Ultimate NTSC desynch answer when DivXing ?

[JazzMC]

hello !


I am so very fed up with people virtually everywhere reporting video/audio desynch when encoding NTSC DVD's , interlaced or not interlaced because there is no real answer ANYWHERE !

Why does the´video and audio synch get lost when ntsc DVD's are encoded ? and how can one make synchronous ntsc dvd divx copies ?

HOW THE xxxx ?

I have never seen any good answer, and I have done so much experimenting myself ... Somewhere, there must be an answer . Or someone who knows . Who knows a way even if the technicialities are not clear (WHY this happens), just a simple 'you gotta do this, then that ' and so on .

HELP !

Jan .

[MaTTeR]

Please go back and read the forum rules. No offensive language in the forums. No I'll edit it out.

It's hard to say why your having sync issues since we don't know what your video and audio encoding methods are. At this point we would be guessing?

BTW- I've ripped and encoded close to 350 NTSC movies without ever having a sync issue. About 2-3% of them are interlaced and they posed no problem either. So have you followed Doom9's guide step by step? If your using AC3, have you read the AC3 FAQ?

[JazzMC]

sorry for swearing. I read the forum rules, by the way, and I did not think that what I wrote was offensive . I still don't think so .

anyway, I would still be really happy if you could reply to this .
I use FlasK . but as I said, there is this prob with almost all other progs .
I usually use DivX 3.11 , Radium MP3 codec , and the problem occured with 44100 and 48000 herz . then the MMX idct .
As I said, the audio is just shorter than the video .
With normal NTSC dvd's, I use 23.976 fps and click on 'redo progressive images' , and then there are no problems . with interlaced NTSC DVD's, this does not work . neither does using 29,9 fps and deinterlacing .

Yes, I have read many of Doom9's guides, but I have so far not seen one that explicitly deals with desynch probs when NTSC'ing . There are guides to redo the synch, but htis doesnt help either because with this special DVD, I have to encode each vob file on it's own and then append them (or encode 2 at once and then cut something out, which gets the same result : the audio that was synched gets unsynched again, because even when resynching, the audio traxck is not made fully the same length that the vidoe is) .

I mean, if you did so many NTSC rips that worked, there must be some easy settings that allow to have no desynch .
And I do not want to use AC3 , btw . I would like to stick to MP3 .

Hope this wasnt offensive, and that you can still muster the will to reply to this even if I went against one of the forum rules .

Jan .

[JazzMC]

just thought of something .

I dont know if you have seen many questions about synch and stuff and see the need for explanation (which is probably why I used the words I did, out of personal rage against not being able to do something although the explanation must be so simple but somehow, nobeody knows it that I found so far) , but I am a frquent 'doctor' (in fact, not wanting to brag here, just to show that I am not a newbie and that I have been working with DivX and related matters for 2 years now, and still havent found an answer, I am the one in there that replied to the most questions) in the dvd.box question section, and the 2 most asked questions are probably :
how do I make my drive regionfree &
why do I have desynch in my videos ?

how about a guide to, expressedly, the following : how and when does audio desynch happen, listing all possible cases, and how to counter it ? that would help a great many people, and then I would finally have something to link to when answering to the questions I could until now not answer .

Jan .

[Doom9]

the main thing here is that most of us don't use flask as it's crap.. follow one of the gknot guides and you'll have no problems.. I did over a hundred TV episodes and countless movies like that.. without ever having any synch problems. I know in fhe flask days that was an issue but that's just another reason not to use it.

[JazzMC]

if that should really work, I will forever shout your glory .

I will download the prog and try it . I have read the guide once and it seems to be a bit more complicated that flask (flask is not crap, not entirely . if you want nice smooth picture and good deinterlacing ((at least with PAL DVD's , and I happen to be German)) and not much work, it's great . I have started to make audio externally with cooledit, but the video I will also furtheron make with flask . as I said, its only that one kind of DVD...)

what I also wanted with that post was to know WHY this desynch happens . I mean, why either the video gets longer or the audio shorter . because this does not seem limited to flask . really not .
as I said, every second or 3d question I have seen was about desynch (not here) .

and it would please me no end to be able to tell those poeple what they can do to stop this happening . I know that the dvd.box.sk dr.divx forum is not nearly as good as this, but I like giving a bit back for all the help I have gotten over the last 2 years, because ele I would be as helpless as many that write there . it's more for newbies than for pros . I don't consider myself to be one of the latter, but I do know lots of stuff that can help the starters .

one last thing : I was amazed to get one reply, much less 2 of them . my last post got viewed 80 times or so, and noone bothered . and I still don't know the answer (was about SVCD's).
it's good that places like this still exist, where Osiris himself comes down to bless a little nile peasant .

Jan .

[MaTTeR]

To answer your question...Flask is most likely the culprit:angry: It really is a crap encoder and you should try the Gknot guide for encoding.

EDIT- Doh! Doom9 already beat me to it:)

[JazzMC]

well, I figured myself that flask migth be to blame, but I want to stress this again : I have seen so many questions on desynch that I am getting sick of them, and not all of those poeple use flask .

I really would like to know what CAUSES audio desynch, at a technical level . why does it happen with some progs (or better, AC3 decoders, as flask must have one in its system) , in some framerates, and not in some others ?

I might be missing something obvious here, but I do not think this has been answered yet .

by the way, to anger all of you nice people even further : a friend of the guy I borrowed the DVD in question from, which I encode for yet another friend that I have never seen (long but interesting story there, if you like anime, or even saint Seiya, I can only say that all 4 films will be online sonn IF I GET THIS STUFF TO WORK), has given me a tip that will prbably enable me to continue using flask, even with interlaced NTSC DVD's it seems .
a prog called audiodec it was he gave me, and that did produve an audiotrack that matched the time I still have in mind from the video encoding . I will have to encode again tomorrow (as I deleted all my previous work on that DVD, as I was a bit angry), but it seems as if this will work . this would mean that the internal AC3 decompressor in flask has some troubles with said DVD's .

I might be old-fashioned, but I quite like flask .

I did download gknot (all 6,5 MB of it, and that with my old 56k modem) and read all about it on doom9's site and gave it a bit of a try, but it is so much more work in setting up ... but I think from all I have read that the encoding tiome will probably be shorter than in flask . I will also give this a try, maybe even tomorrow .

the only thing i found missing was, curiously, the deinterlacer . I read through the part where doom explains NTSC/FILM versus PAL and what to do when the content is interlaced, but in the case of interlaced normal NTSC DVD's, hge does say 'use no filters here' which i find quite worrying, as the preview in DVD2AVI clearly showed black lines .

anyway, i am ramblinbg again . don't stone me yet, I might yet become famous :-)

Jan .

[MaTTeR]

Why don't you prove yourself wrong and do as Doom9 suggested? Try the Gknot guides and audio guides. I assure you they work fine and no more questions will be needed about sync issues.

One more time...Flask is very very nasty.:D

Good luck!

[JazzMC]

hello !

thank you for all the help you have given me, I appreciate it .

you can delete this offensive topic now, if you want :-)

I will try gordianknot with the next full feature film DVD I want to encode .

Jan .

[MaTTeR]

JazzMC,

Your post wasn't really all that offensive, it was just one word. So I'll edit it out;) Were trying to cut down on the cursing.

Good luck with Gknot, I'm sure you'll be happy.