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More => Music, Movies, Politics, and Other Cheap Thrills => Topic started by: chrisjj on November 06, 2013, 06:21:38 pm

Title: Naming of R128 Dynamic Range
Post by: chrisjj on November 06, 2013, 06:21:38 pm: Quote from: mojave on August 13, 2013, 03:50:34 pm
JRiver is using Dynamic Range (R128) here because it probably has more meaning to people than Loudness Range.

That's really sad if true. Quantity of low-quality meaning is not worth having.
Title: Naming of R128 Dynamic Range (chrisjj)
Post by: InflatableMouse on November 07, 2013, 12:32:54 am: Quote from: chrisjj on November 06, 2013, 06:21:38 pm
That's really sad if true. Quantity of low-quality meaning is not worth having.

A few posts below that this was posted:
Quote from: Matt on August 13, 2013, 06:26:17 pm
Next build of MC19:
NEW: Added DR dynamic range analysis to the audio analyzer.
Title: Naming of R128 Dynamic Range (chrisjj)
Post by: chrisjj on November 07, 2013, 02:16:10 am: Quote from: InflatableMouse on November 07, 2013, 12:32:54 am
A few posts below that this was posted:

That does not itself demonstrate that JR is using "Dynamic Range (R128)" to refer to R128 loudness range. I hope JR will say what it does mean by "Dynamic Range (R128)".
Title: Naming of R128 Dynamic Range (chrisjj)
Post by: 6233638 on November 07, 2013, 06:53:45 am: Quote from: chrisjj on November 07, 2013, 02:16:10 am
That does not itself demonstrate that JR is using "Dynamic Range (R128)" to refer to R128 loudness range. I hope JR will say what it does mean by "Dynamic Range (R128)".
The Dynamic Range (R128) field uses the R128-derived Loudness Range (LRA) data which gives you the dynamic range of the track. (If I recall correctly, it uses the 95th percentile for peak volume and 10th percentile for minimum volume to calculate this)
The Dynamic Range (DR) field gives you TT-DR derived Crest Factor measurements, which is a measure of peak-to-average volume and may be indicative of how dynamic the mastering of a particular track is.
Title: Naming of R128 Dynamic Range (chrisjj)
Post by: mwillems on November 07, 2013, 08:06:32 am: Quote from: 6233638 on November 07, 2013, 06:53:45 am
The Dynamic Range (R128) field uses the R128-derived Loudness Range (LRA) data which gives you the dynamic range of the track. (If I recall correctly, it uses the 95th percentile for peak volume and 10th percentile for minimum volume to calculate this)
The Dynamic Range (DR) field gives you TT-DR derived Crest Factor measurements, which is a measure of peak-to-average volume and may be indicative of how dynamic the mastering of a particular track is.

6233638 is exactly right, what JRiver calls the R128 dynamic range is, to my understanding, the same as the r128-spec loudness range. Here's a recent thread on the subject that includes links to the R128 spec and some discussion of the implications of the differences between the two DR measures:

http://yabb.jriver.com/interact/index.php?topic=84489.0
Title: Naming of R128 Dynamic Range (chrisjj)
Post by: chrisjj on November 07, 2013, 07:55:04 pm: Quote from: 6233638 on November 07, 2013, 06:53:45 am
The Dynamic Range (R128) field uses the R128-derived Loudness Range (LRA) data

I'd be interested to know the source of that info.
Title: Naming of R128 Dynamic Range (chrisjj)
Post by: Hendrik on November 08, 2013, 12:45:17 am: Quote from: chrisjj on November 07, 2013, 07:55:04 pm
I'd be interested to know the source of that info.

You can believe him. :)
DR (R128) is the R128 Loudness Range value.
Title: Naming of R128 Dynamic Range (chrisjj)
Post by: chrisjj on November 08, 2013, 06:07:50 am: Quote from: Hendrik on November 08, 2013, 12:45:17 am
You can believe him.

Perhaps when I see the source.
Title: Re: Naming of R128 Dynamic Range (chrisjj)
Post by: Hendrik on November 08, 2013, 08:27:47 am: I looked into the actual source code of MC that computes those values. If you don't want to believe that, I don't know what will convince you. Compute the values with another EBU R128 compatible software and compare numbers? :D