[dvblast-devel] PATCH: Avoid jitter in RTP timestamps

[Christophe Massiot]

Hi Marian,

At 7:37 +0200 17/08/09, Marian ëurkoviã wrote:

>    The attached patch fixes this problem by taking reference wallclock
>samples during output phase. This way RTP timestamp always matches PCR
>contained in transmitted IP packet.

I have taken a long time to review this patch. This is because it 
seems fundamentally wrong, when calculating a reference clock, to 
increase the jitter of the incoming PCRs. Taking them in the output 
adds delay due to scheduling and packetization by the DVB layer.

However the problem you raised is real ; I have thought of ways to 
fix it otherwise, but couldn't find a satisfying alternative. It 
would probably involve rewriting the PCRs in the packets, which leads 
to other problems such as VBV violation.

So, here it goes...

-- 
Christophe Massiot.