more a/v synch issues

[swim2383]

ok, i used AC3 Corrector for a while but since you can only correct the DELAY stated by DVD Decrypter by intervals of 32ms ... well its still off and even as small as a few ms bugs the hell out of me. i have recently been using ac3machine to correct the delay but it also transcodes the whole ac3 and it is always about half the volume of the origional file... which is almost worse then having the sound be off by a few ms...

is there anyway to correct the a/v synch AND keep the same volume in the origional ac3?

if not could someone with more knowledge then me make a progie to do this ;p

[FilipeAmadeuO]

Try AC3 delay corrector

[swim2383]

sorry "ac3 corrector" was suppost to be ac3 delay corrector

[JOJOLINO]

"but since you can only correct the DELAY stated by DVD Decrypter by intervals of 32ms"

I can't understand this...???
You can correct the delay with 1 ms steps in AC3 delay corrector.

If you author the movie with maestro, this prog can correct delays of AC3 streams by itselfes.

[swim2383]

??

i was under the understanding that ac3 delay corrector only corrected by intervals of 1 frame (32ms)...

how do you correct by the exact ms?

in the progy you enter the ms the delay you want and then it rounds it to the nearest frame... is there some other way jojolino? if so how?

any info would be great, thx
cure

[JOJOLINO]

You're right!!!!
Sorry, I've only noticed the fieldname "ms", but the proggie cut's frames!
For me it is ok.
I ripp only german language streams in american movies. So the synchronisation are not so exact, that I can notice a big difference between the lips and the spoken words.

JOJOLINO

[mikecito]

You could always decode to 6 waves, and reencode after clipping the sound's start point in the waves. Wow - sounds like a lot of work to get down to the ms. Hmm....

[framerman]

I'm not sure if this will help. In ac3machine, do you have a check mark in the box labeled "use dialog normalization reduction"? If you do, this will take the softer parts of the movie and make them louder and at the same time take louder parts and make them softer. This could explain your volume loss.

Also BeSweet is a much more complex audio corrector than just about everything out there. There is also cool edit pro, but I don't know much about it.

Ac3machine and BeSweet will redo the audio file in 1ms intervals, and then give you a new file that you can import into your authoring software. It should sync up. Are you authoring dvd's? If so, have you tried in ifoedit? This program syncs up for me very well over the others I've tried, and it is much easier to learn to boot.

[swim2383]

i've found the process that gives me the best results with the least amount of work is to cut out frames until i get a positive delay then load into maestro and zooming in so i can movie the audio left and right and just creat the proper delay that way (as described by matthew)

[oddyseus]

u r just lowering the 32ms intervals to 25ms intervals. However in Maestro u dont have to correct anything. It takes the embedded timecode in ac3 and aligns it with videos. U wont notice any difference in the 80ms commonly found in demux these days.

[Matthew]

Originally posted by oddyseus
u r just lowering the 32ms intervals to 25ms intervals. However in Maestro u dont have to correct anything. It takes the embedded timecode in ac3 and aligns it with videos. U wont notice any difference in the 80ms commonly found in demux these days.

Well with re-encoded video streams I've *always* had to do my own adjustments.

Like I say in my first post here:

http://forum.doom9.org/showthread.php?s=&threadid=20433&perpage=20&pagenumber=1

For positive delays just drag to the right in Maestro. For negative delays cut the smallest number of frames required to make the delay positive, then drag by that much to the right in Maestro. e.g. with a file with -10ms delay - just cut off one frame to get a file with +22ms delay, then drag by that much to the right in Maestro.

[TRILIGHT]

No adjustment is necessary if you're following the methods in the full backup guides.

[<Aussie>Twodogs]

Hmmm i'm just a newbie here and from what iv'e read in this post i presume your trying to synch your sound with your video in maestro ?.
If so you just right click on your imported audio file and select synch audio and it create's a synchonised audio file.
Ahh if your talking about something esle my apologies in advance.