[Xine-vdpau] software equalizer (Gamma correction) not working with vdpau

[Christian Neumair]

2010/3/24 Christophe Thommeret <hftom at free.fr>:
> Le mercredi 24 mars 2010 18:10:38, Christian Neumair a écrit :
>> Dear xine-vdpau developers,
>>
>> using the Ubuntu Karmic the-vdr-team svn build based on xine-vdpau svn
>> revision 284, I was unable to get xine's software equalizer to work. (...)

>> My use case involves vdr-sxfe which is based on xineliboutput, for
>> applying Gamma correction for a presentation beamer that was not made
>> for movies and TV. I'd also be happy if the xgamma setting was applied
>> on the vdpau window, but this does not seem to be the case. Any ideas?
>
> This works here with xine-lib-1.2

Does that mean that the xgamma setting is applied to the xine vdpau
window on your machine? Because in my case it isn't :(. What nvidia
driver and xine build do you use exactly? vlc+ffmpeg-vaapi seems to
respect the xgamma setting, though.

I feel a bit dumb now, because I think one would have to understand
the internals of X11, X11 gamma correction, vdpau and the entire Linux
video hardware stack to understand how gamma correction works in
detail [i.e. whether it is applied in hardware or software], and why
it doesn't work for my vdpau xine. All I can say is that gamma
correction of xv output seems to work for myself.

> Note that the post filters won't work with hardware decoding, so if your avi
> file contains mpeg1/2, vc1, or h264 video, no post filter!

Thanks for the comment, it looks like in my mplayer test, post
filtering only worked because I did not use vdpau for decoding, but
just the vdpau output display driver. mplayer probably is supposed to
use a vaapi-patched ffmpeg for decoding, and something in my tool /
lib chain seems to be seriously broken so that mplayer doesn't pick up
the ffmpeg codec.

best regards,
 Christian Neumair