Not sure if it is of any help, but when I've delivered ProRes HQ masters with full surround and stereo plus stems (up to 24 track masters), I've done mono mixdowns for every track and then output same as source. The output file is subsequently measured and no change in level occurs. So at least you know for sure MC is not summing or doing something funky to the levels when mixing down, provided you are doing a single mono mixdown per track.
Who mixed your program? Shouldn't you pass this "note" along to that person and have them re-output to spec?
On Tue, Oct 31, 2017 at 10:24 AM, Bogdan Grigorescu bogdan_grigorescu@yahoo.com [Avid-L2] <Avid-L2@yahoogroups.com> wrote:
not sure if audition will be able to read your mxf file, you may need to extract audio and then analyze it.BG
From: "bigfish@pacbell.net [Avid-L2]" <Avid-L2@yahoogroups.com>
To: Avid-L2@yahoogroups.com
Sent: Monday, October 30, 2017 10:08 PM
Subject: Re: [Avid-L2] Today's QC corner
I've never run Audition other than once to try and process an aaf for protools on a premier project. I don't see audition on my system although I had an icon in the dock, weird. I'll have to look into this tomorrow. It sounds like audition will run an analysis. Would it do that on avid media as that is what I was given by the network? I also have the mxf mezzanine format file they gave me. Would audition handle that?
Am I correct that you are saying that Audition will run an analysis of the original source files I was given?
---In Avid-L2@yahoogroups.com, <bogdan_grigorescu@...> wrote :As I said, run the 5.1 through audition(make sure you choose BS.1770-1 algorithm) and see what the result is.Target should be -23/-24LKFS.BG
From: "bigfish@... [Avid-L2]" <Avid-L2@yahoogroups.com>
To: Avid-L2@yahoogroups.com
Sent: Monday, October 30, 2017 5:47 PM
Subject: Re: [Avid-L2] Today's QC corner
Here is all we were given:Measured Loudness (LKFS, BS.1770-1) - English 5.1Out of Range
---In Avid-L2@yahoogroups.com, <bigfish@...> wrote :Correct loudness is not the same as levels but if they point out gain structure then tone is a simple way to prove that is correct. I've not run Audition much and they gave us no specific spec that was out just a generic loudness was greater.
Is there some feature in audition that would allow a direct comparison of two files to see if levels match?
---In Avid-L2@yahoogroups.com, <bogdan_grigorescu@...> wrote :loudness is not the same as levels.run your stems through Audition and see what it comes up with.make sure to not include commercial breaks, lineup or textless.BG
From: "John Moore bigfish@... [Avid-L2]" <Avid-L2@yahoogroups.com>
To: Yahoogroups <avid-l2@yahoogroups.com>; Yahoogroups <editing-list@yahoogroups.com>
Sent: Monday, October 30, 2017 4:43 PM
Subject: [Avid-L2] Today's QC cornerOver 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@...
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Posted by: Mark Spano <cutandcover@gmail.com>
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this is the Avid-L2
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