[vdr] VDR 1.3.12 buffer optimizations

[Klaus Schmidinger <Klaus.Schmidinger@cadsoft.de>]

Sorry, there's no new version of VDR yet, but I've done some
optimizing on the buffer handling in cRemux, which appears to
avoid buffer overflows when several recordings are done.

A patch against VDR version 1.3.12 can be found at

  ftp://ftp.cadsoft.de/vdr/Developer/vdr-1.3.12-optbuf.diff

Maybe some of you can give this a try and check whether it
enables you to do more recordings on the same device than before.

There still appears to be a problem with the buffering in cTSBuffer,
which I have tried to improve by only reading if there is more
than 10000 bytes of free space in the buffer. I'm still working
in that area...

Klaus