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.
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