Yet another A/V sync prob. from an experienced user.

I have been using the tools and ideas from VCDHelp for quite
some time now and I do have to say it has helped with everything
I have had a problem with, up to now.

Here's the deal:

Dark City: avi format. Two spots in the movie where video freezes
but the audio keeps going. No problem with the sync here.
Editing:VDub to scan for bad frames. It catches them and fixes them.
No sync problem here.

Conversion:Use TMPGEnc to convert to NTSC Film (due to the fps) and
up to about 1 hour the movie is fine with the sync. After that
it gets about "A hair or 2" out of sync. Very frustrating.

I have extracted the audio to a wave file, "Time Warped" it with Goldwave
to the EXACT time for the video. Encoded the wave and video and I STILL
have the a/v sync problem.

I would like to hear some ideas on this problem.

Thanks in advance.

[bugster]

When you use vdub to scan for bad frames, it 'fixes' them by removing them from the stream. It doesnt' remove the equivalent amount of audio though, so this could be where your sync problems come from.

[KingJohn]

I don't agree with this at all, if you take out 10 minuets of video from an 80 min movie, are you saying you have a 70 min video with 80 min audio ?

If you cut out bad frames, it will also remove that section of audio. Vdub is used all the time to remove bad frames, with out any problems at all ! Why say it never works ?

Saving using steaming for both audio and video in the new Vdub, will remove both audio and video at the bad frames.

Dark City: avi format. Two spots in the movie where video freezes
but the audio keeps going. No problem with the sync here.
Editing:VDub to scan for bad frames. It catches them and fixes them.
No sync problem here.

Megadeus324, you don't say whether Vdub gives you a warning about Variable bit rate ?.

Have you tried to encode with TMPGEnc without any changes, TMPGEnc will handle some bad frames anyway, you could use the source range set at just before the start of the bad frames, then if its going to error, you will know about it sooner.

A better method is to use Vdub MP3, which make a log of the bad frames at c:\badframes.log using that log you can delete the frames at keyframes, starting with the highest group numbers first. (See my other posts, for more detailed info)

Vdub MP3 can be downloaded from
http://www.digital-digest.com/dvd/downloads/virtualdub.html

This lets you see what is going on !

UPDATE:

I have had some success with the a/v staying in sync. I was farting
around with TMPGEnc and the various settings last night and decided to
check off, on the "Advanced" tab the 3:2 pull down AND check off
the "Deinterlace" boxes. I also encoded it as a 23.976fps as this was
the original avi fps.

The only reason why I was messing with the 3:2 and the Deinterlace was
because of this thread:

http://www.vcdhelp.com/tmpgencexplained.htm

I thought that "Yeah, I'm wanting to encode a 23.976fps to a 29.97 fps
so I can make a VCD.

Well, then end product was............ Ta Da, An in sync mpg!

Now, only one small problem. Due to one of the settings I now have a
rather prominent TV scan line effect. That is, whenever someone moves
or the scene changes I can see some scan lines. It is NOT as bad as the
a/v sync problem. I can live with it, BUT, if there is some way to get
rid of these AND change it to a 29.97fps mpg that would be great.

NUTSHELL: MPG is in sync BUT with scan lines AND 23.976fps.

NEED: No scan lines AND 29.97fps.

Thanks for you input. I'll await your wisdom!

I may have my "No Scan Lines AND 29.97fps".

Again, I am farting around with TMPGEnc and the P4. I have messed
with the deinterlace option under the Advanced tab and tried to get the
best possible output. I just have to check the whole clip when it
is done encoding. If the second clip stays in sync then I am going to
be one happy camper. If not, I'll just be out about $17 for the DVD.

Thanks again and I'll post my results soon!

[KingJohn]

Glad your having fun and getting there slowly, what are "Scan lines" ? people in here give all sorts of descriptions to things, and its hard to know what they mean sometimes

I don't know if its my DVD player, or TV, but I convert everything to PAL at 25fps no matter what it is !!, and apart from the occasional fast pan across the screen looking jumpy, the rest is 100% I just use the standard template, NTSC Film, NTSC VCD, DVD what ever it gets converted to PAL VCD without anything special in TMPGEnc.

[quote="KingJohn"]Glad your having fun and getting there slowly, what are "Scan lines" ? people in here give all sorts of descriptions to things, and its hard to know what they mean sometimes

Scan Lines, as I call them, are the lines that show up whenever there
is some action on the screen. As I have found out this is the "Interlace".
So, my interlacing was off.

BTW: I finally got my movie to work out.

I had 3 bad spots in it. The first 2 were no problem but the 3rd one
took the cake.

Whenever I would run VDub to look for "Bad Frames" it would pick
up on the 3 frames that were bad. No Problem. I would then save
the wave and combine them in TMPGEnc but my a/v sync was off
right around the 3rd bad frame.

To make a long story short: To get the movie in sync I had to:

Scan for bad frames. Save the avi. (#2)
Using #2 I had to delete the section of movie starting at the
3rd bad frame. Save this as movie part 1.

Using #2, GOTO the 3rd bad frame, move ahead 1 key frame, then
delete the first part of the movie, saving this portion as movie part 2.

After this was all done I then encoded both parts (separately) and
my movie was all in sync.

BTW: The spot in the movie where the 3 bad frame was WAS right
in the middle of it. So I had 2 parts of equal size, perfect for my VCD.

Another BTW: I had a small problem with my Apex 1100W. Right out
of the box it was making a kinda loud sound whenever I would play
a DVD or VCD. It eventually got to the point where it would not play
anything. I looked at nerd-out.com and got some ideas. I opened
the case and found that the counter-weight had become stuck. It was
in such a position that whenever a disc was loaded it would not spin
correctly. I just moved the weight back and my god, the player was
soooooo quiet.
Since I have fixed this problem I MAY try a kwag template for a movie
to see if my player will handle it. I think the main reason why they
would not play before was due to the disc not spinning correctly.

More Later.

[KingJohn]

Ok...

Scan for bad frames... If it finds any

Video > direct stream copy
Audio > direct stream copy
SAVE AVI

That saves out another copy for use later...

If you save out the audio, then remove bad frames, you will have sync problems.

A better program for scanning is "vdub-mp3-freeze.exe" this version makes a log of the frames at c:\badframes.log which can be used to manually delete the frames (At keyframes) starting with the highest group first

http://www.digital-digest.com/dvd/downloads/virtualdub.html

Just for reference

However the main thing is you got it all working, until the next download which will probably be different

[moon]

I have movie is RM format,and had sync prob, what to do,
some one help?
thx