[mythtv] HD-3000 and changes from 18.1 to SVN

[Steve Adeff]

On Thursday 27 October 2005 11:29, Chris Dos wrote:
>  > Daniel Kristjansson wrote:
> >
> > On Wed, 2005-10-26 at 19:30 -0600, Chris Dos wrote:
> >>AFD: Looking for decoder for MPEG2VIDEO_XVMC
> >>AFD: Opened codec 0x8da96c0, id(MPEG2VIDEO_XVMC) type(Video)
> >>Estimated bitrate = 8000
> >>* Does this mean the estimated bitrate that the buffer needs?  I'm
> >> running 24360 right now.
> >
> > No, this means the estimated bitrate of the stream, it is used to
> > set the sizes of buffers for LiveTV and network streaming. If you
> > are getting playback problem while playing an existing recording
> > this isn't the problem.
>
> Yea, but could this be the difference between the 18.1 that I have that
> works using XvMC and the current SVN that does not.
>
> >>Do these log snippets provide any information that might point to the
> >> cause of my problem?  Thanks again for your time in looking at this.
> >
> > Nope, but you've eliminated jitter as the cause of the "frames ahead
> > of video" messages though. My best bet is that the sound card is
> > running a little fast. You can try playing with the values for
> > audio buffering, or use the video as the timebase instead.
> > Or, if you have a spare audio card, try using it instead.
>
> Tried the various settings.  Using the Extra Audio Buffering option causes
> a blue screen to be displayed when trying to watch HD.  In fact I have to
> reboot to reset the card so I can see HD again.  Using the video as the
> timebase also did not make a difference.
>
> I have a sound blaster audigy card I can plug in.  I originally did buy it
> for my Myth box, but took it out when the onboard VIA sound was working and
> providing more options for 7.l sound.  I'll try the sound blaster card
> again and post the results.
>
> > However, my guess is that this isn't your real problem. I think
> > your system is just too marginal to use nVidia's implementation
> > of XvMC for HDTV sized frames. The only thing you can really at
> > this point is the chromakey OSD. This might make HDTV work for
> > you (though probably not when the OSD is on screen.)
>
> I don't understand how my system is too marginal to play XvMC.  If I can do
> software decoding now using libmpeg2, I certainly have enough power to do
> XvMC. When XvMC is working on the 18.1, it's only using 30% processor to
> decode HD. I still think there is a problem in the changes for SVN compared
> to the 18.1 that works fine except for the OSD dropped frames problem.
>
> I enabled chromakey OSD and the problems still exist.
>
> I'm starting to think that this might be a problem relating to AMD
> processors as Todd Freeman was also having this problem and his system is
> 1/3 faster than mine.  If I remember right, you have an Intel processor and
> looking at the mailing list, most people that are doing HD are using the
> Intel procs.  Are there any source files in my 18.1 tree that you would
> want to take a look at to look at the differences in the code?
>
> I would like to find a solution to this if at all possible.
>
> 	Chris


I have an Athlon64 and currently do HD. I haven't tried to enable XvMC though 
since I can watch TV and my cpu maxes at about 85% according to top.

Steve