FPS Not working properly?

[czucker]

Hey,
I've tried re-encoding a few AVIs to MPEG2 (DVD profile) that are at 24 fps and they're not being converted to 30fps.

I've set the pulldown menu properly to "NTSC (29.97)" and each time I get a resulting MPEG file at 24fps.

This is what I get in the terminal. You'll notice the output specified is 23.98fps. Is this a bug? Anyone else having this problem? This didn't seem to happen with 0.9s.

Welcome to Darwin!
Christopher-Zuckers-Computer:~ chris$ /Applications/ffmpegX.app//Contents/Resources/pbpaste | sh
Encoding started on Mon Aug 29 06:42:04 EDT 2005
ffmpeg version CVS, build 3211265, Copyright (c) 2000-2004 Fabrice Bellard
configuration: --enable-mp3lame --enable-gpl --disable-vhook --enable-ffplay --disable-ffserver --enable-a52 --enable-xvid --enable-faac --enable-faad --enable-amr_nb --enable-amr_wb --enable-pthreads --enable-x264
built on Aug 14 2005 14:46:34, gcc: 3.3 20030304 (Apple Computer, Inc. build 1666)
Input #0, avi, from 'MyMovie.avi':
Duration: 01:54:49.6, start: 0.000000, bitrate: 851 kb/s
Stream #0.0: Video: mpeg4, yuv420p, 560x304, 23.98 fps
Stream #0.1: Audio: mp3, 48000 Hz, stereo, 64 kb/s
Output #0, dvd, to 'MyMovie.mpg':
Stream #0.0: Video: mpeg2video, yuv420p, 720x480, 23.98 fps, q=2-20, 2220 kb/s
Stream #0.1: Audio: ac3, 48000 Hz, 5:1, 448 kb/s
Stream mapping:
Stream #0.0 -> #0.0
Stream #0.1 -> #0.1
Press [q] to stop encoding
frame=30357 q=0.0 size= 365184kB time=1266.1 bitrate=2362.8kbits/s

[adamantius]

I'm having a similar problem. I wonder if perhaps the script ffmpegX uses is defaulting to the NTSC Film framerate of 24 fps for some reason. What this means in practice is that when you choose NTSC when using ffmpeg for a DVD, you may have to encode the video only as NTSC Film (ffmpeg seems to do this whether you choose NTSC Film or Video), then run the pulldown function (remembering first to change the file extension of your mpv to m2v, because as I recall, the pulldown tool doesn't like the mpv extension and prefers m2v) to get a pulled-down 29.97 fps. Then you encode your audio, mux, author, etc.

It works perfectly well, but it's a little cumbersome in this one particular aspect. I love ffmpegX!

[Scav2003]

I've also had the same problem...plus a 29.97fps keeps getting changed to 24

QUICKTIME 7 id's the video as:

Generic MPEG-4, 640 x 480, Unknown
MPEG Layer 3, Stereo, 48.000 kHz
FPS 30
Playing FPS 30

I see this in the process from ffmpegxt (but it seems to be the output stream, given the size)

Stream #0.0: Video: rawvideo, yuv420p, 352x240, 23.98 fps

This is using the VCD FFMPEG preset, though I had to manualy change the size to "VCD", as it keeps trying to default to 16:9

[microcuts777]

I've been emailing major back and forth about this,

He said that they were looking into this problem. I'll let you guys know as soon as he gives me some new information...

[Scav2003]

any word on this?

[major]

Download 0.0.9t r4 at http://homepage.mac.com/major4/ffmpegX.dmg which should fix this.

[Scav2003]

I tried it out, and it had the same problem (I was trying it with ffmpeg svcd preset).
Further, afer like the first half second, the video froze, while the rest played fine.
I sweitched back plain .9t and it worked ok (the frame rate problem was still there, but the video played ok)