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| hara |
 Posted: Sep 4 2002, 09:54 PM |
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Hi
Is it possible to convert NTSC video to PAL video using Virtualdub?
Thanks
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| Ciler |
| Posted: Sep 5 2002, 06:44 AM |
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I think that you can have a look at menu Video > Frame Rate. The last box is about "Inverse Telecine (3:2 pulldown)". This sounds to me like what you want to do. Not sure however, I never tried this feature out. |
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| Tut_Ank |
| Posted: Sep 6 2002, 06:07 AM |
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| QUOTE (Ciler @ Sep 5 2002, 12:44 AM) | | I think that you can have a look at menu Video > Frame Rate. The last box is about "Inverse Telecine (3:2 pulldown)". This sounds to me like what you want to do. Not sure however, I never tried this feature out. |
With inverse telecine yougo back from 30 to 24 FPS. Pal is 25. |
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| ChristianHJW |
| Posted: Sep 6 2002, 08:18 AM |
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Advanced Member
Group: Moderators
Posts: 1768
Member No.: 2
Joined: 7-July 02
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This subject is delicate, but it can be done.
Most movies are 24 fps originally, and to comply with PAL standard, being 25 fps, they are simply played faster !
You cant believe that ? Well, compare the runtime of a normal movie in both NTSC and PAL version and you will find the PAL version is shorter !! This is not because some scenes were cut out, but simply because the movie plays faster on PAL.
Now, how can they sync the sound with that you may ask ? There are ways to change the speed of an audio track also by keeping the sampling rate, Cooledit e.g. is a program that can do that on WAV files. In former times the tones would change slightly by doing so, frequencies would shift upwards by about 4%, but in our days the processing can be done without altering the sound at all ( dont ask me how its done ).
So, a typical NTSC to PAL conversion of a movie would be like :
- 3:2 pulldown, changing framerate from 29.9x fps to 23.9x fps ( inverse telecine )
- setting framerate to 25 fps in 'video' 'framerate'
- decoding sound to WAV ( 'save as WAV' ; 'audio' : 'full processing' , audio compression : 'PCM uncompressed' )
- altering sound speed with Cooledit or similar, acceleration by +4%
- encoding to MP3 or whatever, using Vdub, 'video' set to 'direct stream copy' , 'audio' set to 'open WAV' ( then select your altered PCM WAV file, mode 'full processing' , in 'compression' select your audio codec and bitrate
For NTSC material that was originally TV material things are more complicated because a 3:2 pulldown is maybe not enough in some cases or the files order becomes very important, in some severe cases a suitable deinterlacing filter would have to be used and the video even be reencoded  !!
Last question :
As AVI is to be played on PCs and those dont care about PAL or NTSC, why would you mind at all what framerate your movie is ?
Please note that TV outs of video cards will always feed the TV with the right framerate, irrespective of the framerate of the movie. You can play a 15 fps, a 21 fps or 34 fps movie fine using your TV out of your PC !!
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Support matroska as container and Gstreamer as the only truely open, x-platform multimedia platform .... |
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| Tut_Ank |
| Posted: Sep 6 2002, 08:38 AM |
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To adjust the audio length yo van use the Wave length adjuster, a small program that does that. try to seach Wave length adjuster or WLA0.26.zip
but ChristianHJW is right, why should you care to change the framerate.
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| SynchronousArts |
| Posted: Sep 6 2002, 10:42 PM |
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| QUOTE (ChristianHJW @ Sep 6 2002, 12:18 AM) |
For NTSC material that was originally TV material things are more complicated because a 3:2 pulldown is maybe not enough in some cases or the files order becomes very important, in some severe cases a suitable deinterlacing filter would have to be used and the video even be reencoded !!
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To be technically correct, NTSC & PAL refer to the Composite Modulation Technique used for Baseband Video. Once Video is Component/RGB digital, we now think in terms of 525/29.97 or 625/25. High quality conversion between the 2 for Video source content is very complicated. See http://www.snellwilcox.com/reference/pdfs/...s/estandard.pdf and http://www.snellwilcox.com/reference/pdfs/emotion.pdf for a technical explanation. |
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| SynchronousArts |
| Posted: Sep 6 2002, 10:47 PM |
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| QUOTE (Tut_Ank @ Sep 6 2002, 12:38 AM) | To adjust the audio length yo van use the Wave length adjuster, a small program that does that. try to seach Wave length adjuster or WLA0.26.zip
but ChristianHJW is right, why should you care to change the framerate. |
If I remember correctly, BeSweet has some Pull up/dn adjustments too.  |
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