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bbfa235
(Get the code!)
(In reply to comment #26)
> Created an attachment (id=47585) [details]
> Screenshot showing strange artifact(s) in tearing.
>
> I downloaded one of the youtube video's mr. Savin linked to and made a
> screenshot too.
>
> This is a screenshot of "Tearing test for Flash video player (30p
> source).1080p.mp4" played back using 'mplayer -vo xv', with XFCE compositing
> enabled. The turning compositing off does not make a difference and gives
> identical results. Also '-vo gl' gives identical results.
>
> There are two interesting things to note here. The first is that there is not
> just *one* line where the video tears, but many (really a lot tbh). This can be
> seen in the previous screenshot of the playground too, but here it becomes
> really apparent.
>
> What is even more interesting is the the strange artefact which can be seen on
> the right-most line, just below the middle of the screen. Here we can see *on
> the same line part* of the new AND of the old line (the lines in the video are
> moving left-to-right)! So the small thin upstanding line to the right is
> actually part of the next frame, and hence we are seeing parts of two frames on
> the same line.
>
> Combining the above two facts I don't think this is a simple 'scanline
> interrupt not being triggered' bug, but indeed something else. This would also
> explain why mr. Savin's patch doesn't seem to fix the issue. Unfortunately I
> have no idea what could cause such strange artefacts in the video rendering...
whoops, made a mistake. Where I said 'just below the middle of the screen' I meant to say 'just below the top of the screen' (I must have been looking at another screenshot). Sorry if I confused anyone :)