[vdr] FF card AV sync problems, possible fix to VDR

Hi! The newest firmware for FF cards did not completely fix the AV desync problems for me. According to information from Werner the problem happens when small video frames fill the decoder buffer with over 2 seconds of data. So I made this patch for dvbplayer.c to stop it from uploading more

[vdr] FF card AV sync problems, possible fix to VDR (fwd)

Hi! The newest firmware for FF cards did not completely fix the AV desync problems for me. Can you provide a sample recording where A/V sync fails with the current firmware? Oh, well. Turns out that I had somehow failed to install the new firmware properly. My test patch is possibly