[FFmpeg-user] Copy Audio

[Gyan]

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