Audio codecs in divx conversion??

[pizzamandk]

Can you guys recommend other good and modern and useful audio codecs in addition to mp3? I am going to convert some movies to divx and have had a real pain with mp3 (out of sync and stuff).

How about AC3 btw? Is it good?

Thanx.

[banjazzer]

AC3 is the audio as it comes off the DVD. So it's good, but big!

There is no need to have out-of-sync audio using mp3 with DivX. Outline your method and I might be able to suggest a fix.

[pizzamandk]

I use VDub for divx converting.

1. I choose start and end points.
2. Audio and video at Full Processing Mode.
3. Audio - I choose mp3 conversion and video Divx 5.0.2 at the appropriate rates.
4. I encode, but it comes out out of sync.

I have read about finding the beginning of out-of -sync periods, but my family life does not give me the luxury of extended and concentrated work in front of the pc. So I would go for the AC3, ADPCM or whatever there is instead of mp3 - if it continues to give me headaches.

Anyway, thanx for any adivce.

[banjazzer]

I use Virtualdub also. I used to use a similar process to you, but now I encode only the video with Virtualdub. I extract the AC3 with DVD2AVI (demux) and then convert the AC3 to ABR MP3 using HeadAC3he. This is then interleaved with the video using Nandub (a modified Virtualdub).

With both methods the audio and video have always been in sync, over several hundred encodes.

What I suspect is going wrong is happening before you get to the encoding stage in Virtualdub. In which case, you may get exactly the same problem with AC3 (or any othere audio format)!

How do you proceed before using Virtualdub? You are not using Smartripper 2.41 by any chance?

[pizzamandk]

I am not doing anything before encoding in VD...but maybe I should! How I see it, you extract the audio, convert to mp3 and put it back on....but could you please explaing how many and which progs you use? Nandub? Smartripper?

[banjazzer]

I rip the movie with Smartripper. Next I create a .d2v project file with DVD2AVI. I load this into Gordian Knot (which also acts as a front-end for Smartripper and DVD2AVI, as well as indicating the encoding bitrate), crop and resize, and then save an Avisynth script which will load directly into Virtualdub. Having encoded the DivX video part, I create a variable bitrate mp3 from the AC3 I extracted with DVD2AVI, using HeadAC3he. This I interleave with the video using Nandub.

[crahak]

Try audio, inteleaving, and in delay, put the proper value. You can usually sync audio that way. AC3 won't fix that. AC3 _can_ be better, but isn't necessarily, same goes for size. You could also use other codecs, but codecs don't fix sync/delay... Good luck