Quantcast Transfer Videos: VHS Sources Should be Deinterlaced ? - digitalFAQ.com Forums [Archives]
  #1  
11-29-2003, 03:05 AM
logan555 logan555 is offline
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I have got a lot of vhs tape and would like to put them on KVCD.
The source is PAL interlaced ( aquired via DC10+ e avi_io ) 704 x 576.
To keep a good average between quality and size , shall I put in KSVCD ( 352 x 576 ) MPEG2 or kvcd ( 352 x 576 ) MPEG1 with some deinterlace filter ?
I would like to have a cartoon movie of about 80 min on a cd ( 80 min ) and a movie of 120 min on 2 cd .
Any suggestion ?
Keep MPEG or deinterlace to MPEG1 ?
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  #2  
11-29-2003, 06:14 AM
Encoder Master Encoder Master is offline
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If your source is deinterlace you have to use the specified Filter.
I think if the Videos aren't to fast in the movements you can use 480x576 mpeg-1 or 2 because I don't know what you player prefer.
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11-30-2003, 02:39 PM
incredible incredible is offline
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Well, on the one hand I would keep the stream interlaced ... Why?
Because you will preserve more auality as in case of deinterlacing. Ok, there are many filters to use for deinterlacing but if not really needed... iI wouldn't recomment it.
You should deinterlace IF you will encode as mpeg1... to safe space and obtain mor compressibility. So if your stream isn't that big and you'll obtain a higher AVG Bitrate than 2000kbit CHOOSE Mpeg2/interlaced.
When using avisynth filters, be shure to use them right for interlaced sources. Look at the "Optimal Script" Forum for the "How funny Thread". There at the end you can see for example how Boulder treated an interlaced capture.

Inc.
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12-30-2003, 10:49 AM
FredThompson FredThompson is offline
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Any time you deinterlace you throw away half the temporal information. You're also either exchanging half the spatial information for an approximation or all of it for an approximation. Deinterlacing also adds processing time.
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12-30-2003, 11:30 AM
incredible incredible is offline
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Hi Fred, shure leaving interlaced streams as they are will keep the quality at its best but... could you please verify your statements (if I understood you right).

Because it depends how you deinterlce, if you just perform a stupid bob shure a lot of information will be lost.

But its not correct in general that the half of the temporal information will be lost. Its just a matter how we treat interlaced material.
- discard fields
- full deinterlace
- adaptive/Smart deinterlace
- reverse phase shifts (on telecined material)
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12-30-2003, 11:40 AM
FredThompson FredThompson is offline
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For NTSC, interlaced is ~60 images/second, deinterlaced is ~30 images/second. PAL is ~50 and 25.

There are 2 basic options; keep one field and modify the second to fit it or modify both fields.

Oh, you're doing PC-only playback? In that case, yes, you can keep the original framerate.

I guess that also applies to progressive mode displays.

Well, even that's silly. In that case you'd end up with 50% of your data being interpolation, not actual source.

I think you're combining the concepts of deinterlacing and decombing.

As long as your source is clean and a progressive original, decombing is a great idea. Some odd framerates like those of early film can create problem, however. Mixed source or things which have been through multiple processings like some of the Anime or PAL broadcasts of NTSC interlaced versions of film can be real difficult to process.
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