[mythtv-users] Wierd blur/corruption at the bottom when playing video

Brad DerManouelian myth at dermanouelian.com
Mon Jan 19 22:15:13 UTC 2009

On Jan 19, 2009, at 1:50 PM, Jean-Yves Avenard wrote:

> Hi
> 2009/1/20 Brad DerManouelian <myth at dermanouelian.com>:
>> Because you appear to want to use it and are complaining about the  
>> bottom
>> portion. He suggested a work-around until you can fix your problem.
> You can admit that's a very weird way of solving the issue...
> Like saying can't watch this video? don't watch it problem solved...

Again - not solving the issue. Working around it until a solution is  

>> I haven't seen anything like this on the list, so it appears to be  
>> something
>> unique to your setup. Please provide as much information about it  
>> as you can
>> including
>> MythTV version, video card and driver version, playback settings,  
>> does this
>> happen with all videos or just particular ones, what have you done  
>> to try to
>> troubleshoot and as always, logs.
> This happens on all my PC running myth:

I ask again, what version?

> one is: E8200 Core 2 Duo with nVidia 8600GT, mythbuntu 8.10 64bits
> running mythtv from there. Running on a projector 1920x1080
> other: E8500 Core 2 Duo, nvidia 9400GT, mythbuntu 8.10 32 bits,,
> running on a 1920x1080 TV
> other: macbook running CentOS 5 with myth packages from ATrpms,
> build-in screen 1280x800

I ask again, what video driver version?

> One video being played:
> report from mplayer:
> Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
> Selected video codec: [ffodivx] vfm: ffmpeg (FFmpeg MPEG-4)
> = 
> = 
> = 
> = 
> ======================================================================
> = 
> = 
> = 
> = 
> ======================================================================
> Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
> AUDIO: 48000 Hz, 2 ch, s16le, 112.0 kbit/7.29% (ratio: 14000->192000)
> Selected audio codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3)
> = 
> = 
> = 
> = 
> ======================================================================
> AO: [alsa] 48000Hz 2ch s16le (2 bytes per sample)
> Starting playback...
> VDec: vo config request - 632 x 258 (preferred colorspace: Planar  
> YV12)
> VDec: using Planar YV12 as output csp (no 0)
> Movie-Aspect is 2.45:1 - prescaling to correct movie aspect.
> VO: [xv] 632x258 => 632x258 Planar YV12  [fs]

Again, I ask for log files where you're seeing the problem. You said  
it's fine in mplayer but not mythtv yet, you provided the log where  
it's ok and not where it's broken.

> Here is a screen capture of one video exhibiting this problem:
> http://img72.imageshack.us/my.php?image=capturejw3.png
> Easier to see here:
> http://img231.imageshack.us/my.php?image=capture2up8.png
> If you look carefully at the bottom lines of the videos, you'll see
> that they are made of lines above repeated several times...
> After a bit of investigation, the behaviour happens when using the
> OpenGL video renderer... If using the xv-blit rendered, the it
> displays just fine

Ah.. a clue. Is OpenGL Video Renderer even meant to be a supported/ 
released feature? (I'm not asking you, I'm asking someone who follows  
this feature in -dev since I was never very interested in it I don't  
pay attention). Log files might lend a hand in narrowing down the  

> For now, I have modified my default display profile so if displaying
> videos with height < 400, then I use xv-blit instead of opengl...

Ahh.. a work-around until you solve the problem. I guess they do have  
some value after all.

> BTW, I've noticed that the profile won't be applied if I don't set the
> width to something different to 0... I would have thought that when
> say the field W is 0, it means it matches any width..

 >0 should work for any width greater than 0. Are you making it >0 or  
just 0? If it's just 0, 0 means 0 not to be used as a wildcard for  
"any width".

BTW, if you plan on being snarky *and* wanting help, please provide  
all the information requested. It will take you less time to get  
closer to a solution that way. (Yes, I realize this message is snarky  
in response, but only because you put zero value in a valid work- 
around suggestion that someone thoughtfully went out of their way to  
provide you.)


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