[mythtv] [PATCH] MPEG2->MPEG2 commercial cut (myth patch)
jim at jtan.com
Fri Jan 2 21:24:53 EST 2004
> yeah, sorry about that. it works this way because it is faster to do a
> rename nuv->old, tmp->nuv, rm old than to do a rm num, mv tmp->nuv (less
> time when the user could try to watch a recording that is being swapped).
> I don't really plan to change it, so the answer is 'don't do that'
will do the trick just as fast, since rename clobbers the destination.
> Well, that's a good question. Yes I think it should have. However, the
> mpeg2->mpeg2 stuff isn't very robust as far as changing the cutlist while
> processing. I'm not sure when myth actually writes the cutlist back to
> the db, but probably not until you stop watching the recording. So for
> now, you'd need to:
OK, so I tried again on my next recording, this time making sure the
cutlist had been specified for a while before starting transcoding.
This time, it hung: more details at the end...
> > - If it didn't cut the commercials, why did the file shrink?
> Most likely it pruned out bogus audio/video frames. If it was recorded
> with a DVB/HDTV card, then it is probably the TS->PS conversion
This is with a PVR-350, DVD Special-2 mode.
> > - The cut file seems to play OK in mplayer and MythTV, but from
> > within MythTV seeking around is slow, and the total recording time
> > jumps around, getting closer and closer to the actual time (30 mins)
> > as I near the end of the recording. I also can't enter edit-mode
> > anymore.
> well, we don't rebuild the keyframe index yet, so yeah, you'll see this
> for now.
I suppose running mythcommflag or something would fix that for now.
With my next MPEG, it hangs pretty early on. This is again from a
PVR-350, DVD special 2, and it hangs at a point where the MPEG is
probably a bit messy (early on, when my cable box is just switching
The output of
mythtranscode -c 1060 -s 2003-12-14T22:00:00 -p autodetect -d -l
with mp2_debug=2 is attached. I also put the first 600kb of the MPEG
and you should hopefully be able to reproduce the hang with
mythtranscode -i bad.mpg
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