[mythtv] [PATCH] generic libavformat seek support (7)

[Mark Spieth]

heres my updated patch for the new ffmpeg.
found an extra bug in the url_fsize function. basically it couldnt work
before. had to change the interface to url_seek so that it returns an
int64_t as current pos. before it returned an int and 0 always which is a
bit useless =) as a result a couple more files needed tweeks in libavformat.
I took stuff out of ringbuffer seek for seekend and put it in
avformatdecoder instead.
may work better for mpegs now. tried it with all I had.
john, give it a try with your replay tv stuff now. may be better.
should be ok for cvs. commented out instrumentation in utils.c is still
there if that is a problem isaac.
Ill be able to fix any bugs tomorrow that people find.

I am also seeing playback startup hiccups sometimes where it cant seem to
read for at least 10 seconds sometimes but I suspect this is a completely
different problem. tomorrow.
also coming soon is audiosync adjust for those videos with lipsync issues.
cheers
mark
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