[mythtv-users] current status of HDTV patches

Daniel Walton dwalton at cisco.com
Wed Apr 7 09:27:38 EDT 2004

I applied Daniel's patches last night and the problem where the video would play
slowly when the status bar was up and XvMC was in use has been been fixed.  I
find that I can't use XvMC at all though, the picture has a very jerky feel to
it.  My CPU is fine and I'm not getting any errors from the frontend but it
seems like the picture is pausing for a split second every couple of frames and
that is making it so the video doesn't playback smoothly.


On Tue, 6 Apr 2004, John Patrick Poet wrote:

> On Wed, 7 Apr 2004, Brian May wrote:
> > >>>>> "Daniel" == Daniel Walton <dwalton at cisco.com> writes:
> >
> >     Daniel> I found some threads in Feb where danielk talked about a
> >     Daniel> series of patches he has for HDTV:
> >
> >     Daniel> http://www.mrl.nyu.edu/~danielk/mythtv/
> >
> >     Daniel> Have these made it into cvs by now or are all myth HDTV
> >     Daniel> users patching these in themselves?  Any other patches I
> >     Daniel> should know about for HD?
> >
> > Last I tried HDTV, I got poor (read: unusable) audio quality, and the
> > increased chance of the back-end crashing. Hmmm... Come to think of
> > it, I will see if I can reproduce the crash with debugging info...
> >
> > Could the audio issue be related to these patches?
> >
> > Also I see a reference to "the hdtv signal check patch", where can
> > this be found?
> I am actually not sure which of Daniel Thor Kristjansson patches have been
> incorporated into the cvs at this point.  I am pretty sure the "the hdtv
> signal check patch" IS in there.
> It used to be, that if I tried to tune to a station which was not
> broadcasting, mythfrontend would "lock up", and have to be killed.
> Now, when that happens, mythfrontend will return after about 15 seconds, and
> let you exit gracefully.
> HDTV works great for me.  The only audio problems I have, are caused by the
> local CBS affiliate.  They claim they have their audio problems fixed at
> this point, but I have not watched a show to verify.
> Daniel Thor Kristjansson himself has audio problems on his WB station.  I
> don't know if his problem is a Myth problem (HD-2000 driver?) or a station
> problem.
> The only Myth related audio problems I see, happen when changing channels.
> I cannot watch live TV and change the channel, without getting lots of
> prebuffering pauses.  If I [ESC] out to the menu, and then return to live
> tv, the problems go away -- until I change channels again...
> I have Myth setup to record seven HDTV programs a week.  It has not let me
> down in a long time.
> It is critical to have all of your HD frequencies configured properly in
> Myth.  If any of them are off, that can caused the backend to get very
> confused.
> John

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