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For any others that are interested, the correct syntax is:įfmpeg -i in.mp4 -vcodec copy -c:a copy -map 0 out.mp4 Statistics: 153350 bytes read, 2 seeksĮdit 2 (solved): I managed to find the correct syntax from this ticket. Out.mp4 (which should be identical to in.mp4) contains only 2 streams:įFmpeg does appear to correctly identify all 3 streams, but doesn't copy all of them over. After hours of searching online, it appears this should copy all streams ( as shown in example 4 here): ffmpeg -i in.mp4 -map 0 -c copy out.mp4

I'm having trouble getting ffmpeg to copy all audio streams from a.