[vdr] bug: Displayed progress of radio recordings is wrong

[Jon Burgess <mplayer@jburgess.uklinux.net>]

I've noticed that VDR progress display for radio recordings is wrong. 
Each second registered in the progress meter is approximately 1.6 real 
seconds, and the total recording length is also effected (a 2:10 hour 
recording displays as 1:20). Overall the effects cancel out so the whole 
recording is played back.

I tracked this down to the code which assumes that there are always 
exactly 25 index marks per second (FRAMESPERSEC). This may be true for 
50Hz TV, but for a radio recording the index marks get written 
differently. The remux code returns the blocks of radio data in chunks 
of 0x800 (2048) bytes, but sometimes there is an odd 0x220 (544) bytes 
as well. For me this works out at about 15 - 16 index's per second.

I tried looking at doing some auto-calibration of the timing based on 
the real playback rate (number of playFrame / s), but the buffering in 
the output device seems to make this measurement far too erratic to be 
useful.

Has anyone got any suggested solutions for this?

Thanks,
	Jon




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