[mythtv-users] HD-PVR giving up

Kenneth Emerson kenneth.emerson at gmail.com
Wed Nov 4 02:25:12 UTC 2009


On Tue, Nov 03, 2009 at 02:21:58PM -0600, Kenneth Emerson wrote:

> > >
> > >
> > > ...sounds like a frontend that doesn't have enough horsepower to play
> back
> > > the recording in question. I got a similar result when I tried to play
> back
> > > a 720p HDPVR recording on an AppleTV.
> > >
> > > [deletia]
> > >
> > >   Depending on your frontend gear, you might want to lock your cable
> box
> > > into a lower resolution. I had mine at 480p to accomodate my slower
> > > frontends like the AppleTV.
> > >
> > Jedidiah:
> >
> > Thanks for your feedback.  I'm running a Q6600, 2.4Ghz quad core, so I
> don't
> > think this is a CPU issue.  My OTA recordings at 1080i are rendered fine
> > without using VDPAU.  I believe that the problem is actually in the
>
>     OTA, eh? Yes. I have similar problems myself. Anything OTA that has
> visible blockiness tends to make the trunk internal player crash. I can
> play the recordings back fine with any other player.
>
> > recording itself, not in the playback.  I transferred a small piece of
> the
> > video to a Windows laptop and played it with vlc with the same results.
>  I
> > haven't played with any of the bitrates available through the v4l-ctl
> > utility.  This may have some impact on the output.  I'll try to play with
> > this later.
>
>     HDPVR recordings (assuming you are in the US) are much more system
> intensive than OTA recordings. MPEG2 is easy. h264 can be downright hard.
> ______
>

Thanks, I stand corrected.  After some experimenting I now understand how
much more intensive H264 is to decode than mpeg2 which I guess is why so
much attention has been paid to VDPAU and the NVIDIA driver. Until I got the
HD-PVR working I haven't had to deal with it at all. Just goes to prove the
rule of inverse knowledge ("the less you know about something, the more it
can do").

-- Ken

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