The audio is out of the sync

saroga · Post by **saroga** » Mon May 22, 2006 8:39 pm

Hi,

The audio is out of the sync in the avi file that I have captured, now I want adjust it before convert it to mpg.

The question is, will be there quality lose in the final mpg file when I adjust the audio of the avi in mediastudio pro before saving to mpg?

Or better capture it again and adjust the program to sync it life?

heinz-oz · Post by **heinz-oz** » Mon May 22, 2006 9:47 pm

What sort of AVI file are we talking about? Where did you get it from? Never heard of a DV-AVI being out of sync.

saroga · Post by **saroga** » Mon May 22, 2006 11:24 pm

Hi,

It’s an analog capturing from vhs tape PAL format, I have captured this with Virtual VCR.

I also have this log file of the program:

Frames Dropped1: 0
Frames Dropped2: 80

DVDDoug · Post by **DVDDoug** » Mon May 22, 2006 11:56 pm

An AVI file is a container file that can contain video in any compression-format. (It can contain DV. MPEG-1, MPEG-2, DivX, etc.) AVI/DV is generally the best option. If your file is 13 GB per hour of video, that's DV.

Or better capture it again and adjust the program to sync it life?

Yes.
- Try using the capture software that came with your capture hardware.
- Capture to DV if your hardware will allow it.

will be there quality lose in the final mpg file when I adjust the audio of the avi in mediastudio pro before saving to mpg?

Yes, but not because you adjust the audio. MPEG is a lossy format. Use a high bitrate for the best quality. A bitrate of 6000kbps seems typical for commercial DVDs. The trick is to encode to MPEG only once. (You can demultiplex and re-multiplex the audio/video without re-coding the MPEG video.)

If the sync error is constant throught the program (which I doubt), you could export the audio to a WAV file, and either add silence to the beginning of the audio, or add blank frames to the beginning of the video, and then re-combine them (muting the original soundtrack). This would take some trial-and-error.

heinz-oz · Post by **heinz-oz** » Mon May 22, 2006 11:57 pm

AVI does not signify a certain file type, it's a wrapper or container for compressed video files. Why did you capture to an AVI format? What are the capture settings?

You would be much better off capturing to mpeg2 if your device cannot capture to proper DV-AVI.

troppo · Post by **troppo** » Tue May 23, 2006 12:18 am

I have had this problem when capturing as MPEG2, but never as DV-AVI. Because the video started out in sync but after 60 minutes was lagging behind, I just speeded up the video very slightly to fix it.

saroga · Post by **saroga** » Tue May 23, 2006 12:53 am

heinz-oz wrote:AVI does not signify a certain file type, it's a wrapper or container for compressed video files. Why did you capture to an AVI format? What are the capture settings?

You would be much better off capturing to mpeg2 if your device cannot capture to proper DV-AVI.

I capture to an AVI format because people tell me it’s better to capture to avi and then encode to mpg2 for using in DVD.

This is the settings of the AVI.

Video: used PICmjpeg codec on highest quality
Audio: 4800 16 bit pcm audio

heinz-oz · Post by **heinz-oz** » Tue May 23, 2006 2:55 am

You got that wrong, people are advising to capture to DV-AVI. Your capture device does not use the DV encoder but some form of mjpeg, that's not the same as you realised.

Can you capture to DV-AVI, preferably type 1?

saroga · Post by **saroga** » Tue May 23, 2006 11:28 pm

heinz-oz wrote:You got that wrong, people are advising to capture to DV-AVI. Your capture device does not use the DV encoder but some form of mjpeg, that's not the same as you realised.

Can you capture to DV-AVI, preferably type 1?

I think I can't, because I work via composite, it’s an analog VHS tape (VCR). Te VHS have no firewire to use DV, when I select DV in the program, it says, no device found.

But if AVI is not the best format to capture analog video and I can’t use DV, what is then the best method to get high quality as possible?

I think not to capture direct to mpeg2 or I wrong?

sjj1805 · Post by **sjj1805** » Wed May 24, 2006 12:17 am

Although I have given it the heading VideoStudio much of what is contained in here applies equally to MediaStudio:
http://phpbb.ulead.com.tw/EN/viewtopic.php?t=13421

troppo · Post by **troppo** » Wed May 24, 2006 8:19 am

just capture straight to mpeg2. Or to another type of AVI.
MJPEG is the crappiest video format ever.

saroga · Post by **saroga** » Wed May 24, 2006 9:03 am

sjj1805 wrote:Although I have given it the heading VideoStudio much of what is contained in here applies equally to MediaStudio:
http://phpbb.ulead.com.tw/EN/viewtopic.php?t=13421

Thanks, this is a good guide, but I don't have DV-cam with firewire.

Devil · Post by **Devil** » Wed May 24, 2006 9:43 am

troppo wrote:just capture straight to mpeg2. Or to another type of AVI.
MJPEG is the crappiest video format ever.

Which MJPEG are you referring to and with which settings? There is good and bad and the good is really good. Unlike MPEG-2, it can be edited with little loss on re-rendering. I used MJPEG for years before I got my DVCAM drive: I used 4 different codecs, hardware and software. The hardware one was stupendous and I could capture analogue out from a prosumer DV cam with it and I can assure you it was even better than DV (fewer artefacts). Of the software ones PICvideo was the best, Morgan the worst and MainConcept between them.

saroga · Post by **saroga** » Wed May 24, 2006 1:07 pm

I used PICvideo MJPEG to capture analogue video this are the settings of the codec:

Compression: Quality:20
Luminance Quality:0
Chrominance Qulaity:0

Subsampling: 4/2/2

2 Fields if more than 240 lines

Codec Enabled

And it’s voor PAL country.