[vdr] FF card A/V sync suggestion
syphir at syphir.sytes.net
Fri Oct 20 23:22:30 CEST 2006
> Udo Richter wrote:
>> Tero Siironen wrote:
>>> However, like Pasi Juppo told earlier in other thread, in last weeks
>>> of Lost there was many fadeout-fadeins between scenes and a/v desync
>>> happened on every one of these.
>> I've 'heard of such problems' on ATV+ and Lost. Whenever there's a fade
>> into black, the data stream seems to get stuck, frames get delayed, and
>> as consequence A/V desyncs and playback gets jerky, with lots of audio
>> and video frame drops. This can be fixed by pausing and jumping a few
>> frames backwards.
>> My theory is that since audio is typically 600ms ahead of video, maybe
>> the audio buffers run over. Strange thing is why this happens
>> reproducible on blackness. Maybe due to extremely low bit rate in this
>> situation, more frames get packed into one data block, causing data flow
>> to be disturbed beyond some limit. It cant be too high data rate, ATV+
>> has just 2mbit avg, 4mbit max data rate.
> This theory sounds reasonable. Any idea on a way to fix it? The biggest
> question is if it can be fixed from within VDR's source code or if it would
> require an additional firmware/driver revision. I have given up hope on it.
> The only way I know of that is reliable is using software decoding.
But, the biggest question is.. why does the ONLY happen when playing back
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