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Inverse Telecine, Hi8

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August 14, 2002 7:20:44 PM

Hi,
Is there any software or hardware that can perform an inverse telecine on an existing video? Or is this the same thing as de-interlacing? I have some old Hi8 recordings that I want to transfer to my computer, but they were made on an old camcorder. I'm using a DV out from a (new) Sony camcorder to the firewire (iLink) port on an All-in-Wonder Radeon 8500DV. If I use the analog inputs would that make any difference?

-Kallenin

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August 14, 2002 9:04:41 PM

What exactly are you trying to do???

Interlacing is when you show every other line in one frame and then the other every other line in the next. This is how a regular tv works. You get lines 1,3,5,7,9...in one blink and 2,4,6,8... in the next. I think this was originally done because the electronics in the day were not fast enough to to play the lines in sequence like 1,2,3,4,5... so they "interlaced" the the scan lines that make up a tv picture. Computer monitors do not work that way. They (normally) use progressive scan and display every line in every frame.

De interlacing is the combining of the even and odd frames to make a progressive scan frame. The term is also used to decribe any blending filter process that makes the striping effect from interlacing less noticable.

Telecine is the addition of additional frames to make up for the difference between the "film" standard of 23.97 fps and the "ntsc tv video" standard of 29.97 fps. When a big budget hollywood film is originally recorded it is done on film. You can hold the film up to a light and see each frame of the movie and even with no projector you could get an idea what the movie was about. Film is recorded at about 24 frames per second and when you play a film back you play it at 24 frames per second. Most of us don't have a movie projector at our houses, we have vcrs or dvd players. The frame rate for a dvd is 29.97 frames per second. See the problem? When a movie that was shot on film is transfered to dvd it is telecined from roughly 24 fps to 29.97 fps by adding additional "dummy" frames.

Inverse telecine is the removal of the dummy frames to go back to 24 fps. This is done to save space and results in no quality loss cause the dummy frames are just extra anyways.

Pornos and cheep movies are shot on tape at 29.97 fps originally and do not need to be telecined to go to dvd and CANNOT be inverse telecined because they were never telecined in the first place.

Lastly, aiw 8500s are no good. My aiw Radeon is much better for what you are doing. Please send me your card and I'll send you mine in trade. You will be much happier with the original Radeon then the cheep copy you are running.

Give me fuel, give me fire, give me that which I desire.<P ID="edit"><FONT SIZE=-1><EM>Edited by LAKEDUDE on 08/14/02 05:11 PM.</EM></FONT></P>
August 15, 2002 5:25:36 PM

Put it short:

Need to convert to progressive video. :) 

Any programs?

-Kallenin
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August 15, 2002 8:41:13 PM

Ahhha

You should capture using a high res high quality setting on your 8500. Then you can use Nandub to convert from that to another format of your choice offline. Nandub includes de-interlacing filters. Get you a copy at <A HREF="http://www.doom9.net" target="_new">http://www.doom9.net&lt;/A>. Check out the guides to learn how to use it. Write back with any specific questions you may have.

Give me fuel, give me fire, give me that which I desire.
August 17, 2002 2:17:44 AM

Sounds to me like what you may really want to do is convert old analog NTSC video to DV video so you can edit it in DV just like you can with your newer DV tapes.

If this is what you want to do, your Sony DV camcorder will let you do it in one or possibly two ways:

1. You could transfer your analog tapes to DV by simply connecting the 8mm analog out to the to the analog in of your DV camcorder and recording. This would give you a DV copy of your originals which you could then edit just like any other DV tape. The camcorder would do all the converting for you as it recorded in DV. Recorded DV tape quality will vary with the quality of the original. Remember, you cannot improve the quality of the original by converting it. I think DV tapes have a bit better archive quality, in part due to their digital error correction capability. I'm not sure of the stability of the tape itself, but it is probably at least as good as the 8mm.

Any DV camcorder with analog inputs will let you use the above method.

2. Your Sony DV camcorder MAY also be able to act as a straight through analog to DV converter without ever recording to a DV tape. Most of the newer, mid-range and higher Sony DV camcorders will do this. In this case, you would create the DV file(s) directly on your computer, without ever making a DV tape. This would save the cost of the DV tape(s), though you could reuse the same tape again and again on the first process without much additional cost.

There are also stand-alone analog to DV converter devices that would operate like #2 above. The Sony DV camcorders are the only ones I know that give you this option. I have a Dazzle Hollywood DV-Bridge that performs this function for me though I really haven't used it much yet.

I hope I interpreted your question correctly.

BW
!