Determine field order w/o TV.

[Enter Name Here]

I discovered this on http://www.geocities.com/lukesvideo/ and it is a tolerable method of determining whether your DVD extract is top (odd) field or bottom (even) field dominant.

For newbies:
If you've followed a DVD ripping guide step-by-step, and experienced jerky, jittery playback on your TV, you can include the following process in the steps.

For more details, visit the above comprehensive website.

The reason why some people may prefer this method is because not all DVD players can play CD-RW to test a SVCD, and not everyone has a stash of CD-Rs to test with at any one time (like if you only have 3 CDs left).

If you've followed Sefy's wonderful All-in-One ripping guide, then you'll still have to use the Vfapi converter to make the *.d2v readable in VirtualDub.

Extra Tools needed:
VirtualDub 1.48 (amongst others)
AVIsynth 1.0 beta 3

Follow the usual instructions to install the above programs. (for AVIsynth, copy the *.dll into windows\system or winnt equivalent etc.).

Copy the following into notepad and save it as bottomfield.avs:

# Modify the line below to reflect the actual path and file name of your video.

------------------------------------------------------------------------------

AVISource("pathname.avi")


AssumeFrameBased

# To begin, leave the '#' before the 'ComplementParity' function.
# If the video plays smoothly with the '#' in place,
# the video is bottom (even) field dominant.
# If the motion in the video is jerky,
# remove the '#' before 'ComplementParity'.
# If the video plays smoothly now,
# it means your video is top (odd) field dominant.

#ComplementParity


SeparateFields

# Don't forget to save this file after making changes.

---------------------------------------------------------------


Copy the above again into notepad, remove the # before ComplementParity, and save the file as topfield.avs

Load each one separately into VirtualDub, and play input.

One of the files will play smoothly, while the other will seems to stop or jitter every few seconds.

If topfield.avs plays smoothly, encode topfield first.

If bottomfield.avs plays smoothly, encode bottomfield first.

Don't forget to compare, and not just assume smooth playing.

Ofcourse, it's still more reliable to try your SVCD on TV.

[adam]

There is a much easier and faster way to determine the correct field order to use. Simply import your video into TMPGenc as usual and under the advanced tab double click on the deinterlace filter. Set the filter to Even-Odd Field (field) and use the slider to scroll through your movie frame by frame. If it looks ok then your field order is correct. If it jumps back a few frames every couple of seconds then you need to change your field order. When your done don't forger to uncheck the deinterlace filter if your not going to use it.

[Enter Name Here]

Wow!!!

It really is so much easier.

Thankyou for the tip Adam.

(Is this well-known?? Maybe the method you use should be placed in the newbie dvd ripping guide.)

[bcmagog]

This is an old thread, but that is a huge help Adam, thanks!