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Side stepping borkage noted, captain
"I have not failed, I have found 10,000 ways that will not work" -Edison
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I doubt that if the free radeon driver worked well in Wheezy, there was that much of a regression in Jessie. Usually most of those video players are trying to use the xv video output by default--so the output of the commands
glxinfo #(the first ten lines should be enough)
xvinfo
apt-cache policy firmware-linux-nonfree
or installing inxi and running
inxi -g
should be very informative.
I also don't know if Jessie's SMPlayer supports mpv--even if it does, the old mpv in Jessie isn't going to work really well with it, plus you have to manually set SMPlayer to use mpv in its Preferences.
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