> I believe video players usually use the sound card as timing source, > otherwise they'd have to compensate for the difference between the sound > card's clock and system/graphics clock by resampling the sound.
If you're watching a live broadcast, the video decoding in the TV receiver has to be synchronous with the video encoding TV transmitter. The slightest difference in clock would case video frames to be missed or skipped in the long term. The same clock reference is also used for audio/video synchronisation (lip sync). This is the System Clock Reference/Program Clock Reference mechanism. I thought mplayer uses the sound card timer as System Clock Reference. I assume this is because what is really needed to locally re-create the system clock - a 27 MHz voltage-controlled crystal oscillator - is not generally available on PC hardware. regards, koen> _______________________________________________ Open-graphics mailing list [email protected] http://lists.duskglow.com/mailman/listinfo/open-graphics List service provided by Duskglow Consulting, LLC (www.duskglow.com)
