[mythtv-users] Extracting a portion of HD mpegts file from myth

[Tom Dexter]

On Sun, Mar 23, 2008 at 1:09 PM, Tom Dexter <digitalaudiorock at gmail.com> wrote:
> I'm looking to extract a portion of a show to a video file.  The show
>  is an HD recording of a Saturday Night Live episode in 1080i HD.  Note
>  that some of the problems I'm having may be due to NBC's awful
>  practice of mixing progressive and interlaced frames as well as
>  switching frame rates (are they just trying to screw with everyone or
>  what??).  Even mythtv will constantly enable and disable deinterlacing
>  playing their stuff unless you go into the video menu during playback
>  and force it on...really screwy stuff.
>

Wow...those NBC mpeg streams must be even flakier than I thought.  I
just created a DVD from the mpeg2 file using any2dvd (a frontend for
trancode etc).  That's always worked well for me, but on that show as
soon as it hit the first commercial the audio and video went miles out
of sync.  I'm sure that's from NBC changing frame rates.

I was at least able to get the portion I wanted by creating a cut list
in mythtv and then using:

mythtranscode -c 1041 -s 2008-03-23T00:43:23 --mpeg2 --showprogress
--honorcutlist --outfile snl2.mpg

I found that the --showprogress option is ignored for some reason when
the --infile option is used so I had to use the above.

Even that file seems to defy any conversion to xvid etc, resulting in
video that looks to be about 1/2 speed...damn these things are just
awful to work with.

Tom