On 19-12-2018 09:51 AM, Chris wrote:
The original audio is:
ID : 2
Format : PCM
Format settings : Big / Signed
Codec ID : twos
Duration : 1 min 42 s
Bit rate mode : Constant
Bit rate : 1 536 kb/s
Channel(s) : 2 channels
Sampling rate : 48.0 kHz
Bit depth : 16 bits
This is writing invalid files. mp4 does not allow pcm_s16be.
That is the audio ffmpeg is being told to copy. In v 4.0 it successfully copies
the audio which can then be played back.
In v 4.1 it does not copy the audio but rather throws errors.
Changed by commit 4cfb01d6ae5 : lavf/movenc: Fail when codec tag is
invalid for format
FWIW, PCM audio isn't allowed in MP4, only MOV, see
http://mp4ra.org/#/codecs
It was a regression in ffmpeg 3.4 - 40 that allowed this.
Gyan
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