lapoly.blogg.se - Ffmpeg remove audio streams

As far as I can tell from the manual, -c:s copy is supposed to copy all the streams, not just the default one, but it won’t. ffmpeg -i IN.mkv -c:v libx264 -threads 4 -speed 1 -f matroska -c:s copy -map 0:s OUT.mkv Result: No video, no audio, all subtitles. Result: All video, all audio, all subtitles.

To remove subtitle stream without re-encoding video and audio shortest command would be: ffmpeg -i input.mkv -sn -c copy output.mkv How to re-encode video with FFmpeg including all audio? See FFmpeg Wiki: Audio Channels for more examples.How to remove a subtitle stream in FFmpeg? 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.