MPEG-2 528x576 to AVI conversion problem.

[madman1987]

Hello friends.

I have a .mpg file, here is the file info using media info



After calculation I found the it's correct resolution be 640x388.

Here are the filters that i have applied in virtualDub.



But my problem is that, after conversion the video looks blocky. I am using 2 pass xvid @ 2000kbps for conversion. Is there something that I am doing wrong.

Please help me.

Your kind help will be greatly appreciated.

[jagabo]

Don't use the Nearest Neighbor option for the resize. Try Lanczos3 instead.

388 pixels tall isn't an optimal height for Xvid. Try 640x384.

Oh, and for deinterlacing, check out Donald Graft's Smart Deinterlace filter.
http://neuron2.net/smart/smart.html

[madman1987]

Thanks jagabo for helping a n00b like.

Your suggestion & method worked flawlessly!

Here are the snapshots of the converted video..





And can you please tell me the difference between Nearest Neighbor & Lanczos3?

Also which the best method for deinterlacing?

Thanks again mate, you are a true expert in everything related to video. \m/

[jagabo]

And can you please tell me the difference between Nearest Neighbor & Lanczos3? :?

Nearest Neighbor duplicates or decimates pixels to resize the image. For example if you have 4 pixels and want to make 5:

A B C D --> A B B C D

or downsize to 3:

A B C D --> A B D

The result is very blocky, as you found out.

Lanczos3 uses an algorithm which doesn't generate those kinds of blocky artifacts and slightly sharpens the image. Precise Bicubic is similar. Precise Bilinear isn't as sharp but compresses a little better.

Also which the best method for deinterlacing? :?

Donald Graft's Smart Deinterlace is the best I know of for VirtualDub. VirtualDub's built in Deinterlace with the Blend option simply blurs the two fields together. The result is a little blurry and when there is lots of motion it looks like double exposures. The best deinterlacer I know of is TempGaussMC_beta1() for AviSynth. But you'll have to install AviSynth, track down and install a bunch of plugins, and learn AviSynth scripting. TempGaussMC_beta1() is very slow -- about 1/50th the speed of Smart Deinterlace. But the results are really good.

[madman1987]

Thanks for explaining it all.

And can you please tell me that the filters that i have applied are in correct order?

[manono]

The pic shows only 2 filters, the deinterlace followed by the resize. If that's all then yes, they're in the correct order.

[madman1987]

I have used three filters.

1. Deinterlace
2. Nulltransform
3. Resize

Are these in correct order?

[manono]

Oh yeah, you're right. You cropped with it. Sorry. Then yes, they're all in the correct order.