[FFmpeg-devel] [PATCH] avfilter: add Audio Video Sync Test filter

[Paul B Mahol]

On 8/19/17, Nicolas George <george at nsup.org> wrote:
> Le duodi 2 fructidor, an CCXXV, Paul B Mahol a écrit :
>> So it is. So unless you tell what exactly you mean I can not help you.
>
> My bad.
>
>> testsrc(2) are useless for lipsync testing, when one needs to know
>> exact time something is played in wrong time.
>
> Yes, testsrc alone is not enough. But you did not read carefully enough:
> I mentioned testsrc2+sine. The sine source can optionally generate a
> periodic beep, just like your proposal. I grant you, the duration and
> period of the beep cannot be configured, but that would be easy to add.
> And sine is bit-exact and faster.

And how would you show delay introduced with video source filter?
testsrc(2) does not show anything resembling that.

Look at those youtube videos:
https://www.youtube.com/results?search_query=video+sync