Help me DSPguru, please!!

[framerman]

This audio encoding is driving me nuts. I ripped my movie in DVD decrypter, stripped and corrected in IFOedit, then I took the main movie files and split the audio and video in DVD2AVI. Out of this I get d2v's and ac3's with the audio correction in the title of the audio file. I place this file in BeSweet GUI v0.6 b61 and check box the place where it says DVD2AVI. I reencode the ac3 with the audio delay and get my corrected ac3. Now from here I have the problem. The sound starts off on every VOB I have just great. It slowly falls behind the video so I'm about 1 second off at the end of the VOB. Now I've read all the threads in here and it seems there are a couple of methods to go by here. One is to compress the audio so I have one second less than before. I have tried appending the audio and it doesn't append any amount that I notice. I have tried both pluses and minuses to make sure I'm going the right way with this. I am still 1 second off. I have also seen in here to change the frame rate. I have tried this with the same results. Nothing changes from the original file that I wanted converted. Now the strange thing is that I tried to reencode my original ac3 file to a wav format and there seems to be no problem with the one second lag. What I would like to know is a couple of things. First, what do I have to do in BeSweet to make this one second delay work correctly. I'm assuming I am overseeing some check box or something. Second, what I am trying to accomplish is to reencode my DVD-9 video to fit onto a DVD-5. I think I read somewhere that DVD's need an ac3 file at 384 kb to play on stand alone players. Do you know if this is true, OR can you encode an mp3 in say 192 kbs and mux this with your m2v file to make a VOB? I would really appreciate your insight on this.

Framerman

[framerman]

Alright, now I have downloaded ac3machine from the website and tried that. I reencoded the audio by changing the frame rate. Now my question is what programs do I use to find out exactly how long my VOB file is in minutes and seconds and how do I figure how much the frame rate of the audio needs changing.

[Trahald]

ac3 delay issues would cause an even sync issue through the whole film. is the audio slow (sounds come after an action - or is the audio fast (sounds come before the video). if the audio is fast, watch your gain settings.. if they are too high the cliped samples get dropped making the audio shorter (and therefor fast)... or maybe its something else.. but the delay doesnt seem to be the issue

[framerman]

The audio is slow. It comes after the action. Right now I am just doing trial and error as to the frame rate adjustment. The other issue is can I encode the ac3 audio lower that 384 to gain me a little more room for better video encoding?

[framerman]

The update to my problem. I have trial and errored this thing to death today. I have found out that I need to adjust the frame rate from 29970 to 29980. Now the strange thing is this. I was trying to reencode at a frame rate of 29978. There was no audio that came out. It also encoded really, really slow. I mean like 5 times slower. I am about roughly real time encoding of the audio at 29980. The 29980 rate is just a fuzz faster than I wanted. So I tried 29979. What I got was a whole bunch of noise. Everything that I encoded after 29980 was perfectly fine in quality. Everything under produced no audio whatsoever. I would really like to encode at the 29979 speed if anyone can tell me why it comes with so much distortion and noise and how to fix it. Have I done something in DVD2AVI on a setting that I missed? I saw some threads that stated I must force FILM to 29.97, but my DVD2AVI (v. 1.76) doesn't have this setting. It has force FILM of 23.976 or 24. I am at a complete loss as to why all of my DVD's are lagging in audio. I would just rather fix the problem at the source than fix the audio so much. Can anyone help?

[dannyv]

Originally posted by framerman
-I have found out that I need to adjust the frame rate from 29970 to 29980.

- I saw some threads that stated I must force FILM to 29.97, but my DVD2AVI (v. 1.76) doesn't have this setting. It has force FILM of 23.976 or 24.

-I think I read somewhere that DVD's need an ac3 file at 384 kb to play on stand alone players. Do you know if this is true, OR can you encode an mp3 in say 192 kbs and mux this with your m2v file to make a VOB?



First off you never want to encode using an off bit rate. Doing this you will never be compatable with standalone players. In DVD2AVI you want to force film to 23.97. This will allow for transcoding in rempeg or tmpgenc at 23.97 (internally 29.97). I have never gotten a good audio sync from tmpgenc so you may want to try using rempeg. Every transcode I've done using it has always had good audio sync.

As far as audio most dvd's are 448kb you should leave the file as is after using dvd2avi.

The process is pretty simple.

1. Decrypt it using dvd decryptor
2. Use dvd2avi to demux
3. (Optional)Use Infoedit to get rid of the streams you don't want.
4. use rempeg to transcode (will eliminate audio sync problem)
5. use infoedit or dvd maestro (my choice)to author and re-mux