Sent from my iPhone

> On 4 Sep 2021, at 14:16, Mike Martin <redt...@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
> 
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