AV synch post-production problems

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Postby klinky » Fri Dec 27, 2002 8:26 pm

Maybe it's something with your computer then ;O


hop on AIM and I can test teh file out on my computer...


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Postby RadicalEd0 » Fri Dec 27, 2002 8:27 pm

well no the audio and video are decoded separately but a messed up video decode could throw the audio off. Decoding errors can come from a bad encode or a bad decoder
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Postby y2kwizard » Fri Dec 27, 2002 9:08 pm

OK, I gots more weirdness. I just did 2 XVID encodes with the EXACT SAME parameters EXCEPT FOR ONE: the audio was compressed while being combined with the video in one, and it was not compressed in the other. The one in which the audio was not compressed worked. WHy on EARTH is this?

anyway, thanks a LOT for you guys' help. It means a lot to me. This is just odd. I KNOW it's something I'm doing...probably a very, very basic step I'm leaving out. I just wonder what it is.
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Postby klinky » Fri Dec 27, 2002 9:12 pm

What are you compressing the audio to ?

Are you using the LAME MP3 ACM codec ?


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Postby y2kwizard » Fri Dec 27, 2002 9:38 pm

yeah, I'm using LAME
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"Is it a DARTH visor?" and "It's funny cuz it's pants" -- The Master of on-the-spot Funniness
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Postby y2kwizard » Fri Dec 27, 2002 9:56 pm

and I'm thinking that maybe I'm just entering the incorrect setting for my audio. I"m going to try to see if I can find the right one.
"When I got fat, I decided to grow a beard" -- The Great Andy
"Is it a DARTH visor?" and "It's funny cuz it's pants" -- The Master of on-the-spot Funniness
"You're too young for your age" and "I'm sorry for apologizing so much" -- The Master of on-the-spot Randomness
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Postby klinky » Fri Dec 27, 2002 10:08 pm

Well :O

So long as you don't change anything other then the compression settings you should be fine...

I trust you're exporting @ 44.1Khz 16bit stereo from Premiere?

Also encoding @ 44.1Khz Stereo 128Kbits or greater bitrate ?


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Postby y2kwizard » Fri Dec 27, 2002 10:35 pm

I was exporting @ 48 Khz from Premiere...but that shouldn't create any problems, should it?
"When I got fat, I decided to grow a beard" -- The Great Andy
"Is it a DARTH visor?" and "It's funny cuz it's pants" -- The Master of on-the-spot Funniness
"You're too young for your age" and "I'm sorry for apologizing so much" -- The Master of on-the-spot Randomness
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Postby klinky » Fri Dec 27, 2002 10:40 pm

Well what's your source audio in ?


If it's off a DVD then most likely 48Khz is fine...

CDs are usaully(I think always, the spec for CD audio is 44.1Khz... I swear!! I think :oops: ) 44.1Khz :\ So if you're using a CD rip or mp3, then you don't want to be exporting @ 48khz..


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Postby y2kwizard » Fri Dec 27, 2002 10:44 pm

Well, here's the problem: I have two types of audio source. The first is a song that I downloaded, and it's 44.1 KHZ. HOWEVER, I also used audio from my camcorder, which records at 48 KHZ. I exported from Premiere at 48 KHZ. I"m now trying 44.1 KHZ to see if that'll work.
"When I got fat, I decided to grow a beard" -- The Great Andy
"Is it a DARTH visor?" and "It's funny cuz it's pants" -- The Master of on-the-spot Funniness
"You're too young for your age" and "I'm sorry for apologizing so much" -- The Master of on-the-spot Randomness
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Postby Ashton » Sat Dec 28, 2002 6:21 am

Could this have anything to do with the Lame ABR versus CBR settings you think?
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Postby y2kwizard » Sat Dec 28, 2002 11:09 am

hmmm...I'm not entirely sure. I'll try outputting in both CBR and ABR and see what happens.

BTW I sent the vid to my friend, and he could not play it without its becoming choppy or getting out of sync.
"When I got fat, I decided to grow a beard" -- The Great Andy
"Is it a DARTH visor?" and "It's funny cuz it's pants" -- The Master of on-the-spot Funniness
"You're too young for your age" and "I'm sorry for apologizing so much" -- The Master of on-the-spot Randomness
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Postby y2kwizard » Sat Dec 28, 2002 11:47 am

OK, I just got a GREAT encode. I still need to work on the size, but for some reason this worked.

The things I changed are as follows:

I encoded the WAV audio in LAME using CBR as opposed to ABR
I encoded the video using Full Processing Mode as opposed to Fast Recompress.

Does anyone have a CLUE as to why this happened?
"When I got fat, I decided to grow a beard" -- The Great Andy
"Is it a DARTH visor?" and "It's funny cuz it's pants" -- The Master of on-the-spot Funniness
"You're too young for your age" and "I'm sorry for apologizing so much" -- The Master of on-the-spot Randomness
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Postby klinky » Sat Dec 28, 2002 12:04 pm

I would like to know exactly what AVG bitrate does. In my mind it averages the bits per frame? packet? Something anyways. It sounds as though it would require variable packet lengths which AVI doesn't support :\ Which is why you shouldn't use VBR mp3s with AVI files.

So ^_^ Maybe that's a idea.


Also fast recompress, may not have been grabbing frames properly. It uses a different method, which is faster, but doesn't always work on everything.


That's my guess.


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Postby y2kwizard » Sat Dec 28, 2002 12:21 pm

Ahhh, I see. Thanks a lot, Klinky, you've been a big help through all of this. I'm doing a 2-pass encode right now, and I"m using what we've learned so far. I think it'll work, but I'm not positive.

Thanks again, everyone!
"When I got fat, I decided to grow a beard" -- The Great Andy
"Is it a DARTH visor?" and "It's funny cuz it's pants" -- The Master of on-the-spot Funniness
"You're too young for your age" and "I'm sorry for apologizing so much" -- The Master of on-the-spot Randomness
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