AV synch post-production problems

Ashton · Post by **Ashton** » Sun Dec 22, 2002 12:08 pm

Allright, so I produced a whole MV using dummy MJPEG files and I went and replaced them with my original DVD source. Everything got screwed up for some reason (all the frames were between 1 and 20 frames faster than the fummy files were, and it was completely random how off they became) but I fixed that. I only mention it because it might have relevance to my current problem.
Anyway, I finished the vid, and output into Huffy so I could try an output from Vdub. After a long and hard battle with Vdub and AVS, I rigged my AVS file as follows:
video = AVISource("C:\amv\full.avi")
audio = AVISource("C:\amv\full.avi")
AudioDub(video, audio)
crop(8,0,-8,0)
LanczosResize(480,352)

and the sound and video look like they are probably right in Vdub. So I output using XviD on 2 passes but the outup is messed up. The start of the file is fine. It works well for about 20 seconds and then there is a slight jitter, the video freezes for a second but the audio keeps going. The video then resumes, but its completely lost A/V synch. There are more slight jitters thruought the rest of the video aswell.
I tried encoding starting from a later point, but that produced largely the same results.
Any ideas?

RadicalEd0 · Post by **RadicalEd0** » Sun Dec 22, 2002 2:24 pm

sounds like an encoder or decoder problem, first try playing back the clip in vdub and see if the same thing happens, if so then theres something wrong with the way its being decoded. Otherwise its an encoding problem and you might want to download a different build of XviD or try re encoding with different settings.

btw, when using avisource you dont need to audiodub, avisource reads the audio from the file and passes it along automagically
AVISource("C:\amv\full.avi")
will work fine

RadicalEd0 · Post by **RadicalEd0** » Sun Dec 22, 2002 2:25 pm

RadicalEd0 wrote:if so then theres something wrong with the way its being decoded.

should be if not then theres something wrong with the decoding >_<
klinkisms

JustAnOrdinaryPanda · Post by **JustAnOrdinaryPanda** » Sun Dec 22, 2002 3:22 pm

I know XviD is DivX backwards, but is XviD a codec on it's own? Or is it a 'cool' way of saying DivX?

RadicalEd0 · Post by **RadicalEd0** » Sun Dec 22, 2002 3:29 pm

hahaha

when projectmayo was formed back in the day to build a legal nonhack version of divx a bunch of projects spun off and were developed independently. 3viX, DivX 4 which led to 5, and XviD (probably some other obscure nonsuccesses too)
XviD is the only one thats still opensource and not being handled in a big omg corporation way but being developed and revised constantly. That makes it less stable than say DivX Networks which releases DivX in incremental versions (4, 5, and then updates like 5.01 and .02) but also way cooler and more versitaile (sp). XviD is currently being developed and compiled by 3 guys from Doom9, Koepi, Nic, and Umaniac. AFAIK most people use Koepi's builds.

in other words ya its a very different codec from any version of DivX despite similar roots

JustAnOrdinaryPanda · Post by **JustAnOrdinaryPanda** » Sun Dec 22, 2002 3:33 pm

RadicalEd0 wrote:hahaha

when projectmayo was formed back in the day to build a legal nonhack version of divx a bunch of projects spun off and were developed independently. 3viX, DivX 4 which led to 5, and XviD (probably some other obscure nonsuccesses too)
XviD is the only one thats still opensource and not being handled in a big omg corporation way but being developed and revised constantly. That makes it less stable than say DivX Networks which releases DivX in incremental versions (4, 5, and then updates like 5.01 and .02) but also way cooler and more versitaile (sp). XviD is currently being developed and compiled by 3 guys from Doom9, Koepi, Nic, and Umaniac. AFAIK most people use Koepi's builds.

in other words ya its a very different codec from any version of DivX despite similar roots

Ah, figures. Is it better than the most recent official DivX?

(versatile)

RadicalEd0 · Post by **RadicalEd0** » Sun Dec 22, 2002 3:35 pm

how could you even ask such a thing :O

yes :p

JustAnOrdinaryPanda · Post by **JustAnOrdinaryPanda** » Sun Dec 22, 2002 3:38 pm

RadicalEd0 wrote:how could you even ask such a thing :O

yes :p

Sorry, I don't normally use DivX or anything. Since I haven't made anything I'm willing to upload, I just use Mpeg, my laptop hates DivX, although I swear it's not just me...

RadicalEd0 · Post by **RadicalEd0** » Sun Dec 22, 2002 3:41 pm

JustAnOrdinaryPanda wrote:Since I haven't made anything I'm willing to upload

I hear ya

I only know such because I do dvd rips and things :\

Ashton · Post by **Ashton** » Sun Dec 22, 2002 8:48 pm

RadicalEd0 wrote:btw, when using avisource you dont need to audiodub, avisource reads the audio from the file and passes it along automagically
AVISource("C:\amv\full.avi")
will work fine

Crap, then Im doing something wrong because I had to figure all that dubing crap out BECAUSE it wasnt passing the audio along...