[mythtv-users] VDPAU update from the front lines, December 2008

Yeechang Lee ylee at pobox.com
Tue Dec 2 17:10:11 UTC 2008

Brad DerManouelian <myth at dermanouelian.com> says:
> Mine is all white. It draws the shapes, but all colors are white so  
> you can't see anything but white shapes. I haven't figured out why  
> it's doing this on mine and not on other people's.

So it's not a 256MB/512MB issue? In any case it's cosmetic, of course.

> HD-PVR recordings all look beautiful.


> OTA recordings have little vertical imperfections that make it look
> a little blocky. It's hard to describe. Definitely noticeable, but
> also acceptable and not bad enough for me to stop using it for these
> recordings.

Hah! Irony of ironies, MPEG4/h.264 playback is better than MPEG2 at
the moment.

> The only other weirdness is a flash of green on the screen for a
> split second when starting to watch a recording.

Heck, I see that sometimes as it is. I think it has something to do
with a resolution change in the video stream.

> HD-PVR recordings are all 720p on my system. I haven't tried any other  
> format.

I know there are issues involved with HD-PVR capturing of 1080i, and
its handling of resolution changes, that cause people to set their
cable boxes to output 720p for everything--and I have no problem with
that--but I don't know whether the issues involve recording, playback,
or both.

> I also immediately bumped up my bitrate to the max since my system
> could now handle it.

Indeed. I've mentioned on the list before of my surprising success
with playing 6Mbps HD-PVR recordings, but why not use as much quality
as is now feasible?

> It was easy for me to jump into it because I was already running
> latest code from SVN and follow the lists so I know what is broken
> and what not to use, etc.

Every day my determination to hang on to my 0.21-fixes setup
weakens. The HD-PVR (still sitting in its white box six months after
arriving) by itself couldn't do it, but it plus VDPAU might. I know it
isn't going to happen but that doesn't stop me from wishing that a
backport to fixes would happen; since HD-PVR support's been backported
unofficially to fixes maybe we'll be lucky enough to see VDPAU done
that way as well, but I'm not going to hold my breath.

Frontend:		P4 3.0GHz, 1.5TB software RAID 5 array
Backend:		Quad-core Xeon 1.6GHz, 6.6TB sw RAID 6
Video inputs:		Four high-definition over FireWire/OTA
Accessories:		47" 1080p LCD, 5.1 digital, and MX-600

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