plecompanion.blogg.se - Ffmpeg remove audio track from mkv

If you don't specify the -t option it will go to the end. The timestamps need to be in HH:MM:SS.xxx format or in seconds. If you want to extract a portion of audio from a video use the -ss option to specify the starting timestamp, and the -t option to specify the encoding duration, eg from 3 minutes and 5 seconds in for 45 seconds: ffmpeg -i sample.avi -ss 00:03:05 -t 00:00:45.0 -q:a 0 -map a sample.mp3 See FFmpeg Wiki: Audio Channels for more examples.To encode a high quality MP3 or MP4 audio from a movie file (eg AVI, MP4, MOV, etc) or audio file (eg WAV), I find it's best to use -q:a 0 for variable bit rate and it's good practice to specify -map a to exclude video/subtitles and only grab audio: ffmpeg -i sample.avi -q:a 0 -map a sample.mp3 See ffmpeg -layouts for a list of accepted channel layouts (for channel_layout option) and channel names (for channels option). The default is all which extracts each input channel as a separate, individual stream. The default is stereo.Ĭhannels lists the channels to be extracted as separate output streams. Example to get the right channel only and output a mono audio file: ffmpeg -i stereo.wav -filter_complex "channelsplit=channel_layout=stereo:channels=FR" -map "" front_right.wavĬhannel_layout is the channel layout of the input stream. Using a stereo input and channelsplit filter.

a - audio, such as -map -0:a (as shown above)Įxtract or remove a specific audio channel.

If you want to remove other stream types you can use the appropriate stream specifier.

ffmpeg -i input -map 0:v -map 0:a -c copy output Removing other stream / track types This example does not need to use any negative mapping. Keep everything except audio streams #4 (at offset 3) and #7 (at offset 6): ffmpeg -i input -map 0 -map -0:a:3 -map -0:a:6 -c copy output Remove all subtitles and data ffmpeg -i input -map 0 -map -0:s -map -0:d -c copy output Only include video and audio -map -0:a then deselects all audio streams from the input.

Remove all audio streams / tracks ffmpeg -i input -map 0 -map -0:a -c copy output The stream index starts counting from 0, so audio stream 10 would be 0:a:9.

-map -0:a:2 then deselects audio stream 3.

-map 0 selects all streams from the input.Remove a specific audio stream / track ffmpeg -i input -map 0 -map -0:a:2 -c copy output The most efficient method is to use negative mapping in the -map option to exclude specific stream(s) ("tracks") while keeping all other streams.