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I'm having trouble getting ffmpeg to copy all audio streams from a .mp4 file. 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 in.mp4 contains 3 streams:
out.mp4 (which should be identical to in.mp4) contains only 2 streams:
FFmpeg does appear to correctly identify all 3 streams, but doesn't copy all of them over. Output from FFmpeg:
Stream mapping: Stream #0:0 -> #0:0 (copy) Stream #0:1 -> #0:1 (copy) Stream #0:2 -> #0:2 (copy) Edit: Output from ffmpeg -v 9 -loglevel 99 -i in.mp4:
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from in.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf57.36.100 Duration: 00:00:06.03, start: 0.000000, bitrate: 5582 kb/s Stream #0:0(und), 1, 1/15360: Video: h264 (Main), 1 reference frame (avc1 / 0x31637661), yuv420p(tv, bt470bg/unknown/unknown, left), 1920x1080 (0x0) [SAR 1: 1 DAR 16:9], 0/1, 5317 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default) Metadata: handler_name : VideoHandler Stream #0:1(und), 1, 1/48000: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default) Metadata: handler_name : SoundHandler Stream #0:2(und), 1, 1/48000: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s Metadata: handler_name : SoundHandler Successfully opened the file. At least one output file must be specified [AVIOContext @ 0000000001c2b9e0] Statistics: 153350 bytes read, 2 seeks Edit 2 (solved): I managed to find the correct syntax from this ticket. For any others that are interested, the correct syntax is:
ffmpeg -i in.mp4 -vcodec copy -c:a copy -map 0 out.mp4
This will copy all streams.
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-map 0 tells ffmpeg to all streams from input 0 (the first input) in the output file. -c:a copy -c:s copy will copy over any audio and subtitle streams present.
ffmpeg has a default stream selection behavior that will select 1 stream per stream type (1 video, 1 audio, 1 subtitle, 1 data).
-c copy copies the first video, audio, and subtitle bitstream from the input to the output file without re-encoding them. This won't harm the quality and make the command run within seconds.
FFmpeg MOV to MP4 (Convert Video/Audio to Another Format) FFmpeg is extremely useful to convert your video file to another format. For example, to convert MOV to MP4 with FFmpeg, run the command below. ffmpeg -i input.mov output.mp4. Similarly, you can transcode audio files with FFmpeg by specifying the output format.
FFmpeg have option to map all streams to output, you have to use option -map 0 to map all streams from input to output.
In full line it might look like:
ffmpeg -i in.mp4 -c copy -map 0 out.mp4 For more info see the documentation on stream selection and the -map option.
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