deinterlacing video

[JohnDavidson5000]

Hello. I converted from DVD to AVI (first using DVD2AVI, and then using TMPEnc to make the AVI) for use on a computer. I'm not planning on dumping it to VCD or anything.

I used the deinterlacing option because without it, real fast movement in a scene would result in artifacts.

My problem: with deinterlacing turned on, it looks horrible! Characters in a scene are kind of like shimmering or out of focus.

Do you have any suggestions on how I can have the best of both worlds here? (Scenes with fast movement and no artifacts and deinterlacing.)

thank you!

[VideoPhreak]

I cannot be sure as I am new here but what I do know is that DVD files are flattened already (MPEG) De Interlacing is used for video files since there are 2 fields for every frame of video, and a complete frame of video is not complete until the 2 fields are combined to make a frame. Some applications are field aware and will choose a dominant field for displaying the images (i.e. upper field first or vise versa). Since (I assume) you are ripping the video from a DVD, the deinterlacing has already taken place in the original encode process and the seperate fileds have already been 'flattened' into individual frames. So to go back and use a deinterlace proceedure is actually re-processing the video file hence the poor quality. I would look deeper into this to see where the problem lies, sorry I dont know where to tell you to look but I am certain that de- interlacing an MPEG is going to cause poor quality.

[N0SoopForU]

Try using the area-based deinterlace filter with Virtual Dub. That might get rid of the "shimmering" effect you mentioned.

You can find the filter here: http://home.bip.net/gunnart/video/

[Vejita-sama]

Ok, if this is a DVD source the first question is what type of interlace source is it? Is it a from TV 29.97 true interlaced source, of a movie that's been telecined to 29.97.

If it's a movie, then you've got two choices. One under DVD2AVI enable force film. This will convert the 29.97fps interlace source to 23.976fps progessive.

OR, you can inverse telecine (aka IVTC) it to restore the original 23.976fps (ok I know it was shot at 24fps) source. This is MUCH slower. So i would just use force film to save time.

Take a look at: http://toolbox.sgi.com/TasteOfDT/documents/video/lurker/fields/fields.html

for more info on progressive vs. interlace, fields vs. frames, etc. etc.

[kinneera]

Another thought...the particular deinterlace method chosen in TMPGEnc can have a substantial effect. Using even or odd field only can cause some noticeable detail loss, using the even/odd adaptive can cause odd jittering, and double actually results in surprising blurriness (try these with animation sometime, its remarkable). One of the best methods appears to be the "double (adaptive)" option. Unfortunately, the lack of documentation for TMPGEnc makes it unclear what any of these various methods are really doing.

[cuervo]

the problem you're experiencing is because the field order of the interlaced video is swapped or inverted. Deinterlacing won't help...you need to swap the filed order. The best way to do this is with Virtualdub and donald Grafts smart deinterlace filter, available from a link on virtualdub webpage. Tick the phase shift and invert field order after phase shift radio buttons in the deinterlace filter configuration window.

This seems to be a problem with the DV codec. I wish these software makers would get their sh*t right.

[hindmost]

I have had a similar problem. I ripped the VOB files from the DVD, then used dvd2avi (as per the tutorial) to create the d2v and wav files. Then in TMGEnc selected the files, I didn't use SVCD presets because I'm not interested in stand alone DVD player play back and thus wanted a larger frame, use VBR encoding also because time wasn't a issue. Hit start and waited...

What I got was a video that is badly interlaced! So I tried using the SVCD preset. Ditto. I haven't a clue what I did wrong or what I should do to correct it.