Audio MIsaligned when Rendered to MP4. HUH??? Help

i c e wrote on 2/5/2010, 3:50 PM

Hello all,
How has everyone been? Probably don't remember me but I practically lived on here about a year ago when I was working on some films. I learned so much.... everyone's help has taught me practically everything i know.
Hope all is well.

Anyways I found a problem that absolutely confounds me:
Every time I render a project to the MP4 Format for the web it somehow delays the audio. I have to go back into the project select all the audio frames and move them by hand, guessing, to offset this error. I know that before the orginall error everything was lined up and played well.

Any one have any idea what to do to fix this? Really confused here and would greatly appreciate the help.

Thanks a million,

Joshua

Comments

John_Cline wrote on 2/5/2010, 3:56 PM

How are you playing the MP4 videos back? I would suspect the playback software before I would blame Vegas encoding. QuickTime has been known to have audio sync issues.

BudWzr wrote on 2/5/2010, 3:57 PM

Maybe you're not really lined up. Did you "snap" align?

i c e wrote on 2/5/2010, 4:03 PM

Wow. thanks for getting back so quick. I remember why I love this place.

Yes, I am using quicktime. Also.. uploaded to YouTube and the audio is off. I forgot about this lil problem and uploaded the thing and am now trying to correct it.

Yes. Positive that everything was perfectly snapped to place and played perfect before the render. AVI and MPEG2 For Architect doesn't do this.

Thanks again,

Joshua

Yoyodyne wrote on 2/5/2010, 4:11 PM

I've been having this issue as well in quicktime. Audio sync is great in VLC player, sync is off in quicktime. It's not crazy bad but noticeable. I'm thinking it's a quicktime on windows problem.

i c e wrote on 2/5/2010, 4:20 PM

Yeah, makes sense. But what about the upload to YouTube? Maybe I could beg the favor of someone watching the video. Maybe i have just lost my mind and the words aren't really off.

http://www.youtube.com/user/JoshuaWoroniecki#p/a/u/1/-3VmaCbO6QI

thanks people.

Josh

Yoyodyne wrote on 2/5/2010, 4:34 PM

Watched some of the video. Sync looks slightly delayed but not too bad. I always upload with wmv files and everything has worked out pretty good.

i c e wrote on 2/5/2010, 4:39 PM

Thanks a million Yoyodyne.
Really? What is the quality of .wmv like? Any tips on how I should put all the settings? I finally got .mp4 to look pretty good. Would really appreciate the help.

Fact is, i am trying to do parts two and three right now. Everything is ready just don't know how to render'em.

Joshua

Yoyodyne wrote on 2/5/2010, 4:45 PM

try this as a test. Just like 5 seconds or so:

wmv at 6Mbps at project size. Should look pretty good. I believe that Youtube and Vimeo convert everything to 720 - 24p FYI. Can anybody confirm that?

Hope this helps.

i c e wrote on 2/5/2010, 4:49 PM

Thanks a lot man. I think I am going to leave that one as it is. Maybe I am just nitpicking. It's just that in Quicktime it's major. like one of those old movies. Glad Youtube is better.

I will mess with the rest of the settings for the next ones.

Thanks again.

peace out.

Josh

John_Cline wrote on 2/5/2010, 8:41 PM

The audio sync on part 1 seems pretty good, the audio on part 2 seems to be leading the video by a fair bit. People generally don't notice when the audio lags the video because our brains are used to that since light travels faster than sound. It is very unnatural when you hear the audio occur before the video.

VanLazarus wrote on 2/6/2010, 12:56 AM

I've noticed a slight sync issue with my MP4s in WMP as well. I don't think this is a Vegas problem, but rather a playback problem as other people have mentioned in this thread.