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This brings the !--on-the-fly-encoding mode up to speed.
The cached file header loses the total_frames counter, as the
capture_frameno already represents this.
Dropped frames are detected by simply looking at the difference
between the previous capture_frameno and the current one. This
simply gets passed to the encoder as a n_frames count so theora
can duplicate the frames as needed.
This was being done manually before by looking at the frameno and
total frames in each header and maintaining separate counts for
"extra frames" "missed frames" etc, and resubmitting entire
frames multiply for encoding dropped frames.
So a chunk of code has been thrown out from rmd_load_cache.c, and
some general cleanups have occurred there as well.
I also needed to add more locking around pdata->avd accesses.
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