Alsasrc && Appsrc synchronisation problems

[LC]

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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