Inverse Telecine Experiment Results

[perdomot]

Well, I wanted to see if I could detect a difference in quality by using the IVTC filters of VDub and TMPEG when I convert my old vhs tapes to vcd. Here's the setup I used:

Capture with VDub using Huffy codec at 29.97fps.

Encoded with:
TMPEG NTSC template
TMPEG NTSC Film template
VDub telecine filter frameserved to TMPEG NTSC Film template

Added chapters with VCDEasy.

Burned image with Nero.

I "think" the TMPEG NTSC Film template looked best and encoded with the VCDEasy a bit quicker. I'm still not sure if the extra delay caused by the IVTC is worth it since the quality appears about the same. I haven't been able to try the avisynth because something appears to be wrong. I'm using the 2.5 version so I'm considering trying the 2.0 one to see if its a bug in the newer version. If anyone can show me how to write a proper script for a capture using VDub, here's my info:

Partition for capturing is J:\
Folder for capturing is VCR capture
Name of avi is CAPTURE

I tried writing a script in Notepad but might have saved in incorrectly. I'm really not sure. Anyway, thanks for any help offered.

[DJRumpy]

Version 2.5 is beta. You should stick with 2.0 unless your familiar with it.

Your script would look like this:

LoadPlugIn("c:\MyPluginDirectory\InverseTelecine.d ll")
AVISource("J:\VCR capture\capture.avi")
InverseTelecine(40,10,15)

That's about it. Of course, you would need to download an AVISynth Inverse Telecine filter, and put the appropriate path in the LoadPlugin statement above. Save the file as WHATEVER.AVS from Notepad.

The output from the script should be IVTC video at 23.976 fps. You can drop the AVS script into VirtualDub, and then select FILE | FILE INFORMATION to verify the framerate.

[perdomot]

Hi DJ,
Thanks for the script. I've been looking for the IVTC DLL but I can't find it. I did find the Decomb Legacy DLL which I've heard is very good also but I'm not sure if it will do the same thing. Where do I get the IVTC DLL? Thanks for the help.

[DJRumpy]

You can find a few here:

http://www.avisynth.org/index.php?page=Section+3%3A+Filters+and+colorspaces

Look at section Q3.3

You should also try a general search on google.com. Use the keywords:

AVISynth Filter IVTC

You'll get about 200 hits.

[SLK001]

I prefer to use Donald Graft's DECOMB for IVTC.

Use this script:

LOADPLUGIN("DECOMB.DLL") (Of course, your syntax will vary)
TELECIDE(GUIDE=1,SHOW=TRUE)
DECIMATE(CYCLE=5,SHOW=FALSE)

I haven't use the InverseTelecine DLL, so I can't comment which one is superior to the other. To view the progress of your settings, set the SHOW= statements to TRUE (do one at a time). Once you are satisfied with the end results, set both to SHOW=FALSE. I use VirtualDub to view my .AVS file.

[sammie]

Beat me to it SLK. BTW which versions of AVIsynth are you and DJRumpy using? I know it makes a difference for some filters, DG's DeComb is one if I'm not mistaken.

[SLK001]

I believe that I am still with 2.06. None of DG's DECOMB filters will work with 2.5+ (at my last check).

[DJRumpy]

2.07. I haven't tried 2.08 as of yet.

[sammie]

He has one that does (and 2.5 only) Guess how I know. I'm using 2.06 as well.

Glad this thread is around. Really want a good process for doing IVTC. So far I haven't been real happy with what I've done, and when you mention interlace (artifacts) the thread immediately heads off into left field about how interlaced vs. IVTC.

[SLK001]

and when you mention interlace (artifacts) the thread immediately heads off into left field about how interlaced vs. IVTC.

Yeah... there's a lot of confusion over INTERLACED and TELECINED video. And I do mean "a lot"! (As I'm sure you're aware!)

[sammie]

Actually, I forgot to respong to the initial post. I have generally "liked" the TMPEGEnc NTSCfilm best too. On close examination of individual frames, it seems to leave a lot of artifacts, but overall it seems to give the smoothest results. What I've really been looking for is a way to equal those results with CCE since it's a lot faster and seems to still ultimately give slightly better results than TMPEGEnc. DG's DECOMB comes close, but I still see a bit of a flicker in high motion.

[perdomot]

Well, I tried the sample scripts offered but I couldn't get it to work. I'm going to stick with VDub and TMPEG IVTC filters. Thanks for the help

[DJRumpy]

The script should have reported the line number that the error happend on. What script did you try, and what error was reported?

[perdomot]

I wasn't using the Load Plugin line. Didn't know I had to put that first. I'm trying to figure out the Sharpen command so if you have any advice, I'll take all the help I can get. The sites for avisynth didn't make it clear to me. Thanks.

[DJRumpy]

Sharpen is one of the eaiser commands. You'll find that anything between 0.1, and 0.3 is a good value:

Sharpen(0.2)