If both libXvMCW (from x11-libs/libXvMC) and libXvMCNVIDIA (from x11-drivers/nvidia-drivers) are installed then the mythtv configure script (around line 2631) will choose to use libXvMCW and not libXvMCNVIDIA. This happens regardless of whether the "xvmc" USE flag is set or "nvidia" is specified in VIDEO_CARDS. Reproducible: Always Steps to Reproduce: 1. Set "xvmc" USE flag 2. Add "nvidia" to VIDEO_CARDS 3. emerge mythtv Actual Results: Configure script shows: XvMC OpenGL sup. no XvMC libs -lXvMCW Expected Results: Configure script shows: XvMC OpenGL sup. yes XvMC libs -lXvMCNVIDIA The attached patch changes the ebuild to use explicitly request libXvMCNVIDIA if xvmc is enabled and nvidia is specified in VIDEO_CARDS. Perhaps there should be a new USE flag to specify this behaviour (xvmc-opengl)?
Created attachment 137615 [details, diff] Enable libXvMCNVIDIA
This has been discussed before. The depend changes are incorrect however since you will still need libXvMC installed. XvMCW is merely a wrapper to the proper XvMC backend. Currently MythTV does not have the proper code to handle directly linking to the libraries. Try this patch and then try to actually use MythTV and play back some HD videos. It won't work.
I realise that XvMCW is a wrapper but the mythtv configure script disables xvmc_opengl unless VENDOR_XVMC_LIBS is equal to XvMCNVIDIA. For this reason we need a way to specify that mythtv should link directly against XvMCNVIDIA instead of using the wrapper. > The depend changes are incorrect however since > you will still need libXvMC installed. I tested this on my system with no libXvMC installed and everything is working fine. > Currently MythTV does not have the proper code to handle > directly linking to the libraries. This may have been the case in the past but it most certainly is possible with SVN head. If you have a look at the configure script you can see that there are various allowed values for VENDOR_XVMC_LIBS which are used to directly link against the libraries. > Try this patch and then try to actually use MythTV > and play back some HD videos. It won't work. HD playback is working fine for me with this patch if I use the xvmc-blit video renderer (xvmc-opengl looks odd, but it wouldn't even work before the patch because as I said above, it is disabled if the VENDOR_XVMC_LIBS does not specify XvMCNVIDIA).
add libXvMCNVIDIA_dynamic.so.1 to /etc/X11/XvMCConfig and it'll work fine.
I'm sorry, but you are mistaken. With the "opengl opengl-video opengl-xvmc xvmc" USE flags, --xvmc-lib=XvMCW will be passed to the configure script and it will output: XvMC support yes XvMC VLD support no XvMC pro support no XvMC OpenGL sup. no Changing it to use --xvmc-lib=XvMCNVIDIA the configure script will output: XvMC support yes XvMC VLD support no XvMC pro support no XvMC OpenGL sup. yes This makes the opengl renderer available. It is not enough to merely enable XvMC on the system - the configure script checks explicitly for libXvMCNVIDIA
use mythtv-0.21_p16944.ebuild. It explicitly disables xvmcw.
what I said above..
After reading through the comments and my failure over the past two days to xvmc working with mythtv-0.21, I am not convinced that this issue has been resolved. My problem may be unrelated to this, but the output at the beginning of the mythtv emerge suggests that this may be the exact cause of my problem. (Also, If I add the opengl-xvmc USE flag, I seem to encounter bug 219149) # VIDEO_CARDS="nvidia" emerge -av mythtv These are the packages that would be merged, in order: [ebuild R ] media-tv/mythtv-0.21_p17100 USE="aac alsa dvb dvd mmx opengl perl python xvmc (-altivec) -autostart -debug -directv -ieee1394 -jack -lcd -lirc -opengl-video -opengl-xvmc" VIDEO_CARDS="nvidia -via" 0 kB Total: 1 package (1 reinstall), Size of downloads: 0 kB Would you like to merge these packages? [Yes/No] y . . . # Video Output Support x11 support yes xrandr support yes xv support yes XvMC support yes XvMC VLD support yes XvMC pro support no XvMC OpenGL sup. no XvMC libs -lXvMCW OpenGL video no OpenGL vsync yes DirectFB no Fribidi formatting no
A few details on the problem I ave encountered can be seen here: http://forums.gentoo.org/viewtopic-p-5075762.html#5075762
(In reply to comment #8) > After reading through the comments and my failure over the past two days to > xvmc working with mythtv-0.21, I am not convinced that this issue has been > resolved. > > My problem may be unrelated to this, but the output at the beginning of the > mythtv emerge suggests that this may be the exact cause of my problem. > > (Also, If I add the opengl-xvmc USE flag, I seem to encounter bug 219149) > > # VIDEO_CARDS="nvidia" emerge -av mythtv > > These are the packages that would be merged, in order: > > [ebuild R ] media-tv/mythtv-0.21_p17100 USE="aac alsa dvb dvd mmx opengl > perl python xvmc (-altivec) -autostart -debug -directv -ieee1394 -jack -lcd > -lirc -opengl-video -opengl-xvmc" VIDEO_CARDS="nvidia -via" 0 kB > Completely different version then what was reported here and fixed. There are newer issues with newer versions.
