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Audio anomoly
I have an odd audio anomaly that I have experienced through the past several versions of SVP (currently working in v10). As an example, I can lay a sound tone on the audio track and it will register correctly at -20.0 db. But, over time, when I add to and/or reopen a project, my tone will read out (and render out) at -20.1 db in the Master (it will still read out correctly in its own audio track, however). This is with no known added audio effects. I can copy and paste that very same audio tone into a new project and it will again register correctly at -20.0 db in both the track and the Master.
I am stumped as to what is causing this. The short answer is probably me causing it, but if so, I am unknowingly repeating the problem. Is anyone else experiencing this phantom -0.1 db audio shift in the Master output?
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8 Replies
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Ive never really taken notice of something like that.
Steve Rhoden
(Cow Leader)
Film Editor & Compositor.
Filmex Creative Media.
https://www.facebook.com/FilmexCreativeMedia
1-876-832-4956 -
You’re probably seeing floating point number conversion for display. But since it takes a 3dB change before the human ear can hear a difference, I doubt that a 0.1 dB change would ever be noticed by anyone.
Steve Mann
MannMade Digital Video
http://www.mmdv.com -
So, do you suppose that a tone of -20.1 db would be acceptable for a broadcast leader of colorbars/tone -20 db? I have been driving myself batty trying to get rid of this extra -0.1 db in some of my finished projects.
If I copy my entire project into a new SVP window, then the -0.1 db audio anomaly goes away. The down side of the workaround is that I have to reset all of my Track Motions, as they do not copy over.
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I’ve sent plenty of projects from Vegas Pro 10.0 to broadcast and I’ve never encountered this problem. What are your audio properties set to? The should be a sample rate of 48,000 and a bit depth of 16. What are you using for your -20dB test tone? It should be a WAV file. Finally, when you render your bars and tone and drop them back into a new Vegas project what do the meters read? (it might actually be rendering ok and just be a metering thing)
~jr
http://www.johnrofrano.com
http://www.vasst.com -
Yes, 48,000 and 16 bit rate WAV file. When I drop the project into a new Vegas, the file again meters correctly at -20 db and the Master meters it correctly at -20 db. So, all is well when I plop it all in a new Vegas. Which seems to suggest that the problem lies not in the individual files, but in the overall project settings. Yet, I don’t have any overall track settings, other than my Motion Track settings.
And I don’t start out with this problem. It occurs somewhere as I am building a project and it shows itself in the meter of the Master as -20.1 db (the actual tone track meters -20 db). Unfortunately, the anomaly carries over into the rendered file.
I must be doing something to make this occur, but don’t have a clue what it is.
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Wow I really don’t know what it could be. Are you using the latest version of Vegas Pro 10.0? I believe 10.0e build 738 is the latest.
~jr
http://www.johnrofrano.com
http://www.vasst.com -
Found it! In the Mixing Console for the Master audio, it was in the “Fader.” Somehow this got set to -0.1 db. It may be that I copied this same project template for the sequel projects, thus carrying over the same Fader setting. I have never purposely gone to that setting, so I did not think to look in there. But, I must have once gone in there accidentally.
I will put this down as pilot error (on my ever-growing pilot error list). Thank you.
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Hey glad you found it. That’s all that counts. 😉
~jr
http://www.johnrofrano.com
http://www.vasst.com
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