[mythtv] A prelude to transcoding MPEG2->MPEG2

[Derek Atkins]

"Geoffrey Hausheer" <ou401cru02 at sneakemail.com> writes:

> Sure sounds easy doesn't it?  Unfortunately, this is non trivial.  As
> others have mentioned, just chopping to real i-frames is much more
> difficult than it sounds.  Reencdoing will make it harder, becasue you
> need to generate a valid GOP that looks exactly like the other GOPs,
> otherwise you risk compatibility issues.  I think I'll start with
> chopping down to the nearest I-frame, and if that actually works, then
> perhaps we'll try adding a encoder into the mix.
>
> Don't expect anything soon though.  This is not a trivial task (which is
> why it hasn't been done already)

Personally, I'm willing to live with chopping to the nearest GOP.
Usually I'm cutting out 60-300 seconds of crap; I'm willing to live
with 0.5-1 second of leftover in the result.  Also, cutting to the
nearest GOP should make it easier to write to a video DVD, no?

> .Geoff

-derek

-- 
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
       URL: http://web.mit.edu/warlord/    PP-ASEL-IA     N1NWH
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