id stringlengths 15 54 | text stringlengths 3 133k | title stringclasses 1
value |
|---|---|---|
ros_instantiate/Commandline_64.txt | * Only record NUM messages on each topic.
$ rosbag record -l 1000 /chatter | |
ros_instantiate/reading20msgs20from2_20.txt | # Option 1: play back the messages immediately and look at the output in
multiple terminals | |
ros_instantiate/Commandline_171.txt | * Write to directory DIR.
$ rosbag decompress --output-dir=uncompressed *.bag | |
ros_instantiate/reading20msgs20from2_25.txt | real 0m1.003s
user 0m0.620s
sys 0m0.283s | |
ros_instantiate/Commandline_140.txt | ` -h ` , ` --help ` | |
ros_instantiate/pythonapirosbagwrite_0.txt | First time here? Check out the FAQ! | |
ros_instantiate/Commandline_147.txt |
rosbag filter input.bag output.bag "t.to_sec() <= 1284703931.86" | |
ros_instantiate/Commandline_167.txt | * ` decompress <bag-files> `
* Decompress the given bag files.
$ rosbag decompress *.bag | |
ros_instantiate/readmessageshtml_125.txt | © 1994-2024 The MathWorks, Inc. | |
ros_instantiate/readmessageshtml_81.txt | Index of the messages in the rosbag, specified as a [ ` BagSelection `
](bagselection.html) or [ ` rosbagreader ` ](rosbagreader.html) object. | |
ros_instantiate/Commandline_48.txt | * Specify the maximum duration of the recorded bag file.
$ rosbag record --duration=30 /chatter
$ rosbag record --duration=5m /chatter
$ rosbag record --duration=2h /chatter | |
ros_instantiate/reading20msgs20from2_79.txt | Wiki: rosbag/Tutorials/reading msgs from a bag file (last edited 2024-04-16
15:57:36 by [ KatherineScott ](/KatherineScott "KatherineScott @
157.131.162.29\[157.131.162.29\]") ) | |
ros_instantiate/reading20msgs20from2_35.txt | So in our case, the command would be: | |
ros_instantiate/Commandline_77.txt | * ` info <bag-files> `
* Display a summary of the contents of the bag files.
$ rosbag info session*.bag | |
ros_instantiate/reading20msgs20from2_60.txt | ### Example 1: | |
ros_instantiate/pythonapirosbagwrite_63.txt | [ What are rosbag --split and --chunksize useful for? ](/question/363852/what-
are-rosbag-split-and-chunksize-useful-for/) | |
ros_instantiate/readmessageshtml_61.txt | Read messages as a structure. Specify the ` DataFormat ` name-value pair when
reading the messages. Inspect the first structure in the returned cell array
of structures. | |
ros_instantiate/Commandline_131.txt | * Do not load rule files via plugins.
$ rosbag fix -n old.bag repaired.bag | |
ros_instantiate/readmessageshtml_50.txt |
bagselect = rosbag('ex_multiple_topics.bag');
bagselect2 = select(bagselect,'Time',...
[bagselect.StartTime bagselect.StartTime + 1],'Topic','/odom'); | |
ros_instantiate/pythonapirosbagwrite_73.txt | [ 
](http://creativecommons.org/licenses/by-sa/3.0/legalcode) ROS Answers is
licensed under Creative Commons Attribution 3.0 Content on this site is
licensed under a [ Creative Commons Attribution Share Alike 3.0
](http://creativecommons.org/licenses/by-sa/3.0/legal... | |
ros_instantiate/readmessageshtml_116.txt | ### Europe | |
ros_instantiate/Commandline_55.txt | ` --max-splits=MAX_SPLITS ` New in ROS Kinetic | |
ros_instantiate/readmessageshtml_115.txt | * [ América Latina ](https://la.mathworks.com) (Español)
* [ Canada ](https://www.mathworks.com) (English)
* [ United States ](https://www.mathworks.com) (English) | |
ros_instantiate/Commandline_180.txt | ` -h ` , ` --help ` | |
ros_instantiate/Commandline_159.txt | * Force overwriting of backup file it it exists.
$ rosbag compress -f *.bag | |
ros_instantiate/Commandline_88.txt | If you do not want to observe playback timing, the ` -i ` option will playback
all messages from the file as fast as possible. Note that for large files this
will often lead to exceeding your incoming buffers. | |
ros_instantiate/readmessageshtml_73.txt |
bagMsgs2 = select(bagMsgs,...
Time=[bagMsgs.StartTime bagMsgs.StartTime + 1],...
Topic='/odom')
bagMsgs2 =
rosbagreader with properties:
FilePath: '/tmp/Bdoc24a_2528353_1173766/tp199fe096/ros-ex26633229/ex_multiple_topics.bag'
StartTim... | |
ros_instantiate/Commandline_57.txt | ` -b SIZE ` , ` --buffsize=SIZE ` | |
ros_instantiate/Commandline_28.txt | ## rosbag record | |
ros_instantiate/pythonapirosbagwrite_62.txt | ## Related questions | |
ros_instantiate/Commandline_38.txt | * Match topics using regular expressions.
$ rosbag record -e "/(.*)_stereo/(left|right)/image_rect_color" | |
ros_instantiate/readmessageshtml_123.txt | * United States | |
ros_instantiate/Commandline_157.txt | * Write to directory DIR.
$ rosbag compress --output-dir=compressed *.bag | |
ros_instantiate/readmessageshtml_97.txt |
msg = rosmessage("/scan","sensor_msgs/LaserScan","DataFormat","struct")
...
pub = rospublisher("/scan","sensor_msgs/LaserScan","DataFormat","struct") | |
ros_instantiate/reading20msgs20from2_16.txt |
rosbag record --duration=30 --output-name=/tmp/mybagfile.bag \
/topic1 /topic2 /topic3 | |
ros_instantiate/reading20msgs20from2_71.txt |
$ time rg '(key: "GPS|key: "Duration|key: "Minimum)' topics.yaml | sort -V | awk '!seen[$0]++'
key: "Duration of window (s)"
key: "GPS RTK height difference (m)"
key: "GPS RTK horizontal accuracy (m)"
key: "GPS RTK meters east"
key: "GPS RTK mete... | |
ros_instantiate/readmessageshtml_71.txt |
bagMsgs = rosbagreader("ex_multiple_topics.bag")
bagMsgs =
rosbagreader with properties:
FilePath: '/tmp/Bdoc24a_2528353_1173766/tp199fe096/ros-ex26633229/ex_multiple_topics.bag'
StartTime: 201.3400
EndTime: 321.3400
NumMes... | |
ros_instantiate/Commandline_177.txt | ` rosbag reindex ` is a command-line tool for repairing broken bag files (or
bag files recorded prior to ROS version 0.11.) If a bag was not closed cleanly
for any reason, then the index information may be corrupted. Use this tool to
reread the message data and rebuild the index. | |
ros_instantiate/reading20msgs20from2_75.txt | The ` ros_readbagfile ` script, however, takes only **1 min 37 sec** on the
same computer to read the same topic from the same 18 GB bag file! Therefore,
` ros_readbagfile ` is 11.5/(1+37/60) = **~7x faster!** | |
ros_instantiate/Commandline_118.txt | ` -g RULEFILE ` , ` --genrules=RULEFILE ` | |
ros_instantiate/reading20msgs20from2_14.txt | First, you need a bag file. Produce your own by following this tutorial ( [
ROS/Tutorials/Recording and playing back data
](/ROS/Tutorials/Recording%20and%20playing%20back%20data) ). | |
ros_instantiate/pythonapirosbagwrite_79.txt | *[
2021-03-16 15:14:04 -0500
]: 2021-03-16 15:14:04 -0500
*[
2021-03-16 20:04:01 -0500
]: 2021-03-16 20:04:01 -0500
*[
2021-03-17 07:11:23 -0500
]: 2021-03-17 07:11:23 -0500
*[
2021-03-17 08:54:13 -0500
]: 20... | |
ros_instantiate/pythonapirosbagwrite_20.txt | With the library std_msgs I can write standar types like str or unint, but i
don't know how to do it with a custom message. | |
ros_instantiate/readmessageshtml_45.txt | ## Examples | |
ros_instantiate/Commandline_175.txt | * Suppress noncritical messages.
$ rosbag decompress -q *.bag | |
ros_instantiate/pythonapirosbagwrite_51.txt | You may have valid reasons, but it's still unclear to me why a bag is involved
if you don't expect to use ROS. To avoid ROS dependencies, you could
(de)serialize the data yourself or using some other tool to work with a non-
bag format. If you want to use a bag without ROS, you can still do so by
(de)serializeng accord... | |
ros_instantiate/reading20msgs20from2_24.txt |
$ time rosbag info demo.bag
path: demo.bag
version: 2.0
duration: 20.0s
start: Mar 21 2017 19:37:58.00 (1490150278.00)
end: Mar 21 2017 19:38:17.00 (1490150298.00)
size: 696.2 MB
messages: 5390
compression: none [600/600 chunks]
ty... | |
ros_instantiate/Commandline_6.txt | * Immutable Page
* Comments
* [ Info ](/action/info/rosbag/Commandline?action=info)
* [ Attachments ](/action/AttachFile/rosbag/Commandline?action=AttachFile)
* More Actions: Raw Text Print View Render as Docbook Delete Cache \------------------------ Check Spelling Like Pages Local Site Map \-----... | |
ros_instantiate/Commandline_163.txt | * ` --lz4 `
* Use LZ4 to compress data.
$ rosbag compress --lz4 *.bag | |
ros_instantiate/readmessageshtml_0.txt | Skip to content | |
ros_instantiate/Commandline_42.txt | * Publish a message when the record begin to write a new bag (topic = " ` begin_write ` ").
$ rosbag record -p | |
ros_instantiate/readmessageshtml_89.txt | ## Version History | |
ros_instantiate/reading20msgs20from2_10.txt | **Description:** Learn two ways to read messages from desired topics in a bag
file, including using the really handy **ros_readbagfile** script.
**Keywords:** data, rosbag, extract, play, info, bag, messages, readbagfile,
ros_readbagfile
**Tutorial Level:** BEGINNER
**Next Tutorial:** [ Producing filtere... | |
ros_instantiate/pythonapirosbagwrite_41.txt | I didn't actually test this code, so let me know if you run into problems. | |
ros_instantiate/Commandline_126.txt | See more instructions and usage examples on the [ rosbag migration page
](/rosbag/migration#converting) . | |
ros_instantiate/readmessageshtml_86.txt | ### ` msgs ` — ROS message data
object | cell array of message objects | cell array of structures | |
ros_instantiate/Commandline_104.txt | * ` -l ` , ` --loop `
* Loop playback.
$ rosbag play -l recorded1.bag | |
ros_instantiate/reading20msgs20from2_18.txt | The rest of this tutorial will be done assuming you've downloaded the
webviz.io demo bag file using the ` wget ` command as shown above. You will go
through two options to read/extract messages from the bag file. | |
ros_instantiate/readmessageshtml_14.txt | Close Mobile Search | |
ros_instantiate/Commandline_185.txt | * Force overwriting of backup file it it exists.
$ rosbag reindex -f *.bag | |
ros_instantiate/reading20msgs20from2_12.txt | 1. Download or record a bag file
2. Option 1: play back the messages immediately and look at the output in multiple terminals
3. Option 2: use the ros_readbagfile script to easily extract the topics of interest
1. More .yaml file analysis
1. Example 1:
2. Example 2:
4. Why use `ros_readbag... | |
ros_instantiate/Commandline_160.txt | ` -q ` , ` --quiet ` | |
ros_instantiate/Commandline_24.txt | * [ compress ](/rosbag/Commandline#compress)
* Compress one or more bag files. | |
ros_instantiate/Commandline_102.txt | * ` -u SEC ` , ` --duration=SEC `
* Play only SEC seconds from the bag files.
$ rosbag play -u 240 recorded1.bag | |
ros_instantiate/reading20msgs20from2_34.txt | 5. Repeat this process for as many topics as you like. Each topic must have its own terminal.
6. Open up another terminal to play the bag file. We will now play back the bag file as quickly as possible (using the ` --immediate ` option), publishing ONLY the topics of interest. The format is:
time ros... | |
ros_instantiate/Commandline_30.txt | If you are recording messages at a high bandwidth, such as from cameras, it is
strongly recommended you run ` rosbag record ` on the same machine as the
camera, and specify the file destination as being on the local machine disk. | |
ros_instantiate/reading20msgs20from2_36.txt |
time rosbag play --immediate demo.bag --topics /obs1/gps/fix /diagnostics_agg | |
ros_instantiate/pythonapirosbagwrite_70.txt | [ Controlling a quadcopter in Gazebo ](/question/327096/controlling-a-
quadcopter-in-gazebo/) | |
ros_instantiate/pythonapirosbagwrite_57.txt | [ subscribe to rss feed ](/feeds/question/374115/ "subscribe to the rss feed") | |
ros_instantiate/Commandline_100.txt | * ` -r FACTOR ` , ` --rate=FACTOR `
* Multiply the publish rate by FACTOR.
$ rosbag play -r 10 recorded1.bag | |
ros_instantiate/reading20msgs20from2_15.txt | Assuming you are on a system with ROS already running, here is a quick command
to record a 30 second snippet of data into a bag file for just topics you are
interested in, ex: ` /topic1 ` , ` /topic2 ` , and ` /topic3 ` . Since we are
setting a duration of 30 seconds, the recording will automatically stop after
this ti... | |
ros_instantiate/pythonapirosbagwrite_45.txt | Hi again, I understand what you mean but, I want to do it without installing
ROS in mi computer. There is another way to write a custom message without
using ROS? I want to make a program that can write some messages but without
the user having to worry about installing ROS But thanks a lot, I will
continue searching b... | |
ros_instantiate/readmessageshtml_106.txt | ×  | |
ros_instantiate/readmessageshtml_74.txt | Retrieve the messages in the selection as a cell array. | |
ros_instantiate/Commandline_84.txt | _Example usage:_ | |
ros_instantiate/readmessageshtml_44.txt | To use message structures now, set the ` "DataFormat" ` name-value argument to
` "struct" ` . For more information, see [ ROS Message Structures
](readmessages.html#buqn04a_sep_mw_f541fa33-9d06-425c-9f2e-0085cfca490a) . | |
ros_instantiate/Commandline_4.txt | * [ Distributions ](/Distributions)
* [ ROS/Installation ](/ROS/Installation)
* [ ROS/Tutorials ](/ROS/Tutorials)
* [ RecentChanges ](/RecentChanges)
* [ rosbag/Commandline ](/rosbag/Commandline) | |
ros_instantiate/reading20msgs20from2_39.txt | 7. Done! Now go look at your two terminals which were each subsribed to a topic, and you'll see the output of all messages for each topic type, in YAML format, with a ` --- ` line between each message. Use a text editor of your choice, preferably with Syntax Highlighting for YAML file types (ex: Sublime Text 3) to vi... | |
ros_instantiate/pythonapirosbagwrite_53.txt | add a comment | |
ros_instantiate/Commandline_101.txt | * ` -s SEC ` , ` --start=SEC `
* Start SEC seconds into the bags.
$ rosbag play -s 5 recorded1.bag | |
ros_instantiate/Commandline_27.txt | These are described in greater detail in the following sections. | |
ros_instantiate/pythonapirosbagwrite_74.txt | [ about ](/about/) | [ faq ](/faq/) | [ help ](/help/ "help") | [ privacy
policy ](/privacy/) | [ terms of service ](/terms/) | |
ros_instantiate/Commandline_31.txt | * ` record <topic-names> `
* Record a bag file with the contents of the specified topics.
$ rosbag record rosout tf cmd_vel | |
ros_instantiate/Commandline_108.txt | * ` --pause-topics `
* topics to pause on during playback | |
ros_instantiate/readmessageshtml_68.txt | [ Open Live Script
](matlab:openExample\('ros/CreateRosbagSelectionUsingRosbagreaderObjectExample'\)) | |
ros_instantiate/reading20msgs20from2_54.txt | Now view **topics.yaml** with your preferred text editor or viewer (ex:
Sublime Text 4, gedit, emacs, vim, ` less ` , etc) to see all of the messages
it extracted from the bag file. | |
ros_instantiate/Commandline_109.txt | * ` --bags=BAGS `
* bags files to play back from | |
ros_instantiate/Commandline_35.txt | * Record all topics.
$ rosbag record -a | |
ros_instantiate/Commandline_44.txt | * Exclude topics matching the given regular expression (subtracts from ` -a ` or ` -e ` ).
$ rosbag record -e "/wide_stereo(.*)" -x "(.*)/points(.*)" | |
ros_instantiate/readmessageshtml_42.txt | **Note** | |
ros_instantiate/readmessageshtml_47.txt | ### Return ROS Messages as a Cell Array | |
ros_instantiate/Commandline_112.txt | * ` --rate-control-max-delay=RATE_CONTROL_MAX_DELAY `
* maximum time difference from ` <rate-control-topic> ` before pausing | |
ros_instantiate/pythonapirosbagwrite_6.txt | [ __ ](/questions/) | | |
ros_instantiate/reading20msgs20from2_69.txt |
time rg '(key: "GPS|key: "Duration|key: "Minimum)' topics.yaml | sort -V | awk '!seen[$0]++' | |
ros_instantiate/readmessageshtml_9.txt | Help Center | |
ros_instantiate/readmessageshtml_98.txt | In a future release, ROS messages will use structures by default and ROS
message objects will be removed. | |
ros_instantiate/reading20msgs20from2_29.txt | You'll see: | |
ros_instantiate/reading20msgs20from2_51.txt |
watch -n 1 'du -sk topics.yaml | awk '\''{printf "%.3f MiB %s\n", $1/1024, $2}'\''' | |
ros_instantiate/readmessageshtml_49.txt | Read rosbag and filter by topic and time. | |
ros_instantiate/pythonapirosbagwrite_18.txt | The message's format is described in this file [ https://github.com/uzh-
rpg/rpg_dvs_ro... ](https://github.com/uzh-
rpg/rpg_dvs_ros/blob/master/dvs_msgs/msg/Event.msg) |
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