Over the course of several weeks we've been delivering test Jpeg2K mxf files exported from Avid to a cable network. The source is avid media they supplied of program master with a bin. They also gave us an mxf jpeg2k file for reference. The claim they are making is the loudness of the 5.1 stems are higher than they should be but the stereo tracks are okay. I know loudness isn't the same as peak and it's something I assume related to a dialogue norm type analysis.
As a correction I was able to link to the mxf file they supplied and it included bars and tone. The supplied Avid media had not bars and tone. The bars came in correct as did the tone at -20 on the Avid meters. So I made audio mixdowns of those stems and used them for the test. Still they say it did not pass. They insist there is something wrong with our gain structure.
Their suggested solution is to have us deliver ProResHQ instead. Well audio is audio has anyone heard of a reason Avid would not have unity audio gain when exporting an interleaved jpeg2K with 12 channels of audio?
When I ama back to the jpeg2K files I've made the audio appears identical and in the case of tone it is also right at +20 on Avid meters. I have no idea other than their source material was off to begin with.
What amazes me in this process is at no point did they suggest sending the bars and tone. If my bars and tone are correct there is no gain structure problem and all my internal tests, including showing the material to our protools mixer, have come up correct. How can a major network suggest a gain structure problem and not request a sample of tone? And if we have such a problem what possible difference is it delivering ProResHQ? It really feels like they just want to make the mezzanine format themselves. That I could understand.
So has anybody had issue with audio levels when exporting a jpeg2k mxf with 12 tracks of audio from Avid?
John Moore Barking Trout Productions Studio City, CA bigfish@pacbell.net
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Posted by: John Moore <bigfish@pacbell.net>
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