[MPlayer-dev-eng] [PATCH] mplayer has broken Letterboxing with xv Video Output on i3wm

[Tobias Girstmair]

Hi Reimar, thanks for having a look!

On Sat, May 21, 2022 at 10:38:42PM +0200, Reimar Döffinger wrote:
>FYI one important case that needs testing is that resizing works, 
>smoothly and flicker-free.

I tested this right now both with and without a compositor (picom). I 
can't see any flicker on the video in all cases.

>That has been the reason why in the past it was not fixed, breaking 
>tiling window managers seemed preferable of breaking resizing with 
>non-tiling window managers.
>I think the issue is that with PAspect you would still end up with 
>window sizes a few pixels off.

Right, I can see that (with some debug printfs): during resizing, the 
window size is sometimes (not always) one pixel larger than the video 
size in one of the dimensions. IMO if that happens, filling the blank 
space is still the correct thing to do.

>So you would end up drawing these borders even though the tiny bad 
>lines are of no real consequence (and probably should be fixed by 
>changing the size of the video that is drawn).
>And doing so, especially during a resize sequence results in really bad 
>flickering.

Are you talking about the video or the border flickering? The only kind 
of 'flicker' I can observe is that the video resizing lags behind/isn't 
synched to the window resizing (giving either a little bit of black on 
the right and bottom edge when increasing window size, or clipping the 
video in the same corner when making the window smaller). That happens 
with and without my patch and is (i believe) unrelated to drawing the 
letter/pillarboxes. If it were, I'd expect to see 1px wide lines, not 
whole sections.


	tobi