sync problem when converting dv to dvd

[frubsen]

hi all

i am having a problem when converting a dv avi file to dvd.

i captured a vhs tape using the passthrough on my digital8 camcorder to get a dv avi file.

the avi file is perfectly in sync all the way through.

I am using CCE to encode the video file and I used Belight to encode to AC3. When I author the dvd, i play it back and near the beginning the audio is in sync, but by the end the audio is almost a second out of sync.

I have tried recapturing to a type 1 dv file, I tried mainconcept mpeg encoder to encode both audio and video and the output still has the gradual out of sync.

I have been tryign to figure this out for a few weeks now and it is really starting to bug me. Any help?

[Pookie]

I don't work with DV, but I did stumble across this thread some time ago regarding audio sampling rate issues and certain DV camcorders.

[ short explanation of problem -- some DV equip creates out of spec
unlocked audio that becomes apparent when the A/V streams are separated,
compressed, and re-mux'ed together. Problem not apparent at beginning of
the video, the A/V creeps increasingly out of sync. Worst offender seems to
be some Canon camera models from a particular time period that created
48008-48009 audio which leads to approx .3 sec A/V out of sync after about
30 minutes of video. ]]

http://www.arcknowledge.com/gmane.comp.video.ffmpeg.user/2005-06/msg00004.html

[frubsen]

so would it just be better to capture using an analog capture card?

[bb]

An analogue capture card may be a solution for you, but it is also possible, that the video quality you achieve that way is worse than with the camcorder. On top of that, the audio issue remains, if the audio signal is captured through a sound card having a separate clock, not through the capture card.

It is relatively easy to solve your problem by stretching the audio, because the delay is increasing by a constant factor. There are several free tools available to do that on a WAV file (including VirtualDub, if I am not mistaken). Then you feed the stretched audio stream into BeLight to encode to AC3.

bb

[halsboss]

Worst offender seems to
be some Canon camera models from a particular time period that created 48008-48009 audio which leads to approx .3 sec A/V out of sync after about 30 minutes of video.
http://www.arcknowledge.com/gmane.comp.video.ffmpeg.user/2005-06/msg00004.html



*****, just bought a canon MV920... any idea if the canon MV920 is an offender ?

[bb]

No profanity, please.

bb

[halsboss]

No profanity, please.

bb
The ordinary name of a 4-legged rodent larger than a mouse was profanity ? Oops, sorry.

[bb]

We are quite strict about the netiquette here. But now let's get back on topic.

bb