[Resolved] Audio Desync During Playback and Rendering

FantasticHaz wrote on 7/18/2019, 7:53 PM

[RESOLVED] I'm an idiot. It's to do with the filters I have on the audio. I'm using a very very slight Pitch Shift, but had not checked "Preserve Duration", meaning the audio was getting further and further behind as it went. Thank you to everyone for your help.

Hello,

This is one of those problems that I can't seem to find anyone else having. I'm probably just searching for the wrong thing though.

The problem is that the playback becomes more and more desynchronised with the actual waveform. The playback "needle" will be over a section of dead air but will still be playing audio from the last section where there was noise. I know this doesn't make sense, but there's a video of the problem happening below. Listen for the difference between when a large section is played before a split versus when a short section is played before a split.

Again, I want to emphasise from the title, I can live with this happening during playback in Vegas, but the problem exists in the rendered product, making it unlistenable.

I've not sure what the origin of this problem could be. As you see in the video there's no video at all that Vegas can take project settings from: it's just audio.

If there's any details you need me to provide then let me know. Some basic info is below.

  • Version: Vegas 14.0
  • OS: Windows 10
  • Project Properties: (See Below)
  • Originally Audio Bit Rate: 140kbps

 

This forum ironically enough won't let me upload a video so here's a YouTube link:

Comments

EricLNZ wrote on 7/18/2019, 9:53 PM

What file type is your source audio? If it's mp3 convert it to wav.

FantasticHaz wrote on 7/18/2019, 10:03 PM

What file type is your source audio? If it's mp3 convert it to wav.

It is in fact .mp3, so I'll look into converting them over. Can I ask why? What's the difference, and specifically what causes this problem?

EricLNZ wrote on 7/18/2019, 11:30 PM

There was a thread a few days ago about mp3 problems. It is my understanding from folk, far more experienced and knowledgeable than me, that the nature of the compression used by mp3 makes them unsuitable for accurate editing.

Years ago with another editor I first experienced your problem when trimming a narration file and on render the cuts weren't where they were on the timeline. Only slightly out but enough to remove the end of words.

The other thread is here https://www.vegascreativesoftware.info/us/forum/bug-found-in-mp3-rendering--116287/

adimatis wrote on 7/19/2019, 12:47 AM

Hi guys,

I use almost exclusively .mp3 files and I never had any problems with sync.

I would suggest you also try a different codec or format for rendering, as well as other settings like GPU accelerated (on or off) and also the detail of the preview window - sometimes higher resolution might make difficult for video to be displayed in time with audio...

 

FantasticHaz wrote on 7/19/2019, 9:23 AM

Hi guys,

I use almost exclusively .mp3 files and I never had any problems with sync.

I would suggest you also try a different codec or format for rendering, as well as other settings like GPU accelerated (on or off) and also the detail of the preview window - sometimes higher resolution might make difficult for video to be displayed in time with audio...

 

Awesome, I'll look into that some. Thank you.