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View Full Version : Need a little help with NTSC Hybrid/Interlaced video


rampampam
27th March 2007, 16:52
Thanks in advance for looking and for your suggestions.

Here is a sample - http://maxupload.com/BC1E79F8

This is a good Hindi movie (Jaane Bhi Do Yaaron - 1983) so I am trying to do my best. DVD quality was very poor as you can tell from the sample. I am not aware of any better DVD material available, so I am working with what I have...

Here are several options I have been trying -
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DGDecode_mpeg2source("C:\Documents and Settings\Admin\Desktop\JBDY-sample.d2v")

#OPTION 1 - From MeGUI
#edeintted = AssumeTFF().SeparateFields().SelectEven().EEDI2(field=-1)
#tdeintted = TDeint(edeint=edeintted,order=1)
#tfm(order=1,clip2=tdeintted).tdecimate(hybrid=3)

#OPTION 2
#mcbob().selecteven()

#OPTION 3
#tdeint(mode=1)
#cdeblend().selecteven()

#OPTION 4 - takes it to 25fps, i think, if I understand correctly
#mcbob()
#mrestore()

#OPTION 5 - again takes it to 25fps?
#tdeint(mode=1)
#mrestore()

#crop( 6, 2, -6, -2)

#Lanczos4Resize(640,480) # Lanczos4 (Sharp)
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I have never delved into a lot of these before, so I am not sure if I am using them correctly or not. Being a beginner, I am also leaving quite a few at default values. Any suggestions would be much appreciated. IMO, the options that involve conversion to 25fps are better than trying to keep the framerate at 29.97fps ... I am not sure why ...

Also - if the framerate is changed to 25fps, how should I handle the audio - via virtualdub?

My final goal is a Xvid encode at quantizer=2, if that matters ...

Mug Funky
28th March 2007, 03:48
q2 xvid to me says you're not worried about bitrate...

therefore why not just deblock, colour correct and encode it in all it's mishandled, interlaced glory and watch it in NTSC?

xvid has an interlaced option, and it's quite efficient (though not as good as those found in mpeg-2 AFAIK simply because there's not much demand for it).

the filesize will be bigger this way, but quality will be the same.

the question of whether to go to 25 or 29.97 or 23.976 is a tough one that depends on the source. you'll have to determine if it was originally 23.976 or 25. do this with guesswork and stepping through frames...

rampampam
28th March 2007, 05:40
q2 xvid to me says you're not worried about bitrate...

therefore why not just deblock, colour correct and encode it in all it's mishandled, interlaced glory and watch it in NTSC?

xvid has an interlaced option, and it's quite efficient (though not as good as those found in mpeg-2 AFAIK simply because there's not much demand for it).

the filesize will be bigger this way, but quality will be the same.

the question of whether to go to 25 or 29.97 or 23.976 is a tough one that depends on the source. you'll have to determine if it was originally 23.976 or 25. do this with guesswork and stepping through frames...

Thanks for the suggestion, Mug Funky ... I did not consider encoding interlaced at all ... I just thought it might be a pain watching on a PC ... But I guess if it cannot be de-interlaced/deblended properly, that is an option ...

I did separate the fields and looked at the individual frames, but I am not experienced at telling what the original framerate was ... Considering that the conversion to 25fps looked better, I assume that it might have been a PAL source initially...

I was gonna clean up with fft3dfilter - I guess i can do something like this to leave it interlaced -

source()
deblock()
separatefields()
denoise() & maybe sharpen()
weave()
crop()
resize()
colorcorrection()

would that be the correct way to build an AVS file to feed the xvid encoder?

Thanks.