VirtualDubMod Settings for MPEG2 to AVI

[Dobermann]

Hi All,

In this thread, https://www.videohelp.com/forum/viewtopic.php?t=145121 , RadicalEd speaks of when to use Full Processing mode vs Fast Recompress. When I do that, using Fast Recompress and Huffyuv, the 4+ minute file is only 1.7G when I was expecting 8+G. If I select Uncompressed RGB, I do not know if I am changing the type from YUV whatever to RGB, especially since I cannot find any way to determine what type my clip is.

When I use Full Processing Mode - contrary to what RadicalEd says - and select Huffyuv, the resulting file is 2.8G. What am I missing? I am trying to convert it so that I can edit the AVI in Premiere LE, and I know the file size should be around 8G when converted.

Thanks,
Dobermann

[junkmalle]

4:1 or 5:1 compression (vs uncompressed RGB) is not unheard of for HuffYUV in YUY2 mode.

MPEG decompresses to YUY2 or YV12 (both YUV color formats), both of which are smaller than the uncompressed RGB equivalent (YUY2 is 2/3 the size, and YV12 is 1/2). VirtualDub can send that directly to HuffYUV for compression where it gets compressed losslessly by another 2:1 to 3:1.

If you use full processing mode the YUV data is converted to uncompressed RGB (which loses a little color accuracy) before compression. You only need to use full processing mode if you plan to filter the video in VirtualDub.

[Dobermann]

Thanks ever so much for the explanatin on MPEG decompressing to YUV. So based upon what you have said, the Fast Recompress using HuffYUV would be best, regardless of it being the smallest in size. I did run it four different ways and here are the file size results:

Full Processing Mode using HuffYUV, 2.977 G
Full Processing Mode using Uncompressed RGB, 8.313 G
Fast Recompress using HuffYUV, 1.7 G
Fast Recompress using Uncompressed RGB, 8.118 G

Right?

Thanks,
Dobermann