ffmpeg:decoding:extract_some_streams
Table of Contents
ffmpeg - Decoding - Extract some streams
Check what streams exist
ffmpeg -i inputfile
returns:
Stream #0:0: Video: hevc ..... Stream #0:1(eng): Audio: aac .... Stream #0:2(eng): Subtitle: ... Stream #0:3(fre): Audio: aac .... Stream #0:4(fre): Subtitle: aac ....
Extract some streams
ffmpeg -i inputfile.mkv -map 0:0 -map 0:1 -map 0:2 -c:v libx264 -preset fast -crf 25 -c:a copy -c:s copy english-output.mp4
NOTE: This extracts only the Video, English audio and Subtitles; but encodes the video (fast crf 25):
- Processing what you mapped is done sequentially.
- -map 0:0 is the Video stream; because the -c:v is the first action and therefore goes to this 1st mapping.
- -map 0:1 is the Audio stream, because the -c:a copy is the second action and therefore goes to this 2nd mapping.
- -map 0:2 is the Subtitles stream, because the -c:s copy is the third action and therefore goes to this 3rd mapping.
- There are shortcuts too, that could be used:
- -map 0:v selects all the video type streams.
- -map 0:a selects all the audio type streams.
ffmpeg/decoding/extract_some_streams.txt · Last modified: 2023/11/02 23:03 by peter