sound async

[MiaWallace]

It`s wiered!
I ripped the double DVD of "The Stand" using big3(old and new). I always get a video delay of about 1 sec.
The only solution seems to be DVD Shrink but the quality of the original stream is so incredibly bad, that i´m forced to use cce.

It`s the first time encountering such problems.
Any further hints?

[HyperYagami]

looks like you'll have to fix the AC3 manually unfortunately, either it has been correctly incorrectly or the correction didn't kick in for some reason.

[MiaWallace]

hmpf omg
That brings me to 2 new questions.

How to determine the exact value of the "produced" delay?

Which AC3 tool is best, to do this job? ...to add some silence in the beginning.

thx

[D3s7]

What version of DVDDecrypter / DoItFast4u! are you using? Is the audio ahead of the video?

you have a couple options for "fixing" audio delay.. both work just fine

one is the old standby ac3delaycorrector the other being jsoto's new app delaycut

[MiaWallace]

Using always the newest program versions...
DVD Decrypter 3.2.2.0
DoItFast4u! 1.4.7.0 yeah, I payed for this great tool :)


Right, audio is ahead of the video.

Delaycut looks promising, but how to find out the right delay-values?

[jel]

hi MiaWallace and welcome to the forum.

if your audio is starting before your video then you can alter the start time of the audio in scenarist:
taken from a post by Matthew:In Scenarist you can create a positive audio delay by changing the "start time to video" value for the audio. For PAL, 1 frame = 40 ms, so 5 frames, for example means a delay of 200 ms. The audio will start 200 ms later than the video.
the delay values are written into the file name of the audio stream when demuxed by DVDDecrypter - 'ifo mode' > 'stream processing' > 'demux'
eg .VTS_06_1-0x80-Audio-AC3-2ch-48kHz-DRC-English-DELAY 0ms.AC3
hth

j

[MiaWallace]

If it would be so easy :D

I used the big3 for about 50 times minimum, and believe me - these DVDs are different!
DVD Decrypter stream processing shows me only 80ms:
VTS_01_1 - 0x80 - Audio - AC3 - 2ch - 48kHz - DRC - English - DELAY -80ms.AC3

The ending up delay is far bigger, about 1-2 seconds. Thats not the trick is in this case...

[jel]

sorry MiaWallace, i am out of ideas.
in any back-up i have done that had audio synch issues, running ac3delaycorrector manually on the audio fixed everything.
so beyond manually adjusting the start times in scenarist till you magically synch the audio /video ... ?

one more question though. is the delay constant throughout the movie?

[Trahald]

Originally posted by MiaWallace
If it would be so easy :D

I used the big3 for about 50 times minimum, and believe me - these DVDs are different!
DVD Decrypter stream processing shows me only 80ms:
VTS_01_1 - 0x80 - Audio - AC3 - 2ch - 48kHz - DRC - English - DELAY -80ms.AC3

The ending up delay is far bigger, about 1-2 seconds. Thats not the trick is in this case...

Well. no matter how bad the delay.. if its uniform (meaning same amout of delay at the beginning as at the end of the movie) you can either add delay (1second = 1000ms delay) so 1000ms-2000ms delay.. there are occasional movies where the delay doesnt match.. i'll try to buy the stand and comment back

might be a slide show cell at the beginning of the video causing the prob. who knows


im R1.. hopefully its the same across regions (unless you are R1)

[Matthew]

@Trahald, the -80 ms delay = PAL DVD.

[MiaWallace]

Matthew is right, it`s the german PAL multilanguage edition.
english/german/spanish audio tracks are included.

@jel
Yes, the delay stays constant.

[D3s7]

Whoa Whoa.. back up....

are those the file names in your directory? VTS_01_1 - 0x80 - Audio - AC3 - 2ch - 48kHz - DRC - English - DELAY -80ms.AC3

If so, doitfast4u isn't renaming them thus not correcting the dealy thus your problem....

[MiaWallace]

No beware ;)
VTS__01_P01-80-192K-[-80]ms(fixed)-ch2English.AC3 < thats in my working dir

The other ones were just a test with DVDdecrypter...

[Trahald]

I had a look at the ifo and it appears to be a slideshow cell at the beginning of the movie pgc..

[Ch 01] [Pg 01] [Cell 01] [V/C Id: 1/1] : time: 00:00:10.00 / 25 fps [Pos: 00:00:10.00] [Frames: 250]
[Cell 02] [V/C Id: 2/1] Layer Br.: time: 00:06:33.15 / 25 fps [Pos: 00:06:43.15] [Frames: 10090]
[Ch 03] [Pg 02] [Cell 03] [V/C Id: 2/2] : time: 00:04:16.16 / 25 fps [Pos: 00:11:00.06] [Frames: 16506]


The slide show throws off the audio because even though it shows in ifo edit as 250 frames(i tested it myself with scenarist and ifoedit - ifo edit reports the frames based on framerate x duration.. not real video frames) So its really just one slide show frame so it ends up being encoded wrong (cce only sees it as 1 frame which really isnt its fault.. it truely is one frame) this throws the audio off badly since the audio still exists with a true duration.

solutions
1. vobid demux - bleh.. honestly too much work for a tiny issue. would involve starting over.

2. use dvd decrypter or smartripper on origional dvd or image. in ifo mode deselect chapter 1/cell 1. then go to stream processing. and demux your audio(s) making sure demux is selected. they will now not enclude the audio from 1/1 that was causing async. correct the delay reported in the filename of the new ac3s (if any). add 32 ms to whatever you get to compensate for the single frame 1/1 (meaning -100ms delay you would enter -68.. or if you had +64ms then use 96ms. substitute them in scenarist with the other audios. and recompile

id go with 2. i used smartripper to test and it worked (dvd decrypter didnt like the tiny test dvd image i made)

[Matthew]

I'd probably modify the avs and add 249 frames (10 secs x 25 fps -1 )of black to the beginning, re-encode required of course.

You could also create aforementioned dummy blank clip and loslessly merge it with existing m2v.

Accuracy of chapters and subtitles is also an issue, btw.

[Trahald]

Originally posted by Matthew
I'd probably modify the avs and add 249 frames (10 secs x 25 fps -1 )of black to the beginning, re-encode required of course.

You could also create aforementioned dummy blank clip and loslessly merge it with existing m2v.

Accuracy of chapters and subtitles is also an issue, btw.

matthew - definately true...

the dummy slip sounds like the fastest thing to do. scenarist has the import multiple item option (New->MultiFileData while in the Data Editor) which will let you import the blank clip and movie as one assett. it makes a pointer file with extension .cfx . I would import this as a seperate assett. then select your origional data file for the main movie in the data editor. Then in the Property Browser area select File[...]. and browse to the .cfx file and select it. then right click the same thumbnail and select data->place holder and then rightclick again and select place holder->data. and that should do it. that way you dont have to rebuild the scenario. just go straight to compile

[D3s7]

the dummy slip sounds like the fastest thing to do. scenarist has the import multiple item option (New->MultiFileData while in the Data Editor) which will let you import the blank clip and movie as one assett. it makes a pointer file with extension .cfx . I would import this as a seperate assett. then select your origional data file for the main movie in the data editor. Then in the Property Browser area select File[...]. and browse to the .cfx file and select it. then right click the same thumbnail and select data->place holder and then rightclick again and select place holder->data. and that should do it. that way you dont have to rebuild the scenario. just go straight to compile [/B][/QUOTE]


Wonder if this would work w/ different lenght angle assets too tomake them the same length

[Trahald]

Originally posted by D3s7
Wonder if this would work w/ different lenght angle assets too tomake them the same length

because the frame types have to be the same and because of the gop restrictions with angles, im thinking it wont.