FORUMS: list search recent posts

MPEG4 - audio sync issues

COW Forums : Compression Techniques

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
Darren Edwards
MPEG4 - audio sync issues
on Aug 17, 2012 at 7:55:58 pm

Dear all,

Our current project involves encoding an MPEG4 version for the client's website. The full res versions are NTSCs and PALs, and are edited in Premiere Pro CS3/Win XP.

Converting them using Handbrake or AVS (licensed) results in a rather anomalous issue...

They test perfectly in VLC but sync is out in every other player (QT, Real, et al) included their web player.

Presumably Mac users don't have this problem with MPEG4 and Final Cut/Compressor?

Thanks,
Darren.

http://www.youtube.com/user/darrenpce


Return to posts index

Craig Seeman
Re: MPEG4 - audio sync issues
on Aug 26, 2012 at 9:02:15 pm

It's hard to know what's happening since there's not enough specific tech details. See sticky at top of forum.

I'd note that you're using very old software. In some cases many years old. Is this an issue that just started happening? Perhaps you changed settings or updated a program that's resulting in this issue. Perhaps there was a bug that was fixed in an update you don't have.

Try using an encoder such as MPEGStreamclip (which is free like Handbrake) and see what the results is.



Return to posts index

Darren Edwards
Re: MPEG4 - audio sync issues
on Aug 28, 2012 at 10:12:10 am

Thanks for the feedback, Craig.

We've had other problems with newer machines, exporting MOVs created in Premiere CS into Final Cut and the audio knocking itself out of sync.

My main interest, though, is if Compressor/Final Cut is more pro-MPEG4 encoding than the newest PC/CS?

D.

http://www.youtube.com/user/darrenpce


Return to posts index


Craig Seeman
Re: MPEG4 - audio sync issues
on Aug 28, 2012 at 3:40:48 pm

I have no idea what you mean by "pro-MPEG4"
These are all professional options and all require some understanding to troubleshoot. No software is without its issues. You need to know how to troubleshoot. You haven't provided information for any meaningful outside help.

Sync issues happen for a reason and you have to understand why, what players, what issues.



Return to posts index

Ty Thompson
Re: MPEG4 - audio sync issues
on Aug 29, 2012 at 2:49:20 am

MP4 container is too hardware tuned and operates on a lot of assumptions, particularly with sync. Save to MP4 valid codecs in an MKV then remux into an MP4, it should result in more software friendly time stamps.


Return to posts index

John Fishback
Re: MPEG4 - audio sync issues
on Nov 7, 2012 at 6:05:19 pm

This happened here, too. In our case there was a delay introduced by monitoring audio thru the Kona card, but viewing video on the MacPro. When audio pref was switched to audio line out everything was in sync.

John

MacPro 8-core 2.8GHz, 8 GB RAM, OS 10.7.4, QT10.1, Kona 3, Dual Cinema 23, ATI Radeon HD 5870, 24" TV-Logic Monitor, ATTO ExpressSAS R380 RAID Adapter, PDE enclosure with 8-drive 6TB RAID 5
FCS 3 (FCP 7.0.3, Motion 4.0.3, Comp 3.5.3, DVDSP 4.2.2, Color 1.5.3)
FCP-X 10.0.6

Pro Tools HD 10 w SYNC IO & 192 Digital I/O, Yamaha DM1000, Millennia Media HV-3C, Neumann U87, Schoeps Mk41 mics, Genelec DSP Monitors, Prima CDQ120 ISDN


Return to posts index

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
© 2017 CreativeCOW.net All Rights Reserved
[TOP]