[MPlayer-users] Mplayer crashes when adjusting contrast to the lowest value

[Giorgio]

2010/1/31 Reimar Döffinger <Reimar.Doeffinger at gmx.de>:
> On Sun, Jan 31, 2010 at 03:42:20PM +0100, Reimar Döffinger wrote:
>> On Sun, Jan 31, 2010 at 03:02:02PM +0100, Giorgio wrote:
>> > 2010/1/31 Reimar Döffinger <Reimar.Doeffinger at gmx.de>:
>> > > On Sat, Jan 30, 2010 at 11:02:43PM +0100, Giorgio wrote:
>> > >> I've noticed that when I play a file or watch tv using -vo gl, if I
>> > >> press the '1' key and
>> > >> keep it pressed until the image goes dark and the cursor on the OSD
>> > >> move to its lowest
>> > >> value, MPlayer crashes. Example:
>> > >
>> > > Two solutions:
>> > > 1) Let OpenGL do it, use e.g. -vo gl:yuv=2
>> >
>> > This solution works great, but the result is somewhat different,
>> > here's a screenshot of the image when the contrast is set to minimum:
>> > http://imagebin.ca/view/FqPE1hSN.html
>>
>> Hm, yes. I admit I considered it more correct, but to be honest I don't know.
>> With that one contrast really only reduces contrast, the other one also
>> decreases brightness (3) and saturation (7).
>
> Or easier to test:
> -contrast -50 -brightness -25 -saturation -50 -vo gl:yuv=2
> should be mostly the same as
> -contrast -50 -vo gl
> I don't like the behaviour of the later since it makes it impossible to
> get the effect your screenshot shows, but I don't mind adapting behviour
> (possibly even configurable) if I get a better idea of what people like
> and expect.

I'm by no means an expert on this subject (I'll have to read something
about it), but I find the behaviour of contrast when using -vo
gl:yuv=2 to be the correct one. Plus, other programs I've tried behave
in the same way. So, as far as I'm concerned, it might be useful to
change how contrast works when using -vo gl. Of course, I'd like to
hear what others think about this as well.

Giorgio Vazzana