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audio – different levels
I render our projects with the MXF format and each project is rendered in three parts before they are sent out to be put on master tapes.
Anyway, after I render the three sections, I always put those MXF files back on the timeline just to be sure they follow from one to the next smoothly.
Now,I’ve noticed on several projects that one of the files is slightly louder than the others in the sequence but a slight amount. Looking at the wave form, it can be seen as well.
The same template was used to render them all. What could be going on?
Sometimes I render more than one section at a time by opening several instances of Vegas. Could that have an effect?
Thanks.
RogerRoger Bansemer
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6 Replies
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What are the levels like during editing? You want to make sure that the Master level is constant between projects.
Steve Mann
MannMade Digital Video
http://www.mmdv.com -
Hi Stephen,
It’s just one project at a time just split into regions and then each region is rendered with the same template.Roger Bansemer
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Are you applying a compressor to the audio track? I have noticed that compressor output differs slightly if you start at different points on the timeline. For example, if I start from the beginning and see it clip at some point, restarting at a point near the clip does not always reproduce the clip behavior.
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I am using the Sony compressor and also a wave hammer on the master bus. Not sure what you are saying exactly though in your comment. Can you explain a bit more.
Roger Bansemer
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I am saying that the compressor produces slightly different results if you start at different points on the timeline. It is almost as if it is using something like a moving average in its computations. If it has more history, it will produce one result at a particular point on the time line. If it doesn’t have the same history, it produces a different result. I see this when the compressor flags a clip (i.e. the volume is too high and is clipping) at specific points. If I go back and replay the audio to see if the clip is audible, the compressor usually will not flag a clip (the meter turns red) at the same point. Naturally, I do not go back to the beginning of the timeline to replay the point in question. Instead, I start perhaps 10 or 15 seconds before the clip point.
I don’t know if the difference is audible, but I have observed this behavior for a long time now.
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That’s very interesting and it sounds like that is exactly what has happened. On three of the nine projects I’ve completed recently the audio in one of the parts has changed. I can’t begin to render at a point before the audio begins (because the parts run one right after the other) so I’ll just render the entire project in one piece.
At least I know what’s going on now.
Thanks for the information.
It’s so hard keeping up with all that has to be considered…
RogerRoger Bansemer
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