[MPlayer-users] Forcing other framerates

[Rolf Ernst]

On 4/26/2010 10:59 AM, meino.cramer at gmx.de wrote:
> "Ing. Daniel Rozsnyó"<daniel at rozsnyo.com>  [10-04-26 17:21]:
>    
>> meino.cramer at gmx.de wrote:
>>      
>>> RC<cooleyr at gmail.com>  [10-04-25 20:00]:
>>>        
>>>> On Sat, 24 Apr 2010 16:32:40 +0200
>>>> meino.cramer at gmx.de wrote:
>>>>
>>>>          
>>>>> I bought a new LCD monitor with 60Hz framerate.
>>>>> When playing videos sometimes I git a distortet
>>>>> screen (not only with mplayer!!!). I think, it
>>>>> is because the video plays at 50Hz framerate
>>>>> which then interferes with the 60Hz refresh rate
>>>>> of the monitor.
>>>>>            
>>>> LCDs effectively do not have a refresh rate (or a "framerate").
>>>>          
>> LCD has a refresh rate! It refreshes the picture from top to bottom,
>> just the "memory effect" of the screen is much bigger than on CRT. The
>> LCD is effectively a visible dynamic memory (DRAM).
>>      
>    That means...?
>    Displaying Image contents with a rate of 25Hz to a technology
>    drawing every 1/60 second a picture...gives...?
>
>    
>>      
>>>> You've not described what this "distortet screen" problem is, so
>>>> nobody
>>>> can possibly help.
>>>>
>>>>
>>>> -- 
>>>> Ha. I'm the idiot.
>>>> _______________________________________________
>>>> MPlayer-users mailing list
>>>> MPlayer-users at mplayerhq.hu
>>>> https://lists.mplayerhq.hu/mailman/listinfo/mplayer-users
>>>>
>>>>          
>>> If LCDs have no framerate or refresh rate, they will not draw
>>> frames from top to bottom? How then?
>>> A try for a better explanation:
>>> Certain videos (for example the Neo<->Smith fight sceen in Matrix
>>> Revoluitions) with fast changing lightning conditions expose some
>>> screen distortions.
>>> They are of two kind:
>>> The upper half of the screen is still in "bright condition"
>>> when the lower half is in "dark condition" -- what comes first and
>>> where this "break" is, depends. Also varying is the position
>>> of this "break" on the screen.
>>>        
>> That is a missing vertical synchronization - what -vo are you using? On
>> what video card and which drivers? Usually on dualhead the vsync is
>> hard to get..
>>      
>    Oh, oh...some mails ago I got a hint to disable all VSYNCs in the
>    nvidia settings...
>
>    So...using -vo xv gives me the fastest (read: normal speed) video
>    with audio and video in sync.
>    Other drivers result in the message that my two core 3800+ AMD
>    CPU is to slow....(?)
>    My graühics card is ai
>    nVidia Corporation G73 [GeForce 7600 GT] (rev a2) which run with
>    the current nvidia drivers on a Linux box.
>    I myself and my computer each uses only one head ;)
>    Most of the time I use my own... ;) ;)
>    I disabled AutoTwinDevice in the Xorg.conf as I did with
>    TwindDevice (dont remember the correct names of that parameters, but
>    was something like that.).
>
>    Since 60Hz is common for LCD I am asking myself, whether I am the
>    only one having problems with playing 25Hz/region 2 contents...?!
>
>    Since it also happens for example with the fight scene Neo<->Agent
>    Smith in Matrix Revolutions (DVD, region 2) I think, it is not
>    a bug in the video itsself....
>
>    I am a little (read: very) frustrated, since this monitor is new
>    and I like its colors and features, but...
>
>    So any help to circumvent this problem is *very* appreciated! :O)
>
>    Have a flicker-free evening! :O))
>    Best regards,
>    mcc
>
> -------
>    
Somewhere along this thread someone stated that the LCD is refreshed 
bottom to top. This is simply not true (suggest 
http://en.wikipedia.org/wiki/Refresh_rate). The actual 'flicker' is 
around 200Hz which I doubt comes into play in this case.

Let me reiterate that I do what you are doing often and do not observe 
this symptom. Maybe it is some sort of interaction between graphics card 
and monitor?