Poor image fluidity in VLC, is ATI to blame ?

el muchacho · Tux's lil' helper Joined: 26 Mar 2015 Posts: 78

HI,

i'm using an ATI 7660HD with the official FGLRX drivers.

However on some videos the quality is really poor. It may start well but I quickly get images that are, for a few frames, sort of melted together, difficult to describe but it sometimes happens for 1second when you start playing a video but then it goes back to normal. In my case it does it very regularly.

If i try to skip to a later point into the video... it freezes forever before reuming playing correctly.

I've seen a few complaints on the ATI driver, do you think this is the cause of this ?

Thanks

dirk_salewski · Posted: Wed Apr 22, 2015 3:25 am Post subject:

If it's the driver, then it might not be specifically the ATI driver, since I've got this problem on intel, too.

When I recently tried out Arch I noticed the problem was gone, so in any case at least here it's something that can be configured correctly.
_________________
Egal was Du kochst: Karl Marx.

szatox · Advocate Joined: 27 Aug 2013 Posts: 3137

Do you check system load when video goes messy?
What happens if you change video output?
Are you sure video file is not damaged?
HAve you tried another video player?
Does your GPU do any work there?

dirk_salewski · Posted: Fri Apr 24, 2015 4:08 am Post subject:

I'm slowly tracking that thing down.

szatox:
* System load has nothing to do with it
* files are sane

I'm gonna check switching player.

What do You mean with:
* change video output": swichting accelleration method?
* "does your GPU do any work": dri enabled, hardware decoding enabled, this kind of thing?

el muchacho, would you be so kind and check whether you have error messages (like: segfault e.g.) for libvaapi_plugin too? I have (which is why I belive that switching players might have good results).
_________________
Egal was Du kochst: Karl Marx.

dirk_salewski · Posted: Wed Apr 29, 2015 4:30 am Post subject:

Updates:

libvaapi-errors vanish when recompiled with USE="-vdpau"
xine and mpv do not expose this behaviour
vlc problem seems to be related to XVideo. Recompiling vlc with USE="-xv" solved the problem for me.

Would You please test the xv issue on your own? Maybe we can mark this solved? If your system is able to do output via opengl then XVideo is some sort of legacy thing, apart from what I understood by quick searches.

Greetings

Dirk
_________________
Egal was Du kochst: Karl Marx.