divx movie coverted to svcd with dvd2svcd looks dark

[techdude]

hi guys can someone please help me with this problem. i used dvd2svcd to convert my divx movies to svcd i am using cce encoder to encode my movies to svcd and when i play them on my dvd player they look too dark is there any why to ajust the Brightness in cce encoder or the dvd2svcd program. thanks for the help.

[Nick]

Yeah, I can think of a way it can be done but will need a bit of experimentation on your part.

You will need the latest version of DVD2SVCD with Avisynth 2.5x

In the Frameserver tab select under "Edit AviSynth Script" to "Edit as part of video encoding".

When prompted, at the bottom of the script (not sure if this is technically the best place but it will work - other more technical types might assist here Hint Hint ) type

Tweak(0,1,x,1)

Where x is a number between one and 255. 0=default brightness, 255 is pure white.

The only way I can think of to get the right value is trial and error. Use Virtual Dub to select, say, 1 minute of your avi file. Set Audio to No Audio and Video to Direct Stream Copy then save the new avi.

Now convert the clip in D2S using CCE in CBR mode with no .vaf file. It'll take like 5 minutes. When bbMpeg fails as it can't find the audio file, close DVD2SVCD, rename you Encoded Video.mpv file to *.m2v and then you can play it in WinDVD (or similar).

I would start with x at about 20 then go up or down as necessary to find the right setting. For the full lowdown on how to set the Tweak parameters look here.

http://www.avisynth.org/index.php?page=Tweak

Or if it all sounds like too much trouble you might find some useful knobs on your tv set! :D

Edit: I've read around on this a little and tweak(0,1,12,1.5) sounds worth a go for starters. Not quite as bright as the 20 I first suggested but adds a bit of contrast to boot.

[jsoto]

Hi techdude,

I am sure Nick didn't know you are a cross poster. Please follow the rules.

jsoto

[techdude]

cool i will give it a try thanks alot.:D

[gerti67]

Hi techdude,

as Nick already said, please do not crosspost - this isn't nice - so please delete your thread in the other forum - I think you can still doin' it by hitting the edit button and then tick the delete option as it still has no answers.

To your problem:

As you use AVIs as a source you can't use the DVD2AVI luminance setting to increase brightness - but this is not the best option anyway.

I prefer the AviSynth "Levels" filter because of one reason - it corrects the gamma value in YUY2 colorspace and not only the brightness. Where's the difference? - For example a "Tweak(0,1,x,1)" will also brighten the black borders but with the "Levels(0,x,255,0,255)" filter the black borders will stay pitch black - that's why I prefer this filter.

The "x" parameter with the Levels filter defaults to 1 and does not change the picture in any way then - useful range is from 0.5 to 2.0 I'd say. I would start with 1.3 or 1.5 for example to "brighten" the picture although it technically is gamma correction.

See the AviSynth "quick_ref.html" in your AviSynth 2.5 directory for more info about the parameters of "Tweak" and "Levels".

Hope this helps,
Gerti

P.S. I would've attached a picture but this feature seems to be disabled now - anyone know why - did I miss something in the past?

[johns0]

how about frameserving the avi file thru virtualdub and using the brightness,contrast filter?

[gerti67]

Hi again,

I uploaded a sample picture to show you the differences.

http://www.gerti67.de.vu/pictures/tweak-levels.jpg

The picture in the middle is the original dark scene, on the left is the picture with the "Tweak(0,1,20,1)" setting and on the right is the one with the "Levels(0,1.3,255,0,255)" filter.

Decide for yourself which you prefer. But you can easily see the difference. The black bars stay black on the right one.

Greetz,
Gerti

[jorel]

excuse me to "jump" here...

:)
thank you very much gerti67.

your explanations are great,
now i know why the black bars was too brighten using tweak.
using "levels" is really better!
the samples shows it clear...great.