[mythtv] New MPEG2 commercial-cut code ready for testing

[Cory Papenfuss]

>
> My main requirement is to remove the flagged sections of the
> data stream, without changing it otherwise. It looks like your
> test tool does the trick.
>
 	Trouble is, sometimes the streams need changing.  The ivtv 
captures from tape are notoriously full of missing video frames which 
break most post-processing programs.  Granted, if the commercials were cut 
out, one could just ignore the timestamp mismatches if the only intent was 
to play the resulting video.  If the goal is to have a cleaned up 
MPEG2->MPEG2 stream as the master copy on the mythbox however, it probably 
needs cleaning.

 	Of course, other things that come more or less for free from this 
are the removal of padding streams in captures (a few percent on some 
captures from what I've seen), remux into more friendly PUs, 
frame-accurate editing, and the possibility of hooking in tcrequant for 
minor bitrate reductions on-the-fly.

 	Lots of potential here once things are cleaned up and easy to work 
with.  Great work so far... this is the closest I've seen to true lossless 
cutting from within mythtv since I realized it wasn't present 18 months 
ago.

-Cory

-- 

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* Cory Papenfuss                                                        *
* Electrical Engineering candidate Ph.D. graduate student               *
* Virginia Polytechnic Institute and State University                   *
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