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

Paul B Mahol onemda at gmail.com
Sat Aug 19 17:15:02 EEST 2017

On 8/19/17, Nicolas George <george at nsup.org> wrote:
> Le duodi 2 fructidor, an CCXXV, Paul B Mahol a écrit :
>> Sorry but where is that present? I nowhere can determine exact delay
>> in number of frames versus sine beep.
> In the upper-left corner, you have a microsecond timestamp and a frame
> counter.

That is not delay between blink and beep. But video timestamps.

>> It is not sine but testsrc2 one that would need modification.
> Care to explain? The beep is produced by sine. Why would you want to
> modify testsrc2?

For lipsync one would need to alter so blinks happens at exact same
time as beeps.
Say delay is 10 frames, you modify filter to produce delayed blinks.

>> Why you do not agree? When is actual beep when beating cross appears?
> The beep is when the cross is fully contracted.

That is far for being user friendly and obvious.

> Regards,
> --
>   Nicolas George
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