Alsasrc && Appsrc synchronisation problems

[Bruce Tsai]

Check PTS of appsrc buffer first is a good start.
If the PTS is created when appsrc buffer is generated, it could be late.
If the PTS is created when you receive need-data signal, this PTS is more likely to catch up alsasrc buffer.

--
Yi-Lung (Bruce) Tsai
wagamama.tsai at gmail.com





> On Apr 14, 2017, at 6:25 AM, LC <lienes.cirules at gmail.com> wrote:
> 
> Hello, 
> 
> I have a problem with alsasrc and appsrc buffer synchronization. I have a
> stream like this: 
> alsasrc ------> flvmux -----> rtmpsink
> appsrc ----------^ 
> 
> I am pushing buffers on appsrc on need-data signal. 
> I make feed to appsrc as much as need-data callback executes.
> The main problems is that after a while of streaming i got sound are
> dis-aligned to image. So that i see the sound should occur on this image but
> actually i hear the image after 1s.  If i stream even more, i got even more
> dis-alignment. 
> 
> I experienced this problem only when sourcing by appsrc element. 
> I am setting appsrc buffer PTS based on stream running time. Anyway i got
> dis-alignment over time.
> After 5min streaming, i got 1s sound dis-alignment.
> 
> What may be the cause of this problem : buffer timestamping on appsrc,
> inconsistent appsrc fps or anything else ? 
> Any help is really important. 
> 
> Thanks in advance!
> 
> 
> 
> 
> --
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