I have a 2 hour compliant MPG2 file that I'm just trying to add chapter points and menus. When I generate the DVD files on disk and then use a DVD viewer I notice that the generated DVD has audio/video sync issues that get worse as the video progresses. The original MPG2 file has no sync issues so I can only conclude that DMF4 has regenerated the information. The original file is MPG2 with a MPG1 layer 2 audio track.
Why does DMF4 rerender the file and is there a way to stop it from doing this? Or, is there a way to make sure the audio and video stay in sync? I'm using motion menus, are they a factor?
How to stop DMF4 from rerendering a compliant MPG
Don not convert...
hit the little gear icon, and check the box that says "Do not convert compliant mpeg files"
Is your source audio 48khz, or 44.1/other? If not 48khz, DMF4 will need to resample it to 48khz, and that could throw off your sync.
Also, make sure you DO NOT have a check box in the box that says "Treat mpeg audio as non-DVD compliant" (this will then use your mpeg audio as long as it is 48khz (for a DVD). NOTE: mpeg audio is not a standard for NTSC DVD's (so some NTSC DVD Players will not be able to play it properly).
Is your source audio 48khz, or 44.1/other? If not 48khz, DMF4 will need to resample it to 48khz, and that could throw off your sync.
Also, make sure you DO NOT have a check box in the box that says "Treat mpeg audio as non-DVD compliant" (this will then use your mpeg audio as long as it is 48khz (for a DVD). NOTE: mpeg audio is not a standard for NTSC DVD's (so some NTSC DVD Players will not be able to play it properly).
George
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jwatkins
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jwatkins
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maddrummer3301
- Posts: 2507
- Joined: Fri Dec 10, 2004 10:24 pm
- Location: US
Hi,
A video file can play in sync while viewing on the computer but after
put into a vob container (dvd session) can play out of sync.
Software players on the computer don't playback a video the same as
a dvd player does. Although you think the file is good it may
have problems in the time-stamping etc.
You can download a trial version of "VideoRedo" to test the file for
audio errors (fully functional for 30 days). The program will also
correct the audio most of the time.
How was the original file created/edited etc?
Hope this helps,
MD
A video file can play in sync while viewing on the computer but after
put into a vob container (dvd session) can play out of sync.
Software players on the computer don't playback a video the same as
a dvd player does. Although you think the file is good it may
have problems in the time-stamping etc.
You can download a trial version of "VideoRedo" to test the file for
audio errors (fully functional for 30 days). The program will also
correct the audio most of the time.
How was the original file created/edited etc?
Hope this helps,
MD
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Emery
MF4 Record DVD with LPCM for no audio sync shift
I had a similar problem: I brought all my video in as MPG2 with MPEG1 audio, using an ADS Instant DVD USB 2.0 unit. A single continuous video
file recorded to DVD with MPEG audio played fine, but when I edited
or joined two video files together and then recorded to DVD with MPEG audio, I got an audio sync shift starting at the point where the two files joined; it was a fixed shift amount, not a progressive amount.
The fix was to record to the DVD with LPCM audio instead (what the vast majority of DVD players require anyhow). No more audio sync shift; the resultant DVD played fine. MF4 handled changing the MPEG audio of the source files to LPCM during DVD recording without a hitch. I don't know
if recording DVDs with LPCM will fix everyone's audio sync problem, but
it took care of mine. The ADs unit captures ONLY in MPEG audio, not LPCM, so it must be converted to LPCM during the final DVD recording process when using MF4.
But, MF4 still should be able to handle multiple joined files and record DVD MPEG audio from MPEG audio, so it definitely has a bug or two. I've already talked to Ulead tech supt. about this.
Hope this helps.
Emery
file recorded to DVD with MPEG audio played fine, but when I edited
or joined two video files together and then recorded to DVD with MPEG audio, I got an audio sync shift starting at the point where the two files joined; it was a fixed shift amount, not a progressive amount.
The fix was to record to the DVD with LPCM audio instead (what the vast majority of DVD players require anyhow). No more audio sync shift; the resultant DVD played fine. MF4 handled changing the MPEG audio of the source files to LPCM during DVD recording without a hitch. I don't know
if recording DVDs with LPCM will fix everyone's audio sync problem, but
it took care of mine. The ADs unit captures ONLY in MPEG audio, not LPCM, so it must be converted to LPCM during the final DVD recording process when using MF4.
But, MF4 still should be able to handle multiple joined files and record DVD MPEG audio from MPEG audio, so it definitely has a bug or two. I've already talked to Ulead tech supt. about this.
Hope this helps.
Emery