[mythtv-users] problem decoding 720p content

Mark Kendall mark.kendall at gmail.com
Sun Dec 10 09:06:40 UTC 2006

On 12/9/06, Michael Weber <mtweber at gmail.com> wrote:
> On 12/7/06, Michael Weber <mtweber at gmail.com> wrote:
> > I have two of the exact same computers (Intel Core Duo 1.66GHz, Asus
> > N4L-VM DH, 1GB, with nvidia PCX5300 128MB graphics), both are running
> > off the same minimyth distribution, so the os settings are the same.
> > The playback settings are the same (ffmpeg, kernel deinterlace).  One
> > machine decodes 720p perfectly and the other cannot without buffer
> > underruns (every couple seconds).
> >
> > At first I though that the network bandwidth was somehow different
> > (faulty wiring or something), but I just ran an iperf bandwidth test
> > and both machines came out at 90MBit+.
> >
> > Does anyone have any ideas how this could happen?
> >
> > BTW, 1080i on both machines works flawlessly.
> >
> > mike
> >
> I have some more information.  Neither of the computers work on my
> DLP(1280x720), and both work on my LCD (1360x768).  So it has
> something to do with the resolution.  And, if I change the resolution
> of the DLP to 1080i then 720p content works again.

I've seen similar issues when using 720p and bobdeint. I assumed for a
long time that it was a decoding issue but was in fact down to the
nvidia driver reporting a refresh rate of just under 50 fps when bob
needed 50. Are you definitely using kerneldeint?

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