[MEncoder-users] Output variable framerate?

HTUME 20051111 htumenc at gmail.com
Sun Jan 22 13:54:36 CET 2006

2006/1/22, RC <rcooley at spamcop.net>:
> On Sun, 22 Jan 2006 13:35:21 +0900
> HTUME 20051111 <htumenc at gmail.com> wrote:
> > -ofps 24000/1001 for AVIs.
> > -ofps 24.000 for rawvideo .264.
> > this is for mp4box. It wont accept 24000/1001 or 1001:24000, and when
> > I use 23.976, it makes 23.975fps movies.

>Loren wrote:
>Wait, you're saying that because mp4box is .001 fps off, you're choosing
>to introduce .024 fps of error instead?

Sorry I touched send button before I finish writing.
On my Mac OSX, -ofps 24.000 makes easier to me, to find audio delay
influence of Delay frame cutting on QT7pro. anyway, I have huge to
learn about A/V sync on linux anyway.

>Anyway, I just submitted a bugfix to mp4box. It already contained code
>that's supposed to recognize 23.976 and change it to 24000/1001, it's
>just broken.

That's fine. thanks. I will try to build it by myself. plz pray for success;).

>RC wrote:
> Call me crazy,


> but wouldn't it be smarter to use -ofps 24000/1001 with
> -speed 1.001 to get exactly 24fps?   (you'll also have to resample
> the audio in the process)

Sounds me fine, (and audio sync could be tweaked on QT7pro).

> Of course, I would either fix the bug in mp4box, or use another tool
> without such a bug (perhaps mpeg4ip or see if lavf works).

-of lavf seems unreliable, but it's more than 1 month since last time I tested.

anyway, I try all suggestions, thank you.

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