Update ffmpeg.ts

src/lib/ffmpeg.ts

@@ -730,7 +730,7 @@ async function F_build_ffmpeg_command_v1(arg0: {
 
   command.push("-tune", "zerolatency");
   command.push("-crf", "23");
-  command.push("-preset", live === "stream" ? "ultrafast" : "medium");
+  command.push("-preset", live === "stream" ? "ultrafast" : "ultrafast");
   command.push("-pix_fmt", "yuv420p");
   command.push("-c:a", "aac");
   command.push("-b:a", "256k");
@@ -947,7 +947,7 @@ async function F_build_ffmpeg_command_v2(arg0: {
 
   command.addOption("-tune", "zerolatency"); // tells the encoder to minimize the delay between capturing a frame and outputting it
   command.addOption("-crf", "23");
-  command.addOption("-preset", live === "stream" ? "ultrafast" : "medium");
+  command.addOption("-preset", live === "stream" ? "ultrafast" : "ultrafast");
   command.addOption("-pix_fmt", "yuv420p");
   command.addOption("-c:a", "aac");
   command.addOption("-b:a", "256k");
@@ -1321,7 +1321,7 @@ async function F_build_ffmpeg_command_v3(arg0: {
   /* ENCODING & TUNING */
   command.push("-tune", "zerolatency");
   command.push("-crf", "23");
-  command.push("-preset", use_ultrafast ? "ultrafast" : "veryfast"); // veryfast faster medium
+  command.push("-preset", use_ultrafast ? "ultrafast" : "ultrafast"); // veryfast faster medium
   command.push("-pix_fmt", "yuv420p");
   command.push("-max_interleave_delta", "0");