Ntsc to pal and pal to ntsc avi conversion guide

[johns0]

Just wondering if anbody needs a guide to convert avi from pal to ntsc and the other way around without re-rendering the avi so you can encode the avi to mpeg without having to set any special parameters.My method takes about 10-15 minutes if anybody is interested.

[switch]

i'm interested

[Cobra]

I'm all ears! Well, eyes...

[ricky1756]

sounds good, where's the link?

[johns0]

Making changes.

[johns0]

Almost finished.

[johns0]

Check out my finished guide.It has tips on gradual and constant audio sync fix and mpg conversion added.

[absinthecarolinas]

Hey johns0,

This is a really good guide ! For so long I've been trying to change framerate/audio rate via encoding and then encountering sync problems that need fixing ... it never occurred to me to change the framerate with the file still in its original format.

A couple of points:

In step 1 of your guide, you might want to point out that the audio should be set to "full processing mode" before extracting it as a wave (or am I wrong?)

Then, in step 2, VirtualDub wouldn't show me a preview of the output with the framerate changed unless I said the video to "full processing mode." (But then, as you point out, you'll have to switch back to "direct stream copy" to save out the new file.)

This worked well and I didn't have to make any adjustments at all. I've been struggling with framerate conversions for a while now and I think I've picked up on something in your guide that might be worth pointing out. When making changes to the audio file, in the past I've always tried making all the changes in one swoop. In other words, if I had an AC3 file in a PAL movie and I wanted to put my movie on SVCD in NTSC format, I would demux the AC3 directly and try to run it through BeSweet making all the changes at once if possible.

1. sampling frequency to 44100 hZ
2. framerate 25000 to 23976
3. format from AC to MP2

In fact, I read in another forum that BeSweet cannot downsample the frequency and change the framerate at the same time. That might explain BeSweet crashing on me recently. Anyway, my logic was always: the fewer conversions, the less potential for quality loss. But perhaps that's not the case. I think that just extracting to a wave and making NO other changes, THEN changing the framerate and nothing else, and THEN finally converting the audio to your desired format/frequency might be the way to go. This is pretty much how it happens in your guide so maybe I'm preaching to the choir now .

So here I sit watching my newly converted AVI. It's of a piano performance and the musician plays incredibly fast with constant close-ups, so that audio sync is absolutely crucial. Now it's at an NTSC framerate and it's perfect, I tell ya, perfect. Now I can encode it for DVD, no prob

Thanks again,

-abs

[johns0]

In step 1 of your guide, you might want to point out that the audio should be set to "full processing mode" before extracting it as a wave (or am I wrong?)

You dont need to save the wav in full processing mode unless it a weird sampling rate such as 22 khz in which besweet will screw up on but thats if you are working with crappy files.Ill add a note in case someone tries to use besweet on a low sample audio file.

Then, in step 2, VirtualDub wouldn't show me a preview of the output with the framerate changed unless I said the video to "full processing mode." (But then, as you point out, you'll have to switch back to "direct stream copy" to save out the new file.)

I changed to preview playback button for virtualdub for seeing if the sound syncs right with the audio so you dont have to change to full process mode,thanks for the observation.With ac3 i use besweet to change to wav with only fps altered cause i use ffmpeg which will change the sampling rate to 48khz and bitrate back to ac3 but thats cause i burn to dvd but you are burning to svcd.
Glad you like the guide .