Tero Siironen wrote:
However, like Pasi Juppo told earlier in other thread, in last weeks episode
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.

Cheers,

Udo

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