[mythtv-users] Request for help making live TV useable

Mark Lord mythtv at rtr.ca
Fri Apr 22 20:57:52 UTC 2011

On 11-04-22 04:12 PM, Bob Shanteau wrote:
> On 04/21/2011 07:38 PM, Mark Lord wrote:
>> That pixelation is a sign that "vdpaubuffersize=" was set too small 
>> (the default in mythtv is too small as well).
> I looked up how to set "vdpaubuffersize=" and found a web page entitled, 
> "Enabling VDPAU in MythFrontend" on the MythTV Official Wiki 
> <http://www.mythtv.org/wiki/VDPAU>. This page says to navigate to 
> "Utilities -> Setup -> TV Settings -> Playback -> Playback Profiles 
> (3/8) -> Custom Filters" and add to the list of comma separated options. 
> The problem is that there is nothing on my Playback Profiles page about 
> Custom Filters.
> This happens for two machines, one running MythDora 12.23 with all 
> updates to Fedora 12 and MythTV and with one running Fedora 14 and 
> MythTV 0.24-6.
> Am I missing something?

You have to then click on a profile and tunnel into the two screens
of settings for it.  The filters line is on the second screen.

Yes, it's buried rather deeply in the menus.  :)

The exact "vdpaubuffersize=" value needed will vary from system to system
due to the bug that tralph's commit (above) fixes --> the slower the system,
the higher the value, to avoid buffers being recycled slower than needed.

Eg. On my Ion2 box, 44 was the "right" value.
But on my GT240 Core2 box, 40 was sufficient,
despite both systems having identical VDPAU capabilities
(granted, the GT240 has a lot more stream processors though).

Now, with the patches linked earlier in this thread,
I don't specify "vdpaubuffersize=" at all, and both systems
play back high bitrate h.264 content without blocky sequences.


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