Audio volume cuts suddenly when rendered

mortytemps wrote on 9/3/2022, 12:59 AM

Any help would be great!

Just upgraded to Vegas 20. I'm having problems when rendering to Audio - either every 30 seconds or every minute, the volume dips down for about half a second, going down about 10dbs, and then comes back up. It is doing this for all rendering templates (WAV, Mp3, FLAC) and different bitrates. Everytime it does it in slightly different locations, but always seems to be doing it approximately on the minute/30 seconds.

Is this a bug anyone has identified? Solutions?

Michael

Comments

mortytemps wrote on 9/3/2022, 6:38 AM

After experimenting with probably 100 different solutions now, I am still at a loss.

However, strangely enough I've discovered the following:

When I've deleted any unnecessary tracks from the project, the problem isn't as pronounced - the volume only dips every 90 seconds as opposed to 30 seconds after rendering. These tracks were all muted in the initial render. In all cases there are no issues when it is playing back in the Vegas Project File, before rendering.

Dexcon wrote on 9/3/2022, 6:52 AM

Only as a suggestion (which you've probably already tried), hit keyboard 'V' to show the audio envelopes on each audio track (they are blue lines along the centre of the audio track). If there are no audio envelope changes, each audio envelope should be a straight line right along the entire audio track. However, if there are nodes which lower the envelope in height (thus lowering the volume) and followed by other audio nodes which return the volume to zero, then that may be the cause of the problem.

Cameras: Sony FDR-AX100E; GoPro Hero 8 Black

Installed: Vegas Pro 16 Edit, Vegas Pro 17 Edit, Vegas Pro 18, Vegas Pro 19 Edit, Vegas Pro 20 Edit, HitFilm Pro 2021.3, BCC 2022.5.1, Mocha Pro 2022.5.1, Ignite Pro, NBFX TotalFX 7, Sound Forge Pro 16, SpectraLayers Pro 9, iZotope RX9 Advanced

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mortytemps wrote on 9/3/2022, 6:56 AM

Thanks Dexcon for the suggestion - alas, it's got nothing to do with envelopes: The results are different on every render as to where the volume dips :(

DMT3 wrote on 9/3/2022, 7:25 AM

Are you using any audio plugins? Could be an unregistered effect.

rraud wrote on 9/3/2022, 11:12 AM

Have you tried a different video player or player on another PC. If you do not hear the abnormality in preview, it could be the player app. Video LAN (VLC) and Media Player Classic (MPC) are favored by many Vegas users.

mortytemps wrote on 9/3/2022, 4:30 PM

Have you tried a different video player or player on another PC. If you do not hear the abnormality in preview, it could be the player app. Video LAN (VLC) and Media Player Classic (MPC) are favored by many Vegas users.

I'm about to try on another PC. It's not the Player App as it also happens when importing the rendered track into Vegas. Thank you though!

mortytemps wrote on 9/3/2022, 4:32 PM

Are you using any audio plugins? Could be an unregistered effect.

Yes, I'm using quite a few audio plugins. In fact, that was the main reason that I updated to Vegas 20, due to it's support for VST 3.

I suspect this is what is causing it (a suite of Waves plugins). However it is still quite odd, since it is affecting the volume of tracks that have no plugins applied to it (and there is no plugins to the Master).

I'll try rebuilding the track and see what happens. Quite frustrating!

Thanks - will update here, and other suggestions are wonderful.

rraud wrote on 9/3/2022, 5:03 PM

I do not know about VP-20, but previous versions (since the audio only Vegas 2) added three plug-ins to each audio track by default (Compressor, Gate and Reverb as I recall). I do not think they are the cause of the problem here though.

mortytemps wrote on 9/3/2022, 5:21 PM

I think I've identified the problem - it looks like it is the SPAN Plug In for EQ monitoring: https://plugins.landr.com/en/product/voxengo-span

When I bypass it, it currently *seems* to be fine. I'm not sure if this is a VST3 issue with the new version of Vegas. I was able to use SPAN fine in Vegas 18 without any issues.

I also did have some very weird results when initially adding Waves EQ Plugins to a particular track. The volume for the track would automatically be adjusted by 10db+. This was permanent (even when deleting the plugin from that track), until I moved the event to a different Track and started again.

This may be of use to someone if they encounter the same problems. There seems to be some bugs in Vegas 20 in how it runs plugins that didn't seem to occur on previous versions. I'll look at filing a report.

Thanks to everyone for the suggestions.