After some further investigation, I learned, that there are two APIs for this.
1. VA-API: for Intel with the tool: vainfo
2. VDPAU-API: for others with the tool: vdpauinfo
and there is the libvdpau-va-gl which translates VDPAU-API to VA-API.
Setting VDPAU_DRIVER uses this library and this library uses
"i965_drv_video.so" as VA-API backend.
According to the README.Debian of "i965-va-driver" it should be able to
H.264 D ILK+
H.264 E SNB+
MPEG-2 D CTG+
VC-1 D SNB+
Seems that this is not working as expected.
The "vainfo" uses "i965_drv_video.so", too. And it notes that MPEG2 is
vainfo: Supported profile and entrypoints
VAProfileMPEG2Simple : VAEntrypointVLD
VAProfileMPEG2Main : VAEntrypointVLD
Unfortunately this means, that we are in the wrong package for this
"Bug" (I assume Intel changed something in driver).
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Failed to open VDPAU backend libvdpau_i965.so: cannot open shared
object file: No such file or directory
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