.
</p>
</dd>
<dt><samp class="option">#<var class="var">stream_id</var> or i:<var class="var">stream_id</var></samp></dt>
<dd><p>Match the stream by stream id (e.g. PID in MPEG-TS container).
</p></dd>
<dt><samp class="option">m:<var class="var">key</var>[:<var class="var">value</var>]</samp></dt>
<dd><p>Matches streams with the metadata tag <var class="var">key</var> having the specified value. If
<var class="var">value</var> is not given, matches streams that contain the given tag with any
value. The colon character ’:’ in <var class="var">key</var> or <var class="var">value</var> needs to be
backslash-escaped.
</p></dd>
<dt><samp class="option">disp:<var class="var">dispositions</var>[:<var class="var">additional_stream_specifier</var>]</samp></dt>
<dd><p>Matches streams with the given disposition(s). <var class="var">dispositions</var> is a list of
one or more dispositions (as printed by the <samp class="option">-dispositions</samp> option)
joined with ’+’.
</p></dd>
<dt><samp class="option">u</samp></dt>
<dd><p>Matches streams with usable configuration, the codec must be defined and the
essential information such as video dimension or audio sample rate must be present.
</p>
<p>Note that in <code class="command">ffmpeg</code>, matching by metadata will only work properly for
input files.
</p></dd>
</dl>
<a name="Generic-options"></a>
<h3 class="section">3.2 Generic options<span class="pull-right"><a class="anchor hidden-xs" href="#Generic-options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Generic-options" aria-hidden="true">TOC</a></span></h3>
<p>These options are shared amongst the ff* tools.
</p>
<dl class="table">
<dt><samp class="option">-L</samp></dt>
<dd><p>Show license.
</p>
</dd>
<dt><samp class="option">-h, -?, -help, --help [<var class="var">arg</var>]</samp></dt>
<dd><p>Show help. An optional parameter may be specified to print help about a specific
item. If no argument is specified, only basic (non advanced) tool
options are shown.
</p>
<p>Possible values of <var class="var">arg</var> are:
</p><dl class="table">
<dt><samp class="option">long</samp></dt>
<dd><p>Print advanced tool options in addition to the basic tool options.
</p>
</dd>
<dt><samp class="option">full</samp></dt>
<dd><p>Print complete list of options, including shared and private options
for encoders, decoders, demuxers, muxers, filters, etc.
</p>
</dd>
<dt><samp class="option">decoder=<var class="var">decoder_name</var></samp></dt>
<dd><p>Print detailed information about the decoder named <var class="var">decoder_name</var>. Use the
<samp class="option">-decoders</samp> option to get a list of all decoders.
</p>
</dd>
<dt><samp class="option">encoder=<var class="var">encoder_name</var></samp></dt>
<dd><p>Print detailed information about the encoder named <var class="var">encoder_name</var>. Use the
<samp class="option">-encoders</samp> option to get a list of all encoders.
</p>
</dd>
<dt><samp class="option">demuxer=<var class="var">demuxer_name</var></samp></dt>
<dd><p>Print detailed information about the demuxer named <var class="var">demuxer_name</var>. Use the
<samp class="option">-formats</samp> option to get a list of all demuxers and muxers.
</p>
</dd>
<dt><samp class="option">muxer=<var class="var">muxer_name</var></samp></dt>
<dd><p>Print detailed information about the muxer named <var class="var">muxer_name</var>. Use the
<samp class="option">-formats</samp> option to get a list of all muxers and demuxers.
</p>
</dd>
<dt><samp class="option">filter=<var class="var">filter_name</var></samp></dt>
<dd><p>Print detailed information about the filter named <var class="var">filter_name</var>. Use the
<samp class="option">-filters</samp> option to get a list of all filters.
</p>
</dd>
<dt><samp class="option">bsf=<var class="var">bitstream_filter_name</var></samp></dt>
<dd><p>Print detailed information about the bitstream filter named <var class="var">bitstream_filter_name</var>.
Use the <samp class="option">-bsfs</samp> option to get a list of all bitstream filters.
</p>
</dd>
<dt><samp class="option">protocol=<var class="var">protocol_name</var></samp></dt>
<dd><p>Print detailed information about the protocol named <var class="var">protocol_name</var>.
Use the <samp class="option">-protocols</samp> option to get a list of all protocols.
</p></dd>
</dl>
</dd>
<dt><samp class="option">-version</samp></dt>
<dd><p>Show version.
</p>
</dd>
<dt><samp class="option">-buildconf</samp></dt>
<dd><p>Show the build configuration, one option per line.
</p>
</dd>
<dt><samp class="option">-formats</samp></dt>
<dd><p>Show available formats (including devices).
</p>
</dd>
<dt><samp class="option">-demuxers</samp></dt>
<dd><p>Show available demuxers.
</p>
</dd>
<dt><samp class="option">-muxers</samp></dt>
<dd><p>Show available muxers.
</p>
</dd>
<dt><samp class="option">-devices</samp></dt>
<dd><p>Show available devices.
</p>
</dd>
<dt><samp class="option">-codecs</samp></dt>
<dd><p>Show all codecs known to libavcodec.
</p>
<p>Note that the term ’codec’ is used throughout this documentation as a shortcut
for what is more correctly called a media bitstream format.
</p>
</dd>
<dt><samp class="option">-decoders</samp></dt>
<dd><p>Show available decoders.
</p>
</dd>
<dt><samp class="option">-encoders</samp></dt>
<dd><p>Show all available encoders.
</p>
</dd>
<dt><samp class="option">-bsfs</samp></dt>
<dd><p>Show available bitstream filters.
</p>
</dd>
<dt><samp class="option">-protocols</samp></dt>
<dd><p>Show available protocols.
</p>
</dd>
<dt><samp class="option">-filters</samp></dt>
<dd><p>Show available libavfilter filters.
</p>
</dd>
<dt><samp class="option">-pix_fmts</samp></dt>
<dd><p>Show available pixel formats.
</p>
</dd>
<dt><samp class="option">-sample_fmts</samp></dt>
<dd><p>Show available sample formats.
</p>
</dd>
<dt><samp class="option">-layouts</samp></dt>
<dd><p>Show channel names and standard channel layouts.
</p>
</dd>
<dt><samp class="option">-dispositions</samp></dt>
<dd><p>Show stream dispositions.
</p>
</dd>
<dt><samp class="option">-colors</samp></dt>
<dd><p>Show recognized color names.
</p>
</dd>
<dt><samp class="option">-sources <var class="var">device</var>[,<var class="var">opt1</var>=<var class="var">val1</var>[,<var class="var">opt2</var>=<var class="var">val2</var>]...]</samp></dt>
<dd><p>Show autodetected sources of the input device.
Some devices may provide system-dependent source names that cannot be autodetected.
The returned list cannot be assumed to be always complete.
</p><div class="example">
<pre class="example-preformatted">ffmpeg -sources pulse,server=192.168.0.4
</pre></div>
</dd>
<dt><samp class="option">-sinks <var class="var">device</var>[,<var class="var">opt1</var>=<var class="var">val1</var>[,<var class="var">opt2</var>=<var class="var">val2</var>]...]</samp></dt>
<dd><p>Show autodetected sinks of the output device.
Some devices may provide system-dependent sink names that cannot be autodetected.
The returned list cannot be assumed to be always complete.
</p><div class="example">
<pre class="example-preformatted">ffmpeg -sinks pulse,server=192.168.0.4
</pre></div>
</dd>
<dt><samp class="option">-loglevel [<var class="var">flags</var>+]<var class="var">loglevel</var> | -v [<var class="var">flags</var>+]<var class="var">loglevel</var></samp></dt>
<dd><p>Set logging level and flags used by the library.
</p>
<p>The optional <var class="var">flags</var> prefix can consist of the following values:
</p><dl class="table">
<dt>‘<samp class="samp">repeat</samp>’</dt>
<dd><p>Indicates that repeated log output should not be compressed to the first line
and the "Last message repeated n times" line will be omitted.
</p></dd>
<dt>‘<samp class="samp">level</samp>’</dt>
<dd><p>Indicates that log output should add a <code class="code">[level]</code> prefix to each message
line. This can be used as an alternative to log coloring, e.g. when dumping the
log to file.
</p></dd>
<dt>‘<samp class="samp">time</samp>’</dt>
<dd><p>Indicates that log lines should be prefixed with time information.
</p></dd>
<dt>‘<samp class="samp">datetime</samp>’</dt>
<dd><p>Indicates that log lines should be prefixed with date and time information.
</p></dd>
</dl>
<p>Flags can also be used alone by adding a ’+’/’-’ prefix to set/reset a single
flag without affecting other <var class="var">flags</var> or changing <var class="var">loglevel</var>. When
setting both <var class="var">flags</var> and <var class="var">loglevel</var>, a ’+’ separator is expected
between the last <var class="var">flags</var> value and before <var class="var">loglevel</var>.
</p>
<p><var class="var">loglevel</var> is a string or a number containing one of the following values:
</p><dl class="table">
<dt>‘<samp class="samp">quiet, -8</samp>’</dt>
<dd><p>Show nothing at all; be silent.
</p></dd>
<dt>‘<samp class="samp">panic, 0</samp>’</dt>
<dd><p>Only show fatal errors which could lead the process to crash, such as
an assertion failure. This is not currently used for anything.
</p></dd>
<dt>‘<samp class="samp">fatal, 8</samp>’</dt>
<dd><p>Only show fatal errors. These are errors after which the process absolutely
cannot continue.
</p></dd>
<dt>‘<samp class="samp">error, 16</samp>’</dt>
<dd><p>Show all errors, including ones which can be recovered from.
</p></dd>
<dt>‘<samp class="samp">warning, 24</samp>’</dt>
<dd><p>Show all warnings and errors. Any message related to possibly
incorrect or unexpected events will be shown.
</p></dd>
<dt>‘<samp class="samp">info, 32</samp>’</dt>
<dd><p>Show informative messages during processing. This is in addition to
warnings and errors. This is the default value.
</p></dd>
<dt>‘<samp class="samp">verbose, 40</samp>’</dt>
<dd><p>Same as <code class="code">info</code>, except more verbose.
</p></dd>
<dt>‘<samp class="samp">debug, 48</samp>’</dt>
<dd><p>Show everything, including debugging information.
</p></dd>
<dt>‘<samp class="samp">trace, 56</samp>’</dt>
</dl>
<p>For example to enable repeated log output, add the <code class="code">level</code> prefix, and set
<var class="var">loglevel</var> to <code class="code">verbose</code>:
</p><div class="example">
<pre class="example-preformatted">ffmpeg -loglevel repeat+level+verbose -i input output
</pre></div>
<p>Another example that enables repeated log output without affecting current
state of <code class="code">level</code> prefix flag or <var class="var">loglevel</var>:
</p><div class="example">
<pre class="example-preformatted">ffmpeg [...] -loglevel +repeat
</pre></div>
<p>By default the program logs to stderr. If coloring is supported by the
terminal, colors are used to mark errors and warnings. Log coloring
can be disabled setting the environment variable
<code class="env">AV_LOG_FORCE_NOCOLOR</code>, or can be forced setting
the environment variable <code class="env">AV_LOG_FORCE_COLOR</code>.
</p>
</dd>
<dt><samp class="option">-report</samp></dt>
<dd><p>Dump full command line and log output to a file named
<code class="code"><var class="var">program</var>-<var class="var">YYYYMMDD</var>-<var class="var">HHMMSS</var>.log</code> in the current
directory.
This file can be useful for bug reports.
It also implies <code class="code">-loglevel debug</code>.
</p>
<p>Setting the environment variable <code class="env">FFREPORT</code> to any value has the
same effect. If the value is a ’:’-separated key=value sequence, these
options will affect the report; option values must be escaped if they
contain special characters or the options delimiter ’:’ (see the
“Quoting and escaping” section in the ffmpeg-utils manual).
</p>
<p>The following options are recognized:
</p><dl class="table">
<dt><samp class="option">file</samp></dt>
<dd><p>set the file name to use for the report; <code class="code">%p</code> is expanded to the name
of the program, <code class="code">%t</code> is expanded to a timestamp, <code class="code">%%</code> is expanded
to a plain <code class="code">%</code>
</p></dd>
<dt><samp class="option">level</samp></dt>
<dd><p>set the log verbosity level using a numerical value (see <code class="code">-loglevel</code>).
</p></dd>
</dl>
<p>For example, to output a report to a file named <samp class="file">ffreport.log</samp>
using a log level of <code class="code">32</code> (alias for log level <code class="code">info</code>):
</p>
<div class="example">
<pre class="example-preformatted">FFREPORT=file=ffreport.log:level=32 ffmpeg -i input output
</pre></div>
<p>Errors in parsing the environment variable are not fatal, and will not
appear in the report.
</p>
</dd>
<dt><samp class="option">-hide_banner</samp></dt>
<dd><p>Suppress printing banner.
</p>
<p>All FFmpeg tools will normally show a copyright notice, build options
and library versions. This option can be used to suppress printing
this information.
</p>
</dd>
<dt><samp class="option">-cpuflags flags (<em class="emph">global</em>)</samp></dt>
<dd><p>Allows setting and clearing cpu flags. This option is intended
for testing. Do not use it unless you know what you’re doing.
</p><div class="example">
<pre class="example-preformatted">ffmpeg -cpuflags -sse+mmx ...
ffmpeg -cpuflags mmx ...
ffmpeg -cpuflags 0 ...
</pre></div>
<p>Possible flags for this option are:
</p><dl class="table">
<dt>‘<samp class="samp">x86</samp>’</dt>
<dd><dl class="table">
<dt>‘<samp class="samp">mmx</samp>’</dt>
<dt>‘<samp class="samp">mmxext</samp>’</dt>
<dt>‘<samp class="samp">sse</samp>’</dt>
<dt>‘<samp class="samp">sse2</samp>’</dt>
<dt>‘<samp class="samp">sse2slow</samp>’</dt>
<dt>‘<samp class="samp">sse3</samp>’</dt>
<dt>‘<samp class="samp">sse3slow</samp>’</dt>
<dt>‘<samp class="samp">ssse3</samp>’</dt>
<dt>‘<samp class="samp">atom</samp>’</dt>
<dt>‘<samp class="samp">sse4.1</samp>’</dt>
<dt>‘<samp class="samp">sse4.2</samp>’</dt>
<dt>‘<samp class="samp">avx</samp>’</dt>
<dt>‘<samp class="samp">avx2</samp>’</dt>
<dt>‘<samp class="samp">xop</samp>’</dt>
<dt>‘<samp class="samp">fma3</samp>’</dt>
<dt>‘<samp class="samp">fma4</samp>’</dt>
<dt>‘<samp class="samp">3dnow</samp>’</dt>
<dt>‘<samp class="samp">3dnowext</samp>’</dt>
<dt>‘<samp class="samp">bmi1</samp>’</dt>
<dt>‘<samp class="samp">bmi2</samp>’</dt>
<dt>‘<samp class="samp">cmov</samp>’</dt>
</dl>
</dd>
<dt>‘<samp class="samp">ARM</samp>’</dt>
<dd><dl class="table">
<dt>‘<samp class="samp">armv5te</samp>’</dt>
<dt>‘<samp class="samp">armv6</samp>’</dt>
<dt>‘<samp class="samp">armv6t2</samp>’</dt>
<dt>‘<samp class="samp">vfp</samp>’</dt>
<dt>‘<samp class="samp">vfpv3</samp>’</dt>
<dt>‘<samp class="samp">neon</samp>’</dt>
<dt>‘<samp class="samp">setend</samp>’</dt>
</dl>
</dd>
<dt>‘<samp class="samp">AArch64</samp>’</dt>
<dd><dl class="table">
<dt>‘<samp class="samp">armv8</samp>’</dt>
<dt>‘<samp class="samp">vfp</samp>’</dt>
<dt>‘<samp class="samp">neon</samp>’</dt>
</dl>
</dd>
<dt>‘<samp class="samp">PowerPC</samp>’</dt>
<dd><dl class="table">
<dt>‘<samp class="samp">altivec</samp>’</dt>
</dl>
</dd>
<dt>‘<samp class="samp">Specific Processors</samp>’</dt>
<dd><dl class="table">
<dt>‘<samp class="samp">pentium2</samp>’</dt>
<dt>‘<samp class="samp">pentium3</samp>’</dt>
<dt>‘<samp class="samp">pentium4</samp>’</dt>
<dt>‘<samp class="samp">k6</samp>’</dt>
<dt>‘<samp class="samp">k62</samp>’</dt>
<dt>‘<samp class="samp">athlon</samp>’</dt>
<dt>‘<samp class="samp">athlonxp</samp>’</dt>
<dt>‘<samp class="samp">k8</samp>’</dt>
</dl>
</dd>
</dl>
</dd>
<dt><samp class="option">-cpucount <var class="var">count</var> (<em class="emph">global</em>)</samp></dt>
<dd><p>Override detection of CPU count. This option is intended
for testing. Do not use it unless you know what you’re doing.
</p><div class="example">
<pre class="example-preformatted">ffmpeg -cpucount 2
</pre></div>
</dd>
<dt><samp class="option">-max_alloc <var class="var">bytes</var></samp></dt>
<dd><p>Set the maximum size limit for allocating a block on the heap by ffmpeg’s
family of malloc functions. Exercise <strong class="strong">extreme caution</strong> when using
this option. Don’t use if you do not understand the full consequence of doing so.
Default is INT_MAX.
</p></dd>
</dl>
<a name="AVOptions"></a>
<h3 class="section">3.3 AVOptions<span class="pull-right"><a class="anchor hidden-xs" href="#AVOptions" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-AVOptions" aria-hidden="true">TOC</a></span></h3>
<p>These options are provided directly by the libavformat, libavdevice and
libavcodec libraries. To see the list of available AVOptions, use the
<samp class="option">-help</samp> option. They are separated into two categories:
</p><dl class="table">
<dt><samp class="option">generic</samp></dt>
<dd><p>These options can be set for any container, codec or device. Generic options
are listed under AVFormatContext options for containers/devices and under
AVCodecContext options for codecs.
</p></dd>
<dt><samp class="option">private</samp></dt>
<dd><p>These options are specific to the given container, device or codec. Private
options are listed under their corresponding containers/devices/codecs.
</p></dd>
</dl>
<p>For example to write an ID3v2.3 header instead of a default ID3v2.4 to
an MP3 file, use the <samp class="option">id3v2_version</samp> private option of the MP3
muxer:
</p><div class="example">
<pre class="example-preformatted">ffmpeg -i input.flac -id3v2_version 3 out.mp3
</pre></div>
<p>All codec AVOptions are per-stream, and thus a stream specifier
should be attached to them:
</p><div class="example">
<pre class="example-preformatted">ffmpeg -i multichannel.mxf -map 0:v:0 -map 0:a:0 -map 0:a:0 -c:a:0 ac3 -b:a:0 640k -ac:a:1 2 -c:a:1 aac -b:2 128k out.mp4
</pre></div>
<p>In the above example, a multichannel audio stream is mapped twice for output.
The first instance is encoded with codec ac3 and bitrate 640k.
The second instance is downmixed to 2 channels and encoded with codec aac. A bitrate of 128k is specified for it using
absolute index of the output stream.
</p>
<p>Note: the <samp class="option">-nooption</samp> syntax cannot be used for boolean
AVOptions, use <samp class="option">-option 0</samp>/<samp class="option">-option 1</samp>.
</p>
<p>Note: the old undocumented way of specifying per-stream AVOptions by
prepending v/a/s to the options name is now obsolete and will be
removed soon.
</p>
<a name="Main-options"></a>
<h3 class="section">3.4 Main options<span class="pull-right"><a class="anchor hidden-xs" href="#Main-options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Main-options" aria-hidden="true">TOC</a></span></h3>
<dl class="table">
<dt><samp class="option">-x <var class="var">width</var></samp></dt>
<dd><p>Force displayed width.
</p></dd>
<dt><samp class="option">-y <var class="var">height</var></samp></dt>
<dd><p>Force displayed height.
</p></dd>
<dt><samp class="option">-fs</samp></dt>
<dd><p>Start in fullscreen mode.
</p></dd>
<dt><samp class="option">-an</samp></dt>
<dd><p>Disable audio.
</p></dd>
<dt><samp class="option">-vn</samp></dt>
<dd><p>Disable video.
</p></dd>
<dt><samp class="option">-sn</samp></dt>
<dd><p>Disable subtitles.
</p></dd>
<dt><samp class="option">-ss <var class="var">pos</var></samp></dt>
<dd><p>Seek to <var class="var">pos</var>. Note that in most formats it is not possible to seek
exactly, so <code class="command">ffplay</code> will seek to the nearest seek point to
<var class="var">pos</var>.
</p>
<p><var class="var">pos</var> must be a time duration specification,
see <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">the Time duration section in the ffmpeg-utils(1) manual</a>.
</p></dd>
<dt><samp class="option">-t <var class="var">duration</var></samp></dt>
<dd><p>Play <var class="var">duration</var> seconds of audio/video.
</p>
<p><var class="var">duration</var> must be a time duration specification,
see <a data-manual="ffmpeg-utils" href="ffmpeg-utils.html#time-duration-syntax">the Time duration section in the ffmpeg-utils(1) manual</a>.
</p></dd>
<dt><samp class="option">-bytes</samp></dt>
<dd><p>Seek by bytes.
</p></dd>
<dt><samp class="option">-seek_interval</samp></dt>
<dd><p>Set custom interval, in seconds, for seeking using left/right keys. Default is 10 seconds.
</p></dd>
<dt><samp class="option">-nodisp</samp></dt>
<dd><p>Disable graphical display.
</p></dd>
<dt><samp class="option">-noborder</samp></dt>
<dd><p>Borderless window.
</p></dd>
<dt><samp class="option">-alwaysontop</samp></dt>
<dd><p>Window always on top. Available on: X11 with SDL >= 2.0.5, Windows SDL >= 2.0.6.
</p></dd>
<dt><samp class="option">-volume</samp></dt>
<dd><p>Set the startup volume. 0 means silence, 100 means no volume reduction or
amplification. Negative values are treated as 0, values above 100 are treated
as 100.
</p></dd>
<dt><samp class="option">-f <var class="var">fmt</var></samp></dt>
<dd><p>Force format.
</p></dd>
<dt><samp class="option">-window_title <var class="var">title</var></samp></dt>
<dd><p>Set window title (default is the input filename).
</p></dd>
<dt><samp class="option">-left <var class="var">title</var></samp></dt>
<dd><p>Set the x position for the left of the window (default is a centered window).
</p></dd>
<dt><samp class="option">-top <var class="var">title</var></samp></dt>
<dd><p>Set the y position for the top of the window (default is a centered window).
</p></dd>
<dt><samp class="option">-loop <var class="var">number</var></samp></dt>
<dd><p>Loops movie playback <number> times. 0 means forever.
</p></dd>
<dt><samp class="option">-showmode <var class="var">mode</var></samp></dt>
<dd><p>Set the show mode to use.
Available values for <var class="var">mode</var> are:
</p><dl class="table">
<dt>‘<samp class="samp">0, video</samp>’</dt>
<dd><p>show video
</p></dd>
<dt>‘<samp class="samp">1, waves</samp>’</dt>
<dd><p>show audio waves
</p></dd>
<dt>‘<samp class="samp">2, rdft</samp>’</dt>
<dd><p>show audio frequency band using RDFT ((Inverse) Real Discrete Fourier Transform)
</p></dd>
</dl>
<p>Default value is "video", if video is not present or cannot be played
"rdft" is automatically selected.
</p>
<p>You can interactively cycle through the available show modes by
pressing the key <kbd class="key">w</kbd>.
</p>
</dd>
<dt><samp class="option">-vf <var class="var">filtergraph</var></samp></dt>
<dd><p>Create the filtergraph specified by <var class="var">filtergraph</var> and use it to
filter the video stream.
</p>
<p><var class="var">filtergraph</var> is a description of the filtergraph to apply to
the stream, and must have a single video input and a single video
output. In the filtergraph, the input is associated to the label
<code class="code">in</code>, and the output to the label <code class="code">out</code>. See the
ffmpeg-filters manual for more information about the filtergraph
syntax.
</p>
<p>You can specify this parameter multiple times and cycle through the specified
filtergraphs along with the show modes by pressing the key <kbd class="key">w</kbd>.
</p>
</dd>
<dt><samp class="option">-af <var class="var">filtergraph</var></samp></dt>
<dd><p><var class="var">filtergraph</var> is a description of the filtergraph to apply to
the input audio.
Use the option "-filters" to show all the available filters (including
sources and sinks).
</p>
</dd>
<dt><samp class="option">-i <var class="var">input_url</var></samp></dt>
<dd><p>Read <var class="var">input_url</var>.
</p></dd>
</dl>
<a name="Advanced-options"></a>
<h3 class="section">3.5 Advanced options<span class="pull-right"><a class="anchor hidden-xs" href="#Advanced-options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Advanced-options" aria-hidden="true">TOC</a></span></h3>
<dl class="table">
<dt><samp class="option">-stats</samp></dt>
<dd><p>Print several playback statistics, in particular show the stream
duration, the codec parameters, the current position in the stream and
the audio/video synchronisation drift. It is shown by default, unless the
log level is lower than <code class="code">info</code>. Its display can be forced by manually
specifying this option. To disable it, you need to specify <code class="code">-nostats</code>.
</p>
</dd>
<dt><samp class="option">-fast</samp></dt>
<dd><p>Non-spec-compliant optimizations.
</p></dd>
<dt><samp class="option">-genpts</samp></dt>
<dd><p>Generate pts.
</p></dd>
<dt><samp class="option">-sync <var class="var">type</var></samp></dt>
<dd><p>Set the master clock to audio (<code class="code">type=audio</code>), video
(<code class="code">type=video</code>) or external (<code class="code">type=ext</code>). Default is audio. The
master clock is used to control audio-video synchronization. Most media
players use audio as master clock, but in some cases (streaming or high
quality broadcast) it is necessary to change that. This option is mainly
used for debugging purposes.
</p></dd>
<dt><samp class="option">-ast <var class="var">audio_stream_specifier</var></samp></dt>
<dd><p>Select the desired audio stream using the given stream specifier. The stream
specifiers are described in the <a class="ref" href="#Stream-specifiers">Stream specifiers</a> chapter. If this option
is not specified, the "best" audio stream is selected in the program of the
already selected video stream.
</p></dd>
<dt><samp class="option">-vst <var class="var">video_stream_specifier</var></samp></dt>
<dd><p>Select the desired video stream using the given stream specifier. The stream
specifiers are described in the <a class="ref" href="#Stream-specifiers">Stream specifiers</a> chapter. If this option
is not specified, the "best" video stream is selected.
</p></dd>
<dt><samp class="option">-sst <var class="var">subtitle_stream_specifier</var></samp></dt>
<dd><p>Select the desired subtitle stream using the given stream specifier. The stream
specifiers are described in the <a class="ref" href="#Stream-specifiers">Stream specifiers</a> chapter. If this option
is not specified, the "best" subtitle stream is selected in the program of the
already selected video or audio stream.
</p></dd>
<dt><samp class="option">-autoexit</samp></dt>
<dd><p>Exit when video is done playing.
</p></dd>
<dt><samp class="option">-exitonkeydown</samp></dt>
<dd><p>Exit if any key is pressed.
</p></dd>
<dt><samp class="option">-exitonmousedown</samp></dt>
<dd><p>Exit if any mouse button is pressed.
</p>
</dd>
<dt><samp class="option">-codec:<var class="var">media_specifier</var> <var class="var">codec_name</var></samp></dt>
<dd><p>Force a specific decoder implementation for the stream identified by
<var class="var">media_specifier</var>, which can assume the values <code class="code">a</code> (audio),
<code class="code">v</code> (video), and <code class="code">s</code> subtitle.
</p>
</dd>
<dt><samp class="option">-acodec <var class="var">codec_name</var></samp></dt>
<dd><p>Force a specific audio decoder.
</p>
</dd>
<dt><samp class="option">-vcodec <var class="var">codec_name</var></samp></dt>
<dd><p>Force a specific video decoder.
</p>
</dd>
<dt><samp class="option">-scodec <var class="var">codec_name</var></samp></dt>
<dd><p>Force a specific subtitle decoder.
</p>
</dd>
<dt><samp class="option">-autorotate</samp></dt>
<dd><p>Automatically rotate the video according to file metadata. Enabled by
default, use <samp class="option">-noautorotate</samp> to disable it.
</p>
</dd>
<dt><samp class="option">-framedrop</samp></dt>
<dd><p>Drop video frames if video is out of sync. Enabled by default if the master
clock is not set to video. Use this option to enable frame dropping for all
master clock sources, use <samp class="option">-noframedrop</samp> to disable it.
</p>
</dd>
<dt><samp class="option">-infbuf</samp></dt>
<dd><p>Do not limit the input buffer size, read as much data as possible from the
input as soon as possible. Enabled by default for realtime streams, where data
may be dropped if not read in time. Use this option to enable infinite buffers
for all inputs, use <samp class="option">-noinfbuf</samp> to disable it.
</p>
</dd>
<dt><samp class="option">-filter_threads <var class="var">nb_threads</var></samp></dt>
<dd><p>Defines how many threads are used to process a filter pipeline. Each pipeline
will produce a thread pool with this many threads available for parallel
processing. The default is 0 which means that the thread count will be
determined by the number of available CPUs.
</p>
</dd>
<dt><samp class="option">-enable_vulkan</samp></dt>
<dd><p>Use vulkan renderer rather than SDL builtin renderer. Depends on libplacebo.
</p>
</dd>
<dt><samp class="option">-vulkan_params</samp></dt>
<dd>
<p>Vulkan configuration using a list of <var class="var">key</var>=<var class="var">value</var> pairs separated by
":".
</p>
</dd>
<dt><samp class="option">-hwaccel</samp></dt>
<dd><p>Use HW accelerated decoding. Enable this option will enable vulkan renderer
automatically.
</p>
</dd>
</dl>
<a name="While-playing"></a>
<h3 class="section">3.6 While playing<span class="pull-right"><a class="anchor hidden-xs" href="#While-playing" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-While-playing" aria-hidden="true">TOC</a></span></h3>
<dl class="table">
<dt><kbd class="key">q, ESC</kbd></dt>
<dd><p>Quit.
</p>
</dd>
<dt><kbd class="key">f</kbd></dt>
<dd><p>Toggle full screen.
</p>
</dd>
<dt><kbd class="key">p, SPC</kbd></dt>
<dd><p>Pause.
</p>
</dd>
<dt><kbd class="key">m</kbd></dt>
<dd><p>Toggle mute.
</p>
</dd>
<dt><kbd class="key">9, 0</kbd></dt>
<dt><kbd class="key">/, *</kbd></dt>
<dd><p>Decrease and increase volume respectively.
</p>
</dd>
<dt><kbd class="key">a</kbd></dt>
<dd><p>Cycle audio channel in the current program.
</p>
</dd>
<dt><kbd class="key">v</kbd></dt>
<dd><p>Cycle video channel.
</p>
</dd>
<dt><kbd class="key">t</kbd></dt>
<dd><p>Cycle subtitle channel in the current program.
</p>
</dd>
<dt><kbd class="key">c</kbd></dt>
<dd><p>Cycle program.
</p>
</dd>
<dt><kbd class="key">w</kbd></dt>
<dd><p>Cycle video filters or show modes.
</p>
</dd>
<dt><kbd class="key">s</kbd></dt>
<dd><p>Step to the next frame.
</p>
<p>Pause if the stream is not already paused, step to the next video
frame, and pause.
</p>
</dd>
<dt><kbd class="key">left/right</kbd></dt>
<dd><p>Seek backward/forward 10 seconds.
</p>
</dd>
<dt><kbd class="key">down/up</kbd></dt>
<dd><p>Seek backward/forward 1 minute.
</p>
</dd>
<dt><kbd class="key">page down/page up</kbd></dt>
<dd><p>Seek to the previous/next chapter.
or if there are no chapters
Seek backward/forward 10 minutes.
</p>
</dd>
<dt><kbd class="key">right mouse click</kbd></dt>
<dd><p>Seek to percentage in file corresponding to fraction of width.
</p>
</dd>
<dt><kbd class="key">left mouse double-click</kbd></dt>
<dd><p>Toggle full screen.
</p>
</dd>
</dl>
<a name="See-Also"></a>
<h2 class="chapter">4 See Also<span class="pull-right"><a class="anchor hidden-xs" href="#See-Also" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-See-Also" aria-hidden="true">TOC</a></span></h2>
<p><a class="url" href="ffplay-all.html">ffmpeg-all</a>,
<a class="url" href="ffmpeg.html">ffmpeg</a>, <a class="url" href="ffprobe.html">ffprobe</a>,
<a class="url" href="ffmpeg-utils.html">ffmpeg-utils</a>,
<a class="url" href="ffmpeg-scaler.html">ffmpeg-scaler</a>,
<a class="url" href="ffmpeg-resampler.html">ffmpeg-resampler</a>,
<a class="url" href="ffmpeg-codecs.html">ffmpeg-codecs</a>,
<a class="url" href="ffmpeg-bitstream-filters.html">ffmpeg-bitstream-filters</a>,
<a class="url" href="ffmpeg-formats.html">ffmpeg-formats</a>,
<a class="url" href="ffmpeg-devices.html">ffmpeg-devices</a>,
<a class="url" href="ffmpeg-protocols.html">ffmpeg-protocols</a>,
<a class="url" href="ffmpeg-filters.html">ffmpeg-filters</a>
</p>
<a name="Authors"></a>
<h2 class="chapter">5 Authors<span class="pull-right"><a class="anchor hidden-xs" href="#Authors" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Authors" aria-hidden="true">TOC</a></span></h2>
<p>The FFmpeg developers.
</p>
<p>For details about the authorship, see the Git history of the project
(https://git.ffmpeg.org/ffmpeg), e.g. by typing the command
<code class="command">git log</code> in the FFmpeg source directory, or browsing the
online repository at <a class="url" href="https://git.ffmpeg.org/ffmpeg">https://git.ffmpeg.org/ffmpeg</a>.
</p>
<p>Maintainers for the specific components are listed in the file
<samp class="file">MAINTAINERS</samp> in the source code tree.
</p>
<p style="font-size: small;">
This document was generated using <a class="uref" href="https://www.gnu.org/software/texinfo/"><em class="emph">makeinfo</em></a>.
</p>
</div>
</body>
</html>
|