CCE + assumefps(25)
 

Hi,

Yesterday I experimented a bit with cce, as its much faster than tmpgenc and seems to provide better quality for mpeg2.

I was making a test run with an avi file, using the optimal v4 script. As the avi file is 23,976 fps and I need PAL, I add the line AssumeFPS(25) at the end of the script.

The result was a movie which length was decreased by 40 minutes 8O . I can't see what I'm doing wrong. I've used this before, but this was with tmpgenc as encoder, and gave me no problems.

I'm using avisynth v2.52 and cce v2.67.

Thanks in advance!

Youre doing everything right as pitching up the framerate using assumefps(25) means a faster playback which results in a final shorter movielength. This PAL speedup is done mostly by all broadcasting stations when doing the 23.976 to 25.000 fps.

But just a assumefps(25) will bring your movie out of sync, so do add at the end of your Optimal V4 script this:

assumefps(25,true)
SSRC(44100)

If youre going to make a KDVD do change the 44100 to 48000 !

hi Inc,

I would espect a reduction by at most 7-8 minutes when speeding a 2 hour movie up from 23,976 to 25 fps, as my previous encodes with tmpgenc also gave me that result. Isn't 40 minutes too much?

I always thought I should only use this when also feeding the audio through avisynh, so i always use :

I speed up the audio using besweet, or in some cases cool edit pro.

Is this the right way, or is it better to use the code you suggested?

Thanks!

It depends on which audio codec is used in your avi container, so if a decoding codec is given by the system, you should try as Besweet would do the same when doing a 23.976 to 25.000 conversion. It pitches up and resamples to the wanted final khz audio rate. Besweet btw. also uses SSRCs library.

But youre right, when doing the audio encode in Besweet, you do gain from the best free mp2 encoding engines like mp2enc or 2lame (DSP Guru recommends mp2enc btw.)