[MPlayer-users] ass subtitles, vo gl and amd video

Reimar Döffinger Reimar.Doeffinger at gmx.de
Tue Sep 24 09:43:53 CEST 2013

Vladimir Mosgalin <mosgalin at VM10124.spb.edu> wrote:

>I don't know of a way to force vf_ass-like rendering on mpv, so I only
>checked default rendering with -vo opengl-hq - no performance problems
>at all, but subtitles look quite a bit sharper than in mplayer. Idk
>but for some reason mplayer always renders subtitles in 1.ass blurry
>me (not the case with other subtitles and 2.ass), while mpv renders
>edges sharp, as they're (I think) supposed to be.

1.ass and 2.ass are supposed to look exactly the same.
I see exactly two possibilities:
1) (likely) I misunderstood how line-drawing clipping is supposed to work. The way 2.ass and mpv render is just wrong, and the reason for the performance difference.
2) libass implements the line drawing clipping wrongly. That should mean that mpv uses a different fork of libass than the one you tried with MPlayer.

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