Synch problems in Full lenght Videos using VDub not on....

[hlof]

Hi

I recorded VHS Home Videos on a VHS CamCorder and I want to Capture them to my PC. They're recorded on SP Mode.
When I play them back after Capture, the sound comes first and 2-3 Seconds later comes the Video(If they talk, you hear first what they say and then you see the lips moving).

I Captured a few Original 60min. Videos without Synch Problems.

I use DivX Fast Motion Codec and I don't change any other settings.

Does anybody know, what can I do to correct this?

Thanks in advance!!!

[FiEND]

dont capture to divx if that is what you are doing. capture to a codec like huffyuv or mjpeg, depending on how much room you have on your hard drive to capture.

make sure your audio is set at PCM CD Quality for recording (which is 44Khz 16bit Stereo)

make sure your framerate is 29.971

resolution is up to you, depending on how big you want it. 352*240 or 352*288 for PAL is the best way to start and test things.

then when you are done, you can encode it to divx/mp3 low motion, not fast motion and then add filters if you need them to fix (smooth) noise etc. this is with virtualdub.

if you have audio out of sync, there are 2 things you can do, depending on how it is out of sync.

if it is gradual out of sync, starts out good but gets bad over time, you can use virtualdub VIDEO/FRAME RATE/change so video and audio durations match. this usually does the trick.

if it starts bad, like you say it does... you can use virtualdub to delay or advance the audio a bit in the AUDIO/INTERLEAVING/Audio Skew Correction... try 300 and see if it helps and work your way up. I have had some that need 3000 to fix. -300 if its the other way and audio is after the people speak.

this is the best way, just not the quickest nor easiest.

[hlof]

Thanks FiEND for taking the time to reply,

I'll try the tips you gave me...

So Huffyuv 2.11 is a better codec for better quality than DivX?

Also, I have 60GB on my H.D. and most of it is free space...

[FiEND]

huffyuv is a lossless codec. it is also superfast. it is not meant for viewing though, an hour of 352*240 is about 7GB.

it is meant to be captured and edited very easily and fast without losing quality. once you have it captured, then you convert to divx/mp3 with editing and quality improvement filters applied if you want or need them.

[hlof]

Thanks a lot, FiEND!!!!

I Captured as you said (I used 450 at Audio Skew Correction) and it worked!!

Thanks again

Now I can start working with the other VHS Videos that I wanted to Capture....

If you Need anything just say so...


PS I borrowed the VCR that's why I was in a hurry.
I have DVD player, I sold my VCR....

[hlof]

It seems I have to use different a number at Audio Skew Correction for different Video Captures.

I Captured a 2 hour VHS Home Video and I used 450 A.S.C.

On another 1 hour VHS Home Video I had to try between 600 and 650...

Why is that?

[FiEND]

yea that is normal, it changes every time for me as well. i cant really say what does it though.. prob just some thing to do with the signal from the vhs tape to the computer getting out of whack somehow.. intereference or whatever.

[hlof]

Anyway, you did help me a lot and I appreciate it.

I've Captured about 5 VHS Tapes so far.

Thanks again....

[hlof]

FiEND,

I tried to capture as you recommended:

Using huffyuv Codec, Audio set at PCM CD Quality (44Khz 16bit Stereo), Framerate 29.97, Resolution at 352x240....

but it doesn't Capture bigger than 4GB. It stops saying AVI output file something...

Why is that?

How can I correct this?

Thanks

[hlof]

Then, when I tried to open the file, it starts the AVI Import Filter Reconstructing Missing Index Block (Agressive Mode)....

[FiEND]

if you have a 4GB limit, that usually means your hard drive is formatted to FAT32.

in this case, you would have to have the file split into segments.

if you dont split it then it will go until the file cant write anymore, and since the file index and information is at the end of a .avi file, it wont be able to write the information and you will have to try and fix the file.

virtuladub, avi_io and iuvcr have the ability to split files into multiple parts when capturing. this is what you should use. then you can append the parts in virtualdub to make it 1 big file when encoding it.

the other alternative is format (convert) your capture partition to NTFS if you are using NT/2k/XP then you wouldnt have the size limit on files.

[hlof]

Thanks for always being there for me, FiEND and I'm sorry to bother you with so many questions....

My OS is Windows Millennium Edition, and my HD is 60GB (splitted in two at 50% each. 21GB free on C: and 24GB free on D:
I have my PC for Home use only. Usually for Movies and FPS Gaming wich is my past-time.

I have these questions:

1- How do I split the file into segments?
2- How can I append the parts in VDub to make it one single file?
3- How do I encode it?

Also...What is FAT32 for?

[FiEND]

1- How do I split the file into segments?

depends on what you are using to capture with. i believe avi_io does it automatically.. virtualdub and iuvcr they have to be set to do it.

although I have never done it, in virtualdub I believe there are two settings. first is on the menu CAPTURE/Enable multisegment capture. the second part is in the CAPTURE/CAPTURE DRIVES/ where you add your capture drive and set the max filesize.

actually, here is what the maker of virtualdub has to say

I'm getting an error when I try to capture an AVI file bigger than 4GB.

You'll get this problem if you either (a) are running Windows 95/98/98SE/ME, or are saving to a FAT32-formatted partition. Either limits you to 4GB. If you want to capture a single file bigger than 4GB, you must have your capture partition formatted as NTFS and you must be running Windows NT/2000. The error message itself is caused by Windows, and not by the limitations of the AVI file format.


So how do I capture more than 4GB?
You must do all of the following:

Use normal capture (F6 key) and not compatibility mode capture (F5 key).
Check Capture/Enable multisegmented capture.
Add one or more drives to Capture/Spill drives. Set the thresholds to 50MB, and make sure you use a full path (i.e. E:\ and not E. Also, set priority of all drives to 0 to avoid a bug in V1.4c.
VirtualDub will then capture in segments to a bunch of 2GB files.

2- How can I append the parts in VDub to make it one single file?

virtualdub will usually do this automatically when you open a file. if it doesnt automatically add them, check when opening a file if the 'automatically detect & load additional segments' is checked. also you just have to click the 'append' instead of load to add more segments.

3- How do I encode it?

you encode it as usual, as if it was only one single file.


Also...What is FAT32 for?

fat32 is what windows95,98,ME use to format the hard drives. it is a 32bit but is still basically the same as FAT except it can handle larger sized hard drives and partitions. it can only handle separate file sizes of 4GB though.


one concern though. you will have to test this and see how it performs for you. you might drop frames between file switching, depends on your CPU power im sure. if you do, you might be able to add video and audio buffers to virtualdub to give the hard drive more time to make the files before windows tries to write to them. test it first though and see.

[hlof]

OK, I'll give it a try.

Thank you very much for your time FiEND.

I'll post what comes out of it....