Best way to prevent blockiness in dark areas?

[TDog2112]

When encoding to a VCD or SVCD from DivX, using TMPGEnc, what settings/filters are best to keep this from occuring?

Thanks in advance.

[BeTa]

Well, it all depends if the blockiness is already in the source video, or it is introduced during the encoding.

BeTa

[BeTa]

Oops...

BeTa

<font size=-1>[ This Message was edited by: BeTa on 2001-08-28 13:20:02 ]</font>

[dec0n]

When Using TMPEnc, I find that for SVCD's increasing the "DC Component Precision" helps this problem.
But a DivX source probably isn't the best anyways

Dec0n

[iant]

A technique I have found in the forums her that works quite well is to capture with the brightness set about 10 to 15 percent higher and then use a brightness/contrast filter in VirtualDub when frameserving to reduce it again. It sounds silly but it makes a pretty big difference. Possibly because the data passed to the encoder is more consistent.

[TDog2112]

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On 2001-08-28 08:17:40, dec0n wrote:
When Using TMPEnc, I find that for SVCD's increasing the "DC Component Precision" helps this problem.
But a DivX source probably isn't the best anyways

Dec0n
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I know I ran across this bit of info in the past, but, for the life of me I can't remember how to enable the greyed out options in the settings. Can anyone refresh me on this?

By the way, the source DivX looks great on the computer (i.e., no blockiness).

[BeTa]

[/quote]
By the way, the source DivX looks great on the computer (i.e., no blockiness).
[/quote]

Then in TMPGEnc, the Quantize Matrix tab has a soften blocknoise option (or something like that), select and leave the default value (35). Try and see.

BeTa

[hitechjunkie]

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On 2001-08-28 21:57:40, TDog2112 wrote:

I know I ran across this bit of info in the past, but, for the life of me I can't remember how to enable the greyed out options in the settings. Can anyone refresh me on this?
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[vitualis]

Before doing drastic things to your video (e.g., changing brightness and contrast) make sure that the gamma on your PC monitor is correctly set first. There is an applet that comes with Adobe Photoshop that helps you do this. There may be other proggies too.

Blotchiness of dark areas is sometimes simply a symptom of the gamma of your monitor being set incorrectly -- i.e., it is artifactual, your monitor may be exaggerating the differences in dark colours.

Regards.