Problems with "too many frame drops"

[popo]

I have a divx avi and I have tried for days to get it as good quality as I can and for it to be the right aspect ratio.
I can get it to REALLY great quality by setting the Q-min and Q-max to zero. And the aspect ratio I do it manually by chossing dvd 16:9 and making the top and bottom 54. I use DVD ffmpeg and can't use the quicktime part.(can't get it to play in QT no matter what)
But when it is supposed to make the vobs it fails and says too many frame drops...
I have tried with the Qmin and max up like 2 and 20 and and once at 2 and 10 it seems to work but the quality is awful and not worth it and it skips alot.
The original is a divx avi 23.98 fps with ac3 stereo I have tried muxing after making a new mp2 from the original but no matter what it won't mix the two.

PLEASE--What is going on here, Is it because the orig is 23.98? Does it sound like the new .mpv is the problem/why? Is it my settings on Qmin and max? What would cause the video and audio to change and not be able to mux?

PLEASE PLEASE PLEASE ANYBODY HELP ITS DRIVING ME CRAZY.
Thank You for your time...

[alph]

It's most likely because your final framerate is 23.98 and you've not used pulldown. The failure is at the muxing level.

Try using the pulldown tool first to fake a framerate of 29.97. For pulldown, you need the video stream alone, either the m2v, or an mpv file you rename to .m2v, and then use the pulldown tool on it. Once you have the pulldown version you can mux it with your audio and author it if needed. FYI, pulldown is not as fast as you'd expect, but it's not long.

Alph

[popo]

Thank you for responding--by pull down you mean just choosing 29.97 in the framrate options or is there another thing that you are talking about? What is the 3:2? Does this have anything to do with this?
And just use ffmpeg? And the plain audio ac3 or mp2 should mux after this?

THANK YOU SOOOO MUCH!!!

[popo]

The pulldown didn't help it still says too many frame drops...should i just redo it and put 29.97 when i encode it??

Thanks

[alph]

It's called 3:2 pulldown.

If you encode with ffmpeg, you have to use the pulldown tool after you've encoded at 23,97 to make it 29.97, before manually muxing with the audio.

If you encode with mpeg2enc, then you can enable the 3:2 option when encoding at 23.97, but do not enable pulldown if you are encoding at 29.97.

Alph

[Nelson37]

Read up on 3:2 pulldown.

It does not actually change the framerate, but instructs the playback device to construct one additional frame for every four, resulting in an effective framerate of 29.97. The fourth and fifth frames will be interlaced. This process is called Telecining, the video you have now may have started out as film framerate (23.97), or may have been Inverse Telecined to get back to that framerate.

Basically you run a prog called Pulldown.exe on the .M2V file, this will create a Pulldown.m2v which is what you mux with your audio. The original .M2V file is unchanged and should not be used.

[popo]

Thanks everyone, but i did the pulldown and I am still getting the same failure when i go to mux.

[Nelson37]

Try the same process with a file known to be correct. If your only source is downloaded files, this will not be possible. In that case, try several different files to see if the problem is systemic or just with this one particular file. Many downloaded files are irreparably corrupted. The Divx playback may mask this to where it is not visually apparent.

[alph]

Well at this point a re-encode at 29.97 might be the only choice. It should either mux at 23.98 or with pulldown. If it fails due to frame drops in both cases then I'm not even sure re-encoding will solve the problem. The concern with going from 23.98 to 29.97 is audio sync loss.

Other options:

-Split your movie in 2 or 3 pieces, encode, mux, and join the mpegs with MPEG streamclip.
-Try running your orignal avi through one of those Windows based AVI "fix" utilities which correct AVI index problems and then re-encode.

Alph