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View Full Version : Need help with pulldown and PAL-speedup


JanBing
28th August 2004, 00:00
Hello, I need some serious help or guideline.

I am planning on putting my VHS-tapes of the TV-show "Brisco County Jr." on DVDs. This is basically a simple process (which I've done several times), but this time it's a little more complicated:

My VHS-tapes are in PAL (they have the German dubbed versions of the Brisco-episodes on them), and I want to make a PAL-DVD out of them (720x576 at 25fps). Furthermore, I have the English versions of the episodes as SVCDs, which are in NTSC (in this case 480x480 at 23.976fps), so I want to have both audio tracks (German and English) on the DVD.

My plan was to capture the VHS-tapes, so that I already have the video at PAL size and framerate, and just take the audio from the SVCDs, make a time-correction with a wave-editor and put it all together like this. Now, the problem is, that capturing a 45 minutes episode takes 45 minutes And doing this for all 28 episodes is a HECK of work. Additionally I found out, that the quality of the SVCDs id slightly better than my VHS tapes.

What I want to do now:

I want to take the video from the SVCDs (480x480, 23.976fps), convert it to 720x576 and speed it up to 25fps. Technically, the audio from the VHS-tapes should now fit this video, am I right? I am not sure about this, because when I look at a single frame of the VHS-PAL-version, there are interlace-lines in the frame, whereas the SVCD-video (at 23.976fps) has full-frames (or at least there are no interlace-lines)... after speeding up the SVCD-video to 25fps, there of course STILL aren't any interlace lines.

My question: How is the PAL-conversion of the video realized in the TV-world? Is the un-telecined 23.976fps-video simply sped up to 25fps? Or is it telecined to 29.976fps and then slowed down to 25fps? I just don't get it...

I just want that the video from the SVCDs is in perfect sync with the audio from my PAL-VHS source... or, in other words, I want my SVCD-video to run exactly as fast as my PAL-videos. Is there a EXACT way to do this?

---EDIT---

OK, I have tried around, and I've found out, that if I put a 23.976fps-video (converted to an 720x576 AVI-file) in to a 25fps project in Adobe Premiere, the audio of the PAL-VHS is perfectly in sync with the video. The problem is: Having a 23.976-video in a 25fps-project causes several frames to be duplicated, which is logical, but ugly and jerky. Isn't there a way to use frame-blending, and using the advantage of fields?

DaRat
28th August 2004, 13:10
The best way for you to go imho is to simply speed up the video, resize it to 480x576, and adjust the audio accordingly. In terms of picture this will give you the best result, imho.