[ATrpms-users] XvMC, nVidia, MythTV, FC5

[John Pilkington]

John Pilkington wrote:
> Axel Thimm wrote:
>> On Mon, Mar 05, 2007 at 10:13:45AM +0000, John Pilkington wrote:
>>> I'm running MythTV 0.21-154_trunk_r12854.fc5.at at i386 under kernel 
>>> 2.6.19-1.2288.2.1.fc5 at i686 and nvidia-graphics9631, which is apparently 
>>> the latest build that supports my graphics card, a GeForce4 Ti 4200 with 
>>> AGP8X.
>>>
>>> The problems that I have reported earlier are no longer appearing: 
>>> repeating 'cannot open demux device', hangups in MythTV cutlist editing 
>>> and in Smart, and the system is working very well.  Thanks, Axel and all 
>>> the devs!
>>>
>>> But it puzzles me that I still can't use the internal DVD player in 
>>> Myth; the menu is displayed, with sound, but it hangs with repeating 
>>> 'opening codec' reports when a title is selected, from both an iso image 
>>> (Archive tools) or a real DVD.  There don't seem to be many other 
>>> reports of this, so I looked more carefully at the frontend messages.
>>>
>>> I found this when an item was selected from the DVD menu, or from 'play 
>>> recordings':
>>>
>>> XvMCWrapper: Could not load hardware specific XvMC library 
>>> "libXvMCNVIDIA_dynamic.so.1 ".
>>> libXvMCNVIDIA_dynamic.so.1 : cannot open shared object file: No such 
>>> file or directory
>>>
>>> My /etc/X11/XvMCConfig contained just this file name, as suggested here:
>>>
>>> http://www.mythtv.org/wiki/index.php/XvMC#Configuration
>>>
>>> When I replaced this by the full path, (from Smart gui, 
>>> nvidia-graphics9631-libs, content)
>>>
>>> /usr/lib/nvidia-graphics-1.0-9631/libXvMCNVIDIA_dynamic.so.1
>>>
>>> the warning message d/path/to/filename.mpg
isappeared,
>> Isn't /usr/lib/nvidia-graphics-1.0-9746 in /etc/ld.so.conf?
> Yes:
> /usr/lib/nvidia-graphics-1.0-9631
> include ld.so.conf.d/*.conf> _______________________________________________
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> 
>> $ /sbin/ldconfig -p  | grep libXvMCNVIDIA_dynamic.so.1
>>         libXvMCNVIDIA_dynamic.so.1 (libc6) => /usr/lib/nvidia-graphics-1.0-9746/libXvMCNVIDIA_dynamic.so.1
> And Yes, making allowance for the different installed driver, I get:
> 
> [mythtv at localhost FC5]$ /sbin/ldconfig -p  | grep libXvMCNVIDIA_dynamic.so.1
>          libXvMCNVIDIA_dynamic.so.1 (libc6) => 
> /usr/lib/nvidia-graphics-1.0-9631/libXvMCNVIDIA_dynamic.so.1
> 
> but I still get the XvMCWrapper error message if I don't specify the 
> full path in XvMCConfig.  Could it be that it can't be loaded because 
> it's already active?  'Play recordings' works fine like this, and a 
> second or overwritten instance of XvMC might perhaps explain the 
> increase in CPU load(??)  Being able to use the internal player isn't 
> vital, but it just looks like an indication that something isn't right.
> 
I've now tried the xine and mplayer commands suggested in the wiki 
reference above, first with the short and then the long line in XvMCConfig.

xine -V xxmc /path/to/filename.mpg

mplayer -vo xvmc -vc ffmpeg12mc /path/to/filename.mpg

With xine, playback quality was fine in both cases.  The 'short' version 
gave the 'could not load library' message and a CPU load of 12%; the 
'long' version gave no error message and a CPU load around 25%.

With mplayer, the 'short' version gave the 'could not load' message and 
quit.  The 'long' version played well, with no message, but CPU load was 
around 45%.

Neither xine nor mplayer had the stuttering sound, or the yet higher CPU 
load, that I got in Myth.

So with my setup, at present, XvMC seems to offer no advantages and I 
should perhaps just stop trying to use it.  I suppose YMMV?

HTH, John P