![]() There are shortcuts too, -map 0:v selects all the video type streams as -map 0:a does for audio type streams. Processing what you mapped is done sequentially, -map 0:0 is the video stream and was my first map so once I had finished mapping the first action was going to be run on this video stream. Keeping only the video, English audio and subtitles however encode the video (fast crf 25): 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 The following code stitches four videos without re-encoding them. Making a French only audio copy with: ffmpeg -i inputfile.mkv -map 0:3 french-audio.mp3 After the file is generated, you can then stitch the listed video with the command we used earlier: ffmpeg -f concat -i videos.txt -c copy output9.mp4 Merge videos with the concat protocol You can also join videos with the concat protocol. It will look something like this: ffmpeg -i originalvideo.mp4 -ss 0:0:4 -t 0:1:10 -vcodec copy -acodec copy outputvideo. ![]() Ī simple FFmpeg map example to create an audio only and then a video only copy from the input: ffmpeg -i inputfile.mkv -map 0:1 audio.mp3 -map 0:0 video.mp4īecause Stream #0:1 is the audio stream and #0:0 is the video stream. To avoid this, you can use the copy codec for audio and video in the corresponding ffmpeg split video command. You will see (depending on your input file) multiple streams, they look like: Stream #0:0: Video: hevc. Run ffmpeg -i inputfile to see all the information about the media. Video usually has different streams for quality when it is a live stream. Streams means video, audio, subtitles, attachments and data within the file this is rather complex on movie files where there could be multiple audio streams for different languages and the same for subtitles. Map in FFmpeg can be best understood as selecting streams within a file you want to encode, keep or remove when creating an output. ![]()
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