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Weird brightness settings on playback

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Jakub Jaroszek
Weird brightness settings on playback
on Jul 25, 2010 at 8:03:25 pm

Hello,

I've had this problem for a looong time but lately it got annoying...

Here's a screen capture of two movie files: the one on the left is coded with DivX, the one on the left is an uncompressed MOV.

http://img186.imageshack.us/img186/484/brightness.jpg

The coded one drastically differs from the original. Anyone has an idea why?



Thanks in advance.


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Chris Blair
Re: Weird brightness settings on playback
on Jul 27, 2010 at 1:25:31 am

It could be a product of the media player interpreting two different media files differently. If I'm not mistaken, you're playing those in Media Player Classic. That's an ancient player. Try playing the two files in other players like VLC and see what they look like.

Another possible issue could be any direct show plugins you have installed, such as ffmpeg. The filters often order which codec they use to decode a particular format...for instance if you open an MPG2 file, it will use whatever MPEG2 codec ffmpeg has listed first as the one to decode it with, which may work fine, or could produce odd results, two of which are color inconsistencies and pixel aspect problems.

Bottom line, play the resulting file on whatever player it will be played on in it's final use. Then figure out where the problem is. If it's in the players and codecs, then all you can do is let the client know. If it's in the encode, then you know to make some adjustment there.

Chris Blair
Magnetic Image, Inc.
Evansville, IN
http://www.videomi.com
Read our blog http://www.videomi.com/blog


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Jakub Jaroszek
Re: Weird brightness settings on playback
on Jul 28, 2010 at 9:04:53 am

Hello and thanks for your interest.


It's not actually a 'work' problem, just a playback glitch that occurred a long time ago and I didn't really put too much thought into it. I thought it was a codec problem but every time I install a new one everything stays the same (default settings). It's kind of annoying because practically all DivX/Xvid files have messed up brightness. I know I could correct this in the codec's settings but shouldn't it be ok when freshly installed? I mean, what is the point in releasing video codecs that 'distort' your video files?


MPC is actually a quite good player. It's fast, reliable, opens most file types (video/image) and, from what I know, is still being developed. I'll try with some other player when I get back from work but I remember myself trying out a few of them a while back and everything was the same... Didn't try VLC though, I'll check that out later today :].


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Chris Blair
Re: Weird brightness settings on playback
on Jul 29, 2010 at 12:24:40 am

What software program are you using to do the encode? The only thing I can think of is there could be a setting for gamma somewhere in either the source or target settings, or there could be a setting for decoding the source file as RGB or YUV etc.

Those are typically the only things that will affect the color and brightness of your encode file in most encoding software.

Chris Blair
Magnetic Image, Inc.
Evansville, IN
http://www.videomi.com
Read our blog http://www.videomi.com/blog


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Jakub Jaroszek
Re: Weird brightness settings on playback
on Jul 29, 2010 at 1:15:52 pm

Yeah, I've tried with other apps and the problem vanished, WMP, DivX Player etc work fine. I really like MPC so I went to video preferences, changed rendering module to "Old" (?) and that did it. It's really weird since I used to have the same problem in WMP and some other players. But hell, it works now ;P.


Many thanks ;).


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Chris Blair
Re: Weird brightness settings on playback
on Jul 30, 2010 at 2:11:27 pm

Good to hear. Older media players are notorious for doing that...and even newer media players will all render colors a little bit differently. The bottom line is to play your resulting encode on the media player most likely to be used by your audience or client.

Chris Blair
Magnetic Image, Inc.
Evansville, IN
http://www.videomi.com
Read our blog http://www.videomi.com/blog


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