VirtualDub De-interlace

[Lee82]

Hi

I wish to add a de-interlace filter to virtual dub which is equal to the Linear/Bob filter of VLC

I have an interlaced captured avi, which when de-interlaced both with virtual dub or AutoGK the result is definetly not as good as VLC's Linear de-interlacing

Is it possible to add this plugin? if yes, where can I find it as google did not help me much
(i'm not very technical so i did not understand much of the result sites)

thanks
L

[jagabo]

Isn't VLC's Bob about the same as AviSynth's Bob()?

You won't find anything like this for VirtualDub because VirtualDub won't allow a filter to change the number of frames and frame rate. Bob deinterlacing creates twice as many frames and doubles the frame rate.

Have you tried Donald Graft's Smart Deinterlace (with the edge directed interpolate option) for VirtualDub?

[Soopafresh]

The later 1.7 Vdubs have bobbing built in. In addition to Graft's filter, there's a number of good ones from the Russian plugin authors - Try this pack - http://www.thedeemon.com/VDFilterPack/VDFilterPackSetup.exe

http://www.thedeemon.com/VDFilterPack/

[edDV]

There are downsides to bob deinterlace. Slow moving or still images may flicker.

Most high end TV deinterlacers will only bob in areas of motion and employ filtered weaves in slow areas. This is another reason why good TV or progressive DVD player deinterlacers perform better than software filters.

[jagabo]

There are many software smart bob'ers too.

[jagabo]

The later 1.7 Vdubs have bobbing built in.

I have 1.7.7 but can't find it -- except for MJPEG sources.

[edDV]

There are many software smart bob'ers too.

True but the bob filter in VLC isn't one of them. It is good for frame grab though.

[DarrellS]

I have 1.7.7 but can't find it -- except for MJPEG sources.

Virtualdub 1.8.0 has bob doubler, deinterlace and field bob built in.

http://www.virtualdub.org/beta/VirtualDub-1.8.0-test8.zip

[jagabo]

I have 1.7.7 but can't find it -- except for MJPEG sources.

Virtualdub 1.8.0 has bob doubler, deinterlace and field bob built in.

http://www.virtualdub.org/beta/VirtualDub-1.8.0-test8.zip

Thanks, got it.

[DarrellS]

You're welcome

[Lee82]

wow so many suggestions!
big thanks to all
i will try one by one right away

[h2p000]

Would you use all 3 of those filters for deinterlacing or do you just try them one at a time to see which works best for you?

[jagabo]

Use only one deinterlace filter.

[edDV]

Would you use all 3 of those filters for deinterlacing or do you just try them one at a time to see which works best for you?

Hardware deinterlacers use two or more deinterlace strategies in the same frame based on motion in blocks or isolated objects. Low motion areas get a simple weave to preserve high resolution, larger medium motion areas get a bob and high motion areas get reduced to single fields.

The eye is highly sensitive to flicker but as motion increases, perception of detail is less. Deinterlacer designers use these perceptual characteristics to optimize picture quality.

Best to leave video in interlace format and let the progressive DVD player or HDTV do the deinterlace. For computer playback, use a software deinterlacing player or rely on the display card deinterlaccer.

Valid reasons to deinterlace in software are web distribution or preparation for high compression. Just be aware of the quality reduction this entails.

[h2p000]

Well, what I have is a made for tv movie thats in an interlaced pal avi right now. I wanted to convert it to a 720x480 25 fps mpeg then convert using the dgpulldown method, but it says you have to deinterlace an interlaced source first and I have never done that.

I did just read a post saying that the smart deinterlace filter for virtualdub was the way to go. Any one had any experience with this, or know where I can find a guide for it?

[edDV]

Film is broadcast with both fields referencing the same frame in PAL. You need to do a weave and you have progressive.

Film in NTSC may be inverse telecined if cadence is pure and also can be restored to progressive.

Both techniques avoid deinterlace issues.

[jagabo]

Sequence to get out-of-phase PAL fields back to progressive frames:

SeparateFields()
Trim(1, 0)
Weave()

This separates the frames into fields, throws away the very first field, then weaves pairs of fields back into frames.

Guide for PAL to NTSC with dgpulldown:

https://forum.videohelp.com/topic300144.html?highlight=pal2ntsc