[mythtv-users] Viktor's Bob deint patch for interlaced modelines

Seth Daniel mythtv.org at sethdaniel.org
Sat Mar 22 18:39:07 UTC 2008


On Sat, Mar 22, 2008 at 11:43:08AM -0400, Tom Dexter wrote:
> On Tue, Jan 29, 2008 at 6:43 PM, Seth Daniel <mythtv.org at sethdaniel.org> wrote:
> > On Tue, Jan 29, 2008 at 05:15:02PM -0500, Tom Dexter wrote:
> >  [...snip...]
> >
> > > By the way...do you know offhand if that patch still works in trunk?
> >  > If there's no better alternative when 0.21 comes out I'd still like to
> >  > use it.
> >
> >  Viktor's patch works on trunk.  I'm using it on trunk now.
> >

[...]
> I'm replying to an older post here.  I'm waiting for a stable Gentoo
> 0.21 ebuild before I upgrade.  I was reading about playback profiles
> here:
> 
> http://www.mythtv.org/wiki/index.php/Playback_profiles
> 
> Currently on 0.20.2 (using the above patch) I'm using libmpeg2 (no
> XvMC) and bob deinterlacing outputting at 1080i.  Once I upgrade I
> have no reason I'm aware of of to use anything more complex in the way
> of profiles.  If I create a profile group with a single playback
> profile using a resolution "> 0 0", libmpeg2, xv-blit, and bob
> deinterlacing, should it just work like my current configuration?
> Some of the things I'm reading here, especially regarding performance
> etc have me a little concerned.
> 
> Seth: I'd be especially interested in your setup, as I think it's much
> like mine.

I run HEAD so my setup isn't _exactly_ like yours.  Should you upgrade to
0.21 the first thing you will probably want to do is get rid of all of
the new playback profiles that are created.  Why?  Well, I discovered
that new profiles were created: High Quality, Low Quality, ...  The old
profiles still existed also: cpu++, cpu--, etc...  I kept updating cpu++
assuming it was the profile being used...I was wrong.  I started seeing
a performance degradation in my playback and it turns out this was
because the 'High Quality' profile was being used.  The 'High Quality'
profile uses the 'Linear Blend' deinterlacer which, as I'm sure you
know, doesn't work well with our setup.  We need to use Bob (or possibly
Yadif, but I haven't tried that yet).  Anyway, I deleted *all* the
profiles and created a single new profile that had all the correct
settings (xv-blit, bob(2x), etc...).

Read this thread if you have not done so already:
http://www.gossamer-threads.com/lists/mythtv/users/323483?search_string=WTF;#323483

It explains about the new profiles.  If I had not read that I never
would have known what to do to fix my playback issues.



> Also, would there be any advantage to using ffmpeg over libmpeg2?  For
> example, does ffmpeg support closed captions?  That's one of the few
> downsides of libmpeg2 I've run into.

I've never used anything other than ffmpeg.  I can't comment on CC since
I've never used that.  Sorry.  Occasionally I've briefly switched from
ffmpeg to libmpeg2 but I never can tell a difference between the two.

-- 
seth /\ sethdaniel.org


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