[mythtv] testing mythtv-vid branch - questions & problems
danielk at cuymedia.net
Sat Jun 30 19:38:07 UTC 2007
Note: If you have any more questions, please move them
to the users' mailing list and send me a note, I'll follow
the thread there.
On Sat, 2007-06-30 at 11:38 +1000, Matt Doran wrote:
> > This looks like a bug. Could you note this on the #2287
> > ticket? Just so it doesn't fall through the cracks..
> I managed to get my hands on a nvidia 7600gs, and it performed much
> better.... even enabling opengl vsync worked. On the 6150, opengl vsync
> caused all kinds of odd problems.
Did you disable the automatic vsync settings in
nvidia-settings? These mess with MythTV's vsync
and also lower video decoding performance overall.
> Although I only tested the 7600gs for an hour or two, I found it to be
> less stable. Sometimes it would crash, other when I started playback
> it would just pause for 1-2 secs play a few frames, pause again, play a
> few frames, over and over. If I stopped an restarted the playback it
> would fix itself up. So the stability just doesn't appear to be there
> yet .... but maybe it's the drivers I'm using??
If you were still using the 9xxx ones rather than the two
versions I mentioned then yes it could be the drivers. You
may also need to play around with your XOrg settings, BIOS
settings and nvidia driver args and nvidia-setting variables
to get the best OpenGL performance.
> Does you know what video card would be required to render 1080i content,
> and deinterlace it? The nvidia purevideo drivers can do this easily
> on pretty average hardware.... but I'm not sure how that compares to how
> mythtv opengl rendering compares.
I'm not aware of any cards that can render 1080i using our
OpenGL renderer, but then again the newest nVidia card I
have is a 6800. nVidia PureVideo is a completely different
beast and is not available under Linux. Not that it is
something we couldn't implement ourselves, it would just
be a few months of work for someone talented to tackle it.
> It's pretty disappointing that the nvidia drivers are so
> inconsistent. Is there any information out there to provide
> recommendations on the best version to use ... e.g. listing known
> problems with each? I've looked but the information is hard to come by.
No, before the last release I tested some drivers and found ones
that didn't appear to have any problems with MythTV, but the ok
ones were all 7xxx release drivers. There are probably islands
of bug-free-ed-ness for MythTV at higher releases, but I'm not
aware of anyone doing exhaustive testing.
> > BTW Make sure you restore your DB after testing, the mythtv-vid
> > branch does change the DB & DB schema revision number.
> I noticed that it only added 2 tables, so I could just drop those and
> decrement the DBSchemaVer setting if I wanted to move back to trunk, right?
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