resize in me gui

[vrpatilisl]

hi everybody

i want to know what actualy resize filter in Megui do to video,in layman term. i dont find much visual difference in preview.
thanxs
:readrule:

[Amateur]

it changes the actual resolution in pixels. For a standard NTSC DVD (North American region) I think the resolution on the disc is 720x480. If the video is supposed to be displayed in a 4:3 aspect ratio, you would need to change this to 640x480 (meaning 640 pixels wide and 480 pixels tall). If the video is supposed to be displayed in 16:9 ratio, you could either choose anamorphic where megui will tell the video to display in the proper ratio or you could change the ratio to something like 720x400 to be very close to a 16:9 ratio.

It just like picture files on the computer.

[hello_hello]

I think vrpatilisl was enquiring as to which resize filter to use.

Lanczos or Spline36 are the ones I use. Generally I can't see any difference between them.

[LoRd_MuldeR]

Some info on the different resize kernels can be found at this location:
http://svn.int64.org/viewvc/int64/resamplehq/doc/kernels.html

(Especially look at the "Blurring -vs- Sharpness -vs- Ringing" charts)

[hello_hello]

If you run some test encodes using different resizers (all else being equal) the resulting file size of the encode can be an indication of the sharpness of the resizer.

It's not always easy to see the difference in resizers if you're just viewing the video in the preview window, especially if you're resizing standard definition video, as the preview window is quite small. You'd probably have to display the video full screen most of the time to see the difference.

Of the resizers MeGUI offers, I think most people would use Spline36 or Lanczos, but don't take that as gospel. Lanczos is the resizer AutoGK uses. Spline36 seems to be pretty popular. I can't see any major difference between them but Spline36 seems to give a slightly smaller file size so I tend to mostly use it.

It's probably best to run some small test encodes yourself to see which you prefer. I never resize up so I haven't compared resizers going in that direction myself.