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How do you set your audio levels? I have a mixer output feeding the MediaPress board but I am unsure where the max level is.
The audio input level for the MediaPress
analog input is a standard consumer line-level signal. The best way to
adjust your system setup for the analog input is to find the maximum
clip input level and mark it on your mixer's output level meters.
Ok, so we need to find the analog input clip level. Set up your
MediaPress for Multiplexed video+audio encoding. Choose MPEG audio as
the format. The other audio settings are not important right now. Choose
MPEG1 encoding with the multiplexing setting at System Mux. This will
make a single multiplexed mpeg1 file with audio and video.
Feed in a tone or other continuous signal into the card and encode
several seconds. Now find the encoded file and open it up with Apple's
Quicktime Player. When you play the movie file, you should hear your
tone. Is it distorted? If so, then reduce the audio level input and
encode again. Find the spot where the audio is clear and that will be
your maximum analog input level. When you hit the clip level, you will
hear a very loud and distinct distortion clip sound. It is very
Once you have that level indicated on your mixer's output level meters,
you can then adjust your analog inputs properly. For the digital audio
inputs, there are no adjustments, nor are any required.
Mac OS: 9.x
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