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| Hi everybody! |
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Posted by: AMP - 2015-06-22, 09:58 PM - Forum: Presentation
- Replies (2)
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(Hi, Dr. Nick!)
I'm not an OT.com member (...yet), but I've admired the work done over there for many years. Looking forward to contributing to the discussion/preservation!
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| IVTC, Motion-Adaptive, DEFT (Avisynth) |
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Posted by: Valeyard - 2015-06-22, 04:57 PM - Forum: Restoration guides
- Replies (4)
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1. IVTC
The NTSC pulldown pattern (3:2) is a repeating of fields every 4 fields. The odd and even fields have their repeats at oposite times, for instance:
EVEN: 1, 2, 3, 4, 4.
ODD: 1, 2, 2, 3, 4.
This gives you three progressive frames, and two interlaced ones, and that pattern repeats.
In Avisynth you can use a simple function to recover the underlying 23.976p frames as so:
Code: TFM(order=0)
TDecimate()
However, it can also be done manually. It's usually not desirable to do it manually, but it does help to understand how to do it nevertheless. One advantage of doing it this way is that you can find where edits were made in the stream that break the pattern.
Code: converttoyv24()
separatefields()
fields_evn=selecteven()
fields_odd=selectodd()
fields_evn
fields_evn=interleave(selectevery(5,0), \
selectevery(5,1), \
average(selectevery(5,2),0.5,selectevery(5,3),0.5), \
selectevery(5,4))
fields_odd
fields_odd=interleave(average(selectevery(5,0),0.5,selectevery(5,1),0.5), \
selectevery(5,2), \
selectevery(5,3), \
selectevery(5,4))
interleave(fields_evn,fields_odd)
weave()
converttoyv12()
2. Motion-Adaptive.
Field-blended material. Some people have labelled these "improper conversions", which is unhelpful because it's not the case. If we assume that they were improper conversions, then we assume there's not a proper way to restore them to their original frame-rates. However understanding that they are a proper standards conversion allows us to find the best way to restore their original frame rate. One such method used is described in this patent. It worked by dropping about every 6th frame when going from NTSC to PAL, and by repeating or interpolating every 5th frame the other way.
Prior to the invention of the DEFT device in 1989 it was not possible to IVTC a NTSC telecine. Even after that no method could go from 30i to 25i without field blending. There was a method to go from 25i to 30i without blending, and that involved converting the video to film - developed by the BBC in the 1960's. That method threw away half of the video fields, converting 25i video to 16mm film @ 25fps. Besides the use of film-out as a go-between, if the standards conversion was done before DEFTs were invented your source will have intra-field blending. If it was done sometime in the 90's, there's still every chance they used a motion-adaptive method to go between formats. This is especially the case when going from PAL to NTSC. It is possible to create a 3:2 pulldown from a PAL source as well.
Sometimes you need to use AssumeTFF() or AssumeBFF() at the start of the scripts below to correct the input field order, as IcePrick has found.
2a. Good quality standards conversion
"scharfis_brain" on the Doom9 forums posted a method to remove the field blending. I improved upon the method.
Code: separatefields()
PointResize(width(),height()*2)
interleave(selecteven().crop(0,2,0,0).addborders(0,0,0,2),selectodd())
interleave(repair(selecteven(),selectodd(),0,9,9),repair(selectodd(),selecteven(),0,9,9))
interleave(selecteven().crop(0,0,0,-2).addborders(0,2,0,0),selectodd())
crop(0,4,0,-4)
PointResize(width(),height()/2)
weave()
QTGMC(Preset="Placebo")
AssumeFPS(60000,1001)
Part1=trim(0,183056).FixBlend()
Part2=trim(183057,0).FixBlend()
Part1 ++ Part2
Function FixBlend(clip orig){
orig.changefps(25*4,linear=false)
selectevery(4,2)
return last
}
That's just an example. You need to find the right value for FixBlend(try selectevery(4,0) ... (4,1) ... (4,2) ... (4,3) until you find the right value), and you can use whatever bob-deinterlace you want, however QTGMC is very good. The first part of the script does chroma correction - not perfect, but you will notice a significant improvement especially in high-contrast scenes, for quite little cost. The result will still contain ghosting in a number of frames, but should contain no blended frames. It needs to be called two or three times for a whole movie because Avisynth will loose sync eventually, no matter what.
This usually works if the source was done with a good standards converter. This is because the conversion usually runs the whole length of the original format tape at once, converting from NTSC to PAL (or vice versa) on the fly. This is also why the speed doesn't change - the only time the speed would change is if modified equipment was used to change either the playback speed or the recording speed. Although this is possible, after extensive testing on these sources I haven't yet seen one.
2b. Poorer quality standards conversion
If the pattern doesn't seem repeat itself, first confirm the original framerate. Use separatefields and count out the number of unique frames in the video over a length of 500 or so. This gives you the true framerate, so that when you use "changefps" you can use the correct value - if it still doesn't work, and you know the correct framerate, this is a poorer quality standards conversion and you need to use Srestore. Srestore doesn't like going to non-integer framerates, it's usually best to use assumefps first to change the framerate to a value that will allow the restored value to be a whole number. Of course, just like above you need to bob-deinterlace first.
Here's an example:
Code: QTGMC(Preset="Placebo")
AssumeFPS(60)
srestore(frate=24,speed=-25)
AssumeFPS(24000,1001)
3. DEFT
The DEFT (Digital Electronic Film Transfer) device was the first device to be able to automatically identify duplicate fields and remove them whilst converting the video from 59.94Hz to 47.952Hz. The DEFT device won an Emmy award in 1994 - it was the best, by far, way to convert a NTSC telecine to PAL. In order to record the output onto a PAL tape, a modified recording device would be used that would record the tape at 47.952Hz instead of 50Hz. Here's a paper by the company that made the device, with an explanation of how standards conversions work. Essentially it's a device that IVTC's a NTSC telecine, it works pretty well, but it does leave behind a few problem fields throughout the output, and also pretty much all frames have some quite light combing due to individual filed resizing (and some frames have worse combing). There's a very very easy way to fix this:
Code: QTGMC(Preset="Placebo",TR2=0,NoiseProcess=2,NoiseRestore=0,GrainRestore=0.5)
selecteven()
On those settings, it doesn't distort the output or lose detail, all the combing is fixed, and there will be no more interlaced frames. Tweak the 'Grainrestore' option from 0 to 1 as desired.
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| Hello |
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Posted by: Roy Neary - 2015-06-21, 05:55 AM - Forum: Presentation
- Replies (5)
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Hi!
I have been a longtime OT.com member, though not very active in recent years. Username there is zack371. This place looks great and I'm glad to be here!
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| Mr. Holmes (2015) |
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Posted by: The Aluminum Falcon - 2015-06-20, 10:21 PM - Forum: Movies, TV shows and other
- Replies (2)
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Anyone see this movie yet? The reviews seem generally positive though not glowing.
I'm a big fan of the Sherlock Holmes character, and Ian McKellen looked good in the trailers. That said, I'm not sure about director Bill Condon, whose filmography includes such wonders as The Twilight Saga: Breaking Dawn Parts 1 and 2 and The Fifth Estate...
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| Audio synced to Bram Stoker's Dracula HDTV? |
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Posted by: titanic - 2015-06-20, 11:28 AM - Forum: Requests, proposals, help
- No Replies
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Hello.
I've just downloaded a 720p HDTV version at rutracker (4.31GB) of this movie (i hate the Bluray look) which has the original colors but unfortunately it has only Russian audio.
I was wondering if anyone has synced any original English audio for this...
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| BD Authoring |
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Posted by: HDVinnie - 2015-06-19, 02:50 AM - Forum: Converting, encoding, authoring
- Replies (3)
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Was wondering if anyone can assist me with the man of steel BD50 I'm making. This as you guys know is all new to me in the area of making custom bds and color grading.
I have my BD50 complete with my color graded video and stock menu. Trailer was replaces with a after effect intro i made and the warner bro intro was replaced with my hdvinnie intro. Also applied the color grade to the interactive menu preroll clip. The BD works and plays. Issue is I'm not sure how I can add all the other subs and ac-3 audios i have. Im guess i need to then rebuild the bd and playlist? Im on a mac so this is a disavantange when it comes to bluray authoring.
Any help would be appreciated
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| Aye |
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Posted by: JawsTDS - 2015-06-18, 07:53 PM - Forum: Presentation
- Replies (6)
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Hi everyone, I'm 'Jaws' and I originally joined OT for preserving Jaws material, but have moved more towards the Star Wars scene now. Either way, looking forward to seeing the cool material on here.
Special thanks to _,,,^..^,,,_ for unbanning me. Should've posted in here soon, my mistake 
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