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Why encoded video has weird contrast?
uuderzo
Newbie Location: Italy Joined: Jul 15, 2010 05:12 Messages: 37 Offline
[Post New] Jul 17, 2010 06:50
Hi all...

I have a project that uses several clips in AVCDH lite format.
Well, watching at these clips with Microsoft MediaPlayer, i see them with exxagerated contrast. Watching them with VLC i see them perfectly.

PowerDirector, in the preview window shows me all clips with perfect contrast but, after encoding the final result in MPEG2 1280x720 i see them like MediaPlayer does (both using MediaPlayer and VLC). I tried also encoding AVCHD 1280x720, both NTSC and PAL but nothing changes...

I wonder what's changing my clips contrast during enconding phase, and if there is something I can do to avoid this issue...

P.S. I attach a screenshot to show the difference between preview (correct) and final video (incorrect).
[Thumb - screenshot.jpg]
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screenshot.jpg
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440 Kbytes
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Robert2 S
Senior Contributor Location: Australia Joined: Apr 22, 2009 05:57 Messages: 1461 Offline
[Post New] Jul 17, 2010 07:12
I see the difference and to my eye the final result looks better to me.

Regarding the preview it is just an indication of the final product and even choosing the best quality it will not equal perfectly to the final product. My youtube channel====> http://www.youtube.com/user/relate2?feature=mhsn
uuderzo
Newbie Location: Italy Joined: Jul 15, 2010 05:12 Messages: 37 Offline
[Post New] Jul 17, 2010 08:07
Thank you for answering Robert,

I accept the fact that you like more the final result, but i wonder why VLC shows me the original clip as PowerDirector does, and after the encoding process it shows that difference. I don't think that an encoder will alter the contrast this way, no matter the quality settings...

Umberto
uuderzo
Newbie Location: Italy Joined: Jul 15, 2010 05:12 Messages: 37 Offline
[Post New] Jul 17, 2010 09:58
Found it!

My ATI Radeon 4570 video driver had the "Avivo" video "enhancing" feature turned on.

It looks like this function is used both by MediaPlayer for playing and PD for encoding (but not for preview). VLC seems to be "immune" to this feature.

Turning it to "Application settings" now finally have my beloved low contrast video!

Thanks all! Umberto
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