MP2 File - A/V Sync problems when converting to DVD

I captured 1.5 hours of Cspan yesterday, and tried to burn a DVD from
it. The audio and Video was in perfect sync while in the MP2 format
(it was captured on an ATI AIW video card as MPEG2, 720 x 480 and
44100 Hz Stereo). However when I try to burn the DVD, the audio and
video get further out of sync the closer you get to the end.

I first tried DVD Movie Factory, audio remains in sync until the burn,
then it goes way out at the end.

I next tried importing it into Video Editor of Movie Studio 7, and
while the MP2 file is in the source window, it remains in perfect
sync. However once its on the timeline, it's out of sync.

I tried importing .mp2 file into TMPEGenc and got "can not open file
or unsupported".

I tried importing the .mp2 file into PROCODER 1.01 and it would not
import,
saying that the file format was not supported or the file is damaged.

I next imported it into Virtual Dub MPEG, same problem, audio and
video go out of sync.

If I use any type of file player to play the original .mp2 file, it's
in perfect sync.

Apparently when converting to a standard DVD MPEG the sync gets out of
whack.

One thing I did notice is that while looking at source File
Properties in Video Editor 7, it says:

Video format: 24 bits (720 x 480), 4:3
Compression: NTSC, DVD, 6000 Kbps
Comp Ratio: 0%
Frame Rate: 29.97 Frames/Sec

Audio Format: MPEG Audio Layer 2 Files
Attributes: 44100 Hz, 16 Bit Stereo



Is thee any way I can salvage this thing to burn to DVD?

 

Your audio is not DVD standard it needs to be converted to
48000 Hz. Your authoring program may be able to do this,
like TMPGEnc DVD Author does. Other wise you could
use an audio program like BeSweet to convert the sample
rate.

There is something non-standard about Movie Factory's
input requirements. In VideoReDo there is a special setting
to output Movie Factory compliant .mpg.

There is sure to be a way to get the software you have
working with your video, but I can only describe what works
for me. First I would try downloading the 30 day trial of
VideoReDo www.VideoReDo.com and running your files
through that, just use the Quick-fix tool if you don't need to
do any frame accurate editing. You could have it output
Movie Factory compatible files and find whatever setting
Movie Factory has to convert the audio.

Or you could download the 30day trial of TMPGEnc
DVD Author (TDA) from www.tmpg-inc.com if you
are in the USA or www.pegasys-inc.com if elsewhere.
TDA will do the audio conversion automatically. (to
AC-3 if you have the plug-in, and tell it to)

Luck;
Ken

 

Ken;

Thanks for the help, will try to convert audio to 48000 hz and the
other things you suggested.

Jim

 

Ken;

I tried all kinds of things with little success, then tried re-muxing
the .mp2 stream into .mpg. That did it, for some reason the audio and
video came back into perfect sync.

I suspect that when the ATI AIW video capture card makes the capture
into MPEG-2, it's not a standard program stream it outputs, rather
this .mp2 stream. Although if you play this stream with any player
the audio and video appears in sync, when you go to burn the .mp2
stream the a/v is quite a bit out of sync. Somehow, remuxing the .mp2
stream into .mpg program stream restores the sync.

You were right, the ATI All In Wonder capture card allows MPEG-2
capture at 720 x 480 as a custom preset, but they have no provision
for standard 48000 audio, the highest sampling rate they offer is the
44100, which as you pointed out is non-standard for DVD audio.

Thanks for putting me on the right track.

Jim

 

Part of what VideoReDo does is to re-mux the .mpg and rewrite
the Sequence & GOP Headers as well as the PTS data to lock the
audio to the video frame.

Luck;
Ken

 

Jim, your post really confuses me. Capturing analog (cable TV) video
is ALL I do and I do it with an ATI All-In-Wonder 9600XT video card.
Even in the days when I used my first ATI AIW (8500 DV) I was able to
EASILY configure the card to capture MPEG-2 video with 48000 hz audio.
I guess what I'm suggesting is, while I didn't see you indicate what
ATI card your're using - or what version of MMC, I'm pretty sure it IS
configurable to capture 720 X 480 MPEG-2 with 48000 hz audio.

As Ken suggested, I use VideoReDo and wouldn't be without it. But I
use VideoReDo to trim and cut commercials and rarely have to use the
"Quick Stream Fix" feature on video I've captured from my ATI card.

Can I ask what ATI card you have and what version of MMC you currently
use? You shouldn't have all these difficulties.

f