NTSCFilm / NTSC -> Keeping sync !

[timbo22]

Im trying to use ffmpegx to reencode Region 1 DVDs to fit on DVD-R. The problem Im having is that it seems like almost all R1 DVD have some 29fps film mixed in the beginning of the movie (which is 23.976 fps everywhere else). When the movie is then reencoded in ffmpegx (or transcoder or bitvice or antyhing for that matter) at 23.976 FPS with 3:2 pulldown, the video falls a second or so behind the audio because the beginning 29fps video is now playing at 23.976.

Anyone have any ideas how to fix this?

[earlygrace]

Dude I am having the exact same problem with Pulp Fiction, so what I am doing now is extracting each chapter seperatly, but I skipped the first chapter which is the stupid Miramax logo, I think that is the chapter that is cause the sync to go out, I tested chapter 2 by extracting and encoding it with FFMPEGX, then running it through Telecine to fix the speed it plays at, then adding the audio in DVDSP, and the sync seems to be perfect. It is a longer process but it will be worth it if it works.
I am also going to try and make a still menu by capturing the menu image and building it in DVDSP. Don't know how hard this will be but it look staight forward enough.

What I don't get is no matter what I set the Bitrate in FFMPEGX to, I get the same size file at the end. I rip a M2V file from a DVD, say it is about 6Gb when I set the BitRate to 4000 I get a 2.5gb file, if I set it to 8000 I get a 2.5gb file. What is up with that?

[timbo22]

I was thinking of trying the same thing with the chapters. What are you going to do about the first chapter though?

I was thinking that if there was some tool out there to add a frames into a movie in the beginning, or a way to set a video delay in DVDSP, one might be able to fix the sync without having to do the above.

As for the ffmpegx size problem, I had the same one. Its not ffmpegx, its mpeg2enc (42 has the same problem). This is the primary reason that I stopped using 42 / ffmepg and instead switch to bitvice (which coincedentally produces imaculate output that looks identical to the original even at 4mbs!).

[KaiCherry]

As for the ffmpegx size problem, I had the same one. Its not ffmpegx, its mpeg2enc (42 has the same problem). This is the primary reason that I stopped using 42 / ffmepg and instead switch to bitvice (which coincedentally produces imaculate output that looks identical to the original even at 4mbs!).

Bzzzt!!!

forty-two could very easily be set to "do 3:2 pulldown" because all it does its set flags for players to handle it.

THE PROBLEM is that befor its done, with certain software players, it *causes jerky video and sync problems*

forty-two was written to *mitgate* syinc problems. I can also tell you that this "changing framerates" crap is really *not* happening...it is playback and encoders *misreading* the pulldown markers. if you analyse the actual stream, you'd see that infact the "framerate changes" aren't really happening.

When we were developing dvdmp, we put the famous "framerate changing, dual layer switching nightmare" Matrix DVD thru it.

Guess what? Never changed frame rates. in fact it has exactly 4 duplicated frames, end to end thruout the movie.

the later mencoders suffer from this bad "reverse telecine" code that counts the frames at the leadin and tryis to set/override the frame rate from that. Its usually very, very wrong, which is why mencoder transcodes, and anything that relies on the newer ones, go horrible out of sync.

-K

[earlygrace]

I was thinking of trying the same thing with the chapters. What are you going to do about the first chapter though?

In my situation the first chapter is not any of the movie yet, just the company logos. So it is no problem.

forty-two could very easily be set to "do 3:2 pulldown" because all it does its set flags for players to handle it.

KaiCherry, maybe you can ad a option to switch 3:2 Pulldown if people want it, I know this will make things more confusing and you are going for a clean easy to use app, also would be interested in having the option to end up with an ISO or a M2V and AC3 files, so that I can add chapters and so forth.

[bilestyle]

I was thinking of trying the same thing with the chapters. What are you going to do about the first chapter though?

In my situation the first chapter is not any of the movie yet, just the company logos. So it is no problem.

forty-two could very easily be set to "do 3:2 pulldown" because all it does its set flags for players to handle it.

KaiCherry, maybe you can ad a option to switch 3:2 Pulldown if people want it, I know this will make things more confusing and you are going for a clean easy to use app, also would be interested in having the option to end up with an ISO or a M2V and AC3 files, so that I can add chapters and so forth.

kai just gave a very solid reason why we DON'T have it setting the 3:2 pulldown flag. It doesn't help in ANY situation, the only thing it does is create sync issues and jerky video. Plain and simple, we not only want a simple program, we want a simple program that works.-- what would happen if a user selected 3:2 pulldown when the movie in actuality had the frame rate of 29.97 (video) then you would wait through a big chunk of the process and then it would die and you wouldnt know why... and it would be b/c mpeg2enc would crash out with the pulldown flag set when the frame rate of the video is 29.97, and then the end user would be like, why did this happen and they would claim its another "bug"-- i'd go on but i think this should prove our point.