25 PAL to 23.976 NTSC AVI

[Nedward Orton]

I know forum regulars (in general) hate it when some guy gets on to ask what is potentially a stupid question, but I've been researching for a couple of days now and this is my last option. Can someone help me get a 25fps PAL down to 23.976 NTSC avi with Avanti? I know there's a way, but I haven't quite hacked it. I tried three times and got no sound. Also, Divx or Xvid please!

Thanks.

[Nedward Orton]

Uhm....bump

[Selur]

Never used Avanti, but you probably have to slow down the audio&video, and from what I see from the screenshots Avanti can't slow down the audio,... (MeGui and probably other tools should be able to do it, if properly configured)

[Nedward Orton]

Then does anyone have the definitive method using Megui? From what I've read, everyone's method is wrong/does not work.

[hech54]

That's because conversion between NTSC and PAL is hardly ever recommended by anyone....it is almost discouraged. It's not easy and the results after much effort usually look like crap.

[Selur]

I theory the easiest way would be to do a simple slowdown (slowdown audio & video by a factor of 25/23.976) and reencode.
Only 'problem' there is to adjust the audio pitch a bit.
All in all I did it a few times without a problem with Hybrid, but I dropped .avi output support in Hybrid due to a bug in ffmpeg which Hybrid uses for muxing.

It should be easy for someone who knows how to uses MeGui to:
1. add an 'AssumeFPS(23.976)' to the avisynth script to change the video fps
2. configure the audio to do a 25->23.976 slowdown
haven't used MeGui in years, but this wasn't hard a few years back.

Cu Selur

[hello_hello]

What are you starting with, a 25fps AVI or a PAL DVD? Aside from the frame rate, an AVI isn't really NTSC or PAL, so converting from one to the other isn't a problem.

If you're starting with an AVI, it's easy enough to open it with something like VirtualDub, change the frame rate, and then resave it. The problem is the audio needs to be resampled to match. MeGUI's audio encoder has PAL to NTSC etc options when configuring it, and as mentioned above adding AssumeFPS(23.976) to the script MeGUI creates should get it to encode using a 23.976 framerate.

[jagabo]

For DVD, if your PAL video is progressive there's no need to change the frame rate at all. Resize to 720x480 and encode to 25 fps progressive MPEG 2. Then use DgPulldown to add pulldown flags for 25 -> 29.97 fps. This does not change the running time so no changes are required for the audio.

[Calidore]

I've done this a lot in VirtualDub, and it's a piece of cake. For the video, just go to Video | Frame Rate and set it to 23.976 and "Process all frames". Then to Audio | Use Advanced Filtering, load the Stretch filter, and set it to 1.04271. That's all there is to it.