audio sync problems: osex, mediapipe, sizzle/dvdsp

[thr33ve]

Alright i'm to the point of frustration here. I've ripped a movie as m2v and ac3 files using osex. i then encode the video to a lower bitrate using media pipe. then i use sizzle to create a new image. the audio starts out fine but by the end of the movie the audio is ahead of the video. i tried dvd studio pro, same result.

i tried to reencode the video several times using different settings for mediapipe, including 3:2 off and on, ntsc video, ntsc film, various levels of vbr and quantisation factor, and with the same result EVERY time. What am i missing here that could cause this problem?

I have also tried making a 3ivx movie using diva to encode the video, then a52decx to create aiff audio, and quicktime pro to make it a single file.. in this case the movie is perfect. so my problem must lie in the settings for encoding the m2v to lower bitrate? any input is appreciated.

thanks

[galactica]

What is the fps of your source?

"....i tried to reencode the video several times using different settings for mediapipe, including 3:2 off and on, ntsc video, ntsc film, various levels of vbr and quantisation factor, and with the same result EVERY time. What am i missing here that could cause this problem?"

NTSC Video and NTSC Film are two different settings for frames per second. You HAVE to know which one the source is otherwise it will never sync!

Typically, my experience has shown me, that if its a NTSC DVD it will have to have 3:2 ON and it is NTSC FILM!

Try using ffmpegx instead of media pipe. Although media pipe works, its not easiest to use in my opinion.

Likewise, can you extract to .vob instead of individual .m2v and .ac3?
ffmpegx will do single processing of the .vob with better sync results if you have the correct settings.

give me sore more info on the source (dvd name, what settings OSeX tells you the movie is encoded at? if its a dvd-r, commercial DVD or from somewhere else) and ill try my best to help you out.

[thr33ve]

galactica: thanks for trying to help, i'll do my best to give you the most relevant information.

the movie i'm trying to backup is The Count of Monte Cristo. It is a commercial dvd. The info i get from osex is 5.9GB, 2:11:06.13 duration, 29.97 fps, M2V 16:9 NTSC 720x480. From what i've seen on the forum this is what i would see for a movie in ntsc film with 3:2 enabled? I did notice in my osex options that the "set broken gop flag" is checked. is this the default because i do not recall enabling it? keep packet headers and pes headers are both disabled. perhaps this is my problem?

tonite i am going to try ffmpegx to see what results that gives me, then i can also try ripping to vob instead of element streams tomorrow.

thanks for your help

[qshartle]

DONT TRUST OSEX

IT LIESSSSSS!!!!!

every dvd it says is 29.97

but in reality, its not



3:2 works sometimes, but rarely, and for Monte Cristo.....it wont



Q

[aimbuster]

I, too, have ripped that movie's main track into a single 4Gb VOB file. I then used ffmpeg to convert it to MPEG4 DiVX using the "Quick Preset > DiVX (NTSC)." This uses the mencoder codec that doesn't have sync issues. I've tried doing the MPEG2 using mpeg2enc preset once and it was out of sync.

[incredible]

It is a commercial dvd. The info i get from osex is 5.9GB, 2:11:06.13 duration, 29.97 fps, M2V 16:9 NTSC 720x480. From what i've seen on the forum this is what i would see for a movie in ntsc film with 3:2 enabled? I did notice in my osex options that the "set broken gop flag" is checked.

The option set broken GOP flag has nothing to do with your sync problem!
GOPs are Group of pictures and its the structure of the video stream.

Your problem is (as mentioned already) the 3:2 Pulldown!

There are two ways commercial DVDs are encoded:

1) a 23,97 Movie Encoded with aprofessional Pulldown where Frames are added correctly during the whole movie, the result is a encoded and recognised 29,97 FPS Film

2) Encoded with 23,97! and a Pulldown flag in the header set, so the 23,97 Movie will be recognised as 29,97 but still played back at 23,97!

I your case thats why OSeX says 29,97 cause it only reads the header of the movie! So OSx doesn't lie! It only shows what the header says.

Just make a 10 min - test movie by choosing the encoding FPS at 23,97 and 3:2 Pulldown option checked. In many cases this works!
If not try 29,97 and 3:2 not! checked!

Markus

PS: I'm working on a SYNC-PDF Manual where everything is explained and where you can find all solutions to keep your movies in sync.
But I'm german and my english isn't that good so if someone helps me to correct my english words ... it would be great!

[thr33ve]

ok, before i get flamed let me try one more time to see if i can get this straight..

i have tried the following, all with the same result

1) 23.97 (ntsc film) with 3:2 option checked
2) 29.97 (ntsc video) with 3:2 option unchecked
3) 23.97 (ntsc film) with 3:2 option unchecked
4) 29.97 (ntsc video) with 3:2 option checked

Each time, the audio is fine for approximately 30-45 minutes, then it starts to get noticeably out of sync until by the end of the movie is several seconds off. Making a short test clip 10-20 minutes won't help me with this problem because it isn't noticeable until further into the movie. Having tried the 4 possible combinations of fps and 3:2 I must conclude that there is some other option i have overlooked or possibly an error during some part of the process, or even a bad rip from the dvd? As you can guess i've spent a lot of time trying to reencode this movie and i won't give up yet! And i did get the same results now using ffmpegx as mediapipe, using 23.97, 3:2 checked, will try it again tonite with dif settings.

incredible: your english seems very good to me. better than a lot of native speakers but if you want i'd volunteer to proof read your manual. It may give me a chance to learn about this subject more.

thanks

[incredible]

Each time, the audio is fine for approximately 30-45 minutes, then it starts to get noticeably out of sync until by the end of the movie is several seconds off.

Well, if you load the orig DVD into OSX look under "TI" (I think) al the FPS of the tracks on the DVD.
I think one of them got a differend FPS value than the others!
Is the DVD "Montechristo" a movie or a documentation, assembled from differend sources??!!!!!

If yes rip the Tracks seperately!