[FFmpeg-user] libvpx + libopus creates files with negative starttime for audio

Def Etienne shaker.doc at gmail.com
Sat Sep 4 20:37:58 EEST 2021

Sent from my iPhone

> On 4 Sep 2021, at 14:16, Mike Martin <redtux1 at gmail.com> wrote:
> Hi
> I have come across an oddity with transcoding files to vp9/libopus from mp4
> The resulting files have a negative starttime for audio , nearly all the
> time this is -.007.
> I noticed it when I was concating files using demux concat and specifying
> video duration
> This resulted in concat operation stopping at end of first file.
> Removing the duration from the conf file seems to resolve this.

Could you please give another a chance to replicate this?:
Give the command line and  perhaps the console output. 

> Seems to be just this combination of codecs

More information about the ffmpeg-user mailing list