[MPlayer-users] Color problems with video

Deron Kazmaier deron at pagestream.org
Mon Nov 21 06:02:16 CET 2011

On 11/20/11 9:41 PM, Deron Kazmaier wrote:
>> On 11/20/11 2:47 PM, Carl Eugen Hoyos wrote:
>>> Deron Kazmaier<deron<at>  pagestream.org>  writes:
>>>> [decklink] Selected display mode: HD 720p 59.94
>>> Is this a decklink-only problem? (Works fine for me with -vo gl).
>>> Sorry, this wasn't initially clear to me.
>>> Carl Eugen
>> I don't know. Did you scale/pad to 1280x720 in your test? If so, then 
>> it must be.
>> The decklink requires IMGFMT_UYVY (or less so IMGFMT_BGRA). What 
>> could be the problem, if other video works? The driver should fail 
>> with any other formats.
>> Can I force output to one or the other to see if one of the two code 
>> paths is incorrect?
>> Thanks for any suggestions.
>> Deron
> Well, looking at another video that plays properly, it also produces 
> output that indicates that the video is yuv420p (it happens to be a 
> VC1 encoded file).
> And I'm pretty sure that the ProRes files I have played are the same.
> So what about this file could cause the confusion? I see an alignment 
> error in the output I posted. Could that cause flipping of bytes that 
> scrambles the color? (It does after all appear like u & v are swapped).
> Deron

Not an alignment issue, unless it is related to the scaling. I found a 
1280x720 mp4 h264 that plays just fine but gives the same alignment 
warning. The only difference appears to be the need for scaling. 
However, I use scaling with other video (probably not h264. Most of the 
files I am testing with are VC1 or ProRes).

Possible the reason you could not see the issue was you are outputting 
to an RGB device? Just a guess.

Are there different color encoding methods in h264 that I should be 
looking for to help track down what is funky about these files?


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