Conversion from PAL signal to NTSC signal on recording AVIs

[sladezero]

Hey there,

Nice to meet all of you. Well I have a question. Actually, it's a question
someone else asked me. I can't answer it since I don't have the hardware
to test it. If you are capturing a PAL signal and wanted to convert it to
NTSC, would you just set up to the FPS to 29.97 and Format to 352 X
240 ?? Would this get all the video or would you lose or cut something
out ??? We are looking at someone taking a PAL siganl off a VCR and
trying to re-RECORD it to NTSC so they can watch it on an NTSC standard
TV ??

Thanks again for your help.

SladeZero

[Anonymous65]

You can give the above a try, but you might get some strange motion artifact. I tried converting the frame rate and line rate in Vdub during capture and also during mpeg encoding, and I saw no difference. I had the strange motion artifact on both records.

The trick with frame and line rate conversion is that is has to be done continuesly, and not every second, like capturing the first 25 frames in the NTSC signal and trash the last 5 frames and call it PAL. This will give horrible motion artifacts. What has to be done is to drop every 6th frame so that when one second is up, you have captured 25 frames out of the 30 frames. The same goes for the line rate conversion.

I find it strange that someone has not yet written a simple filter for PAL/NTSC rate converion for use with Virtualdub. Well, somebody might have written the filter, but I haven't seen it. Even high broadcast quality conversion should be a simple software program, with motion compensation using several frames for removal of almost all motion artifacts.

[sladezero]

Hey there,

What do you mean by motion artifacts ??? I see you on the 6th frame every 6 frames...makes sense here. All this encoding is kinda new to me.
I can capture video and compress it a little but that is about it. I am
1 week new to this.

Thanks for the info

SladeZero

[Anonymous65]

Motion artifacts, meaning jerky and non-fluid motion. (looks terrible)

[MrKGB]

I also need to convert from PAL to NTSC.
I remember seeing somewhere that TMPGenc can do this trick.
I don't think that just dropping 6th frame will do the job, you will get motion problems.
I think interpolation is required here.
Anybody has expeience with PAL->NTSC?
What is the best workflow in this case:
1. Capture as PAL, edit in PAL and then convert to NTSC
or
2. Capture directly in NTSC (if possible)

[aguillon]

Sure, fire up TMPGEnc, load up your video into it, load up the appropriate NTSC template (VCD or SVCD, you can also custom-design), adjust the resizing to your liking ( most likely full screen/keep aspect ratio) and fire away.

The resulting video should work fine for you. Nothing to it.