Could not find tag for codec pcm_alaw in stream #1, codec not currently supported in container when concatenating 2 files using ffmpeg [closed]

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codec not currently supported in container

ffmpeg does not support PCM (pcm_alaw, pcm_s16le, etc) in the MP4 container. Encode the audio as AAC, or use a different output container format such as MOV or MKV.

Encode the audio to AAC

ffmpeg -i input.mov -c:v copy -c:a aac output.mp4

Or output to MOV or MKV

ffmpeg -i input.mp4 -c copy output.mkv

copy enables stream copy mode which only re-muxes and avoids re-encoding (like a copy and paste).

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