encoding dark backgrounds

cybersharky · 22nd September 2009, 13:43

Hi,

I've just started to convert my Babylon 5 dvd's(720x576 PAL 16:9), in the tests I've done so far with Megui(x264), the dark backgrounds look grainy. You can see it slightly when playing the dvd, but it looks worse in the converted file.

I've uploaded an almost 20Mb demuxed sample from first VOB, see especially from 10 seconds.

http://garyonline.net/test/sample.demuxed.rar

Any suggestions or comments? I'm hoping to convert all my B5 dvd's with x264 into as good a quality as possible.

Thanks
Gary

CWR03 · 22nd September 2009, 14:46

It's quite normal to have a "grainy" look to dark or evenly-colored areas. It's an effect from any high-compression video codec.

foxyshadis · 23rd September 2009, 08:24

You can mitigate the effect by enabling dithering and high-quality rgb in the output (this is only an option for ffdshow, or madvr in mpchc or zoomplayer). Don't denoise too much or it'll look much worse.

22nd September 2009, 13:43	#1 \| Link
cybersharky Registered User Join Date: Jul 2008 Posts: 131	encoding dark backgrounds Hi, I've just started to convert my Babylon 5 dvd's(720x576 PAL 16:9), in the tests I've done so far with Megui(x264), the dark backgrounds look grainy. You can see it slightly when playing the dvd, but it looks worse in the converted file. I've uploaded an almost 20Mb demuxed sample from first VOB, see especially from 10 seconds. http://garyonline.net/test/sample.demuxed.rar Any suggestions or comments? I'm hoping to convert all my B5 dvd's with x264 into as good a quality as possible. Thanks Gary

22nd September 2009, 14:46	#2 \| Link
CWR03 Custom User Title Join Date: Mar 2005 Posts: 3,733	It's quite normal to have a "grainy" look to dark or evenly-colored areas. It's an effect from any high-compression video codec.

23rd September 2009, 08:24	#3 \| Link
foxyshadis Angel of Night Join Date: Nov 2004 Location: Tangled in the silks Posts: 9,559	You can mitigate the effect by enabling dithering and high-quality rgb in the output (this is only an option for ffdshow, or madvr in mpchc or zoomplayer). Don't denoise too much or it'll look much worse.