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IDProjectCategoryView StatusLast Update
0002647DCP-o-maticBugspublic2024-01-02 02:23
ReporterCarsten Assigned Tocarl  
Status resolvedResolutionfixed 
PlatformMacOSOS XOS Version10.12
Product Version2.16.x 
Target Version2.16.67 
Summary0002647: LEQ(m) calculation has bugs

Looks as if LEQ(m) calculation has a bug in that the results vary with the number of audio channels. E.g. the same audio gives different results when e.g. 6 channels have been assigned in the DCP, vs, 8 or 16. As a result, you may get correct LEQ(m) values when you use a 5.1 source file in a 6ch DCP, but when you create a SMPTE DCP with 8 or 16channels in the mxf, the LEQ(m) will not calculate to the same number. That doesn't seem to happen with LUFS.

I guess both LUFS and LEQ(m) should only use active channels, and there should also be a limitation to useful audio channels, that is, exclude HI/VI-N, ATMOS TC, dbox tracks, etc.

That would mean, look only at channels 1-6, 11/12, and also take into account audio matrix.


TagsNo tags attached.
Estimated weeks required
Estimated work requiredUndecided


related to 0001991 closedcarl LEQ(m) calculations probably wrong with stereo sources in 5.1 projects 



2023-11-11 00:24

administrator   ~0006062

Carsten mentioned some problems with this.


2023-11-11 16:23

manager   ~0006063

How is the channel assignment done for LUFS/R128 vs. LEQ(m)?


2023-11-11 18:57

administrator   ~0006065

Good question, it looks like LUFS/R128 only takes 5.1 and ignores anything else.


2023-11-15 13:31

administrator   ~0006071

Need to work out why Carsten gets failure to analyse audio with this branch (mentioned on the forum).


2023-11-15 13:40

manager   ~0006072

Occasionally, I get that error message when trying to analyse audio. Usually it's fixed after deleting the analysis folder.

I just set up a project to reproduce this new issue with 2.16.66devel:

Create new project. Per default, number of DCP audio channels is set to 6. Add an audio MXF with 16 channels from a DCP previously generated with DCP-o-matic. In the matrix, only channel 1-6 are assigned, 7-16 remain unassigned.
Choose 'Show Graph of audio levels'. The window opens, but it says: 'Could not analyse audio'.
Set number of DCP channels to 16 under DCP->Audio. After that, analysis is performed successfully, and it looks as if the LUFS/LEQ relationship makes sense.


2023-11-15 16:50

administrator   ~0006073

Thanks - this should be fixed now, I'll make another build.


2023-11-20 06:35

administrator   ~0006086

Hopefully all fixed in 4ae0193c125cc70176eb1660919d507fbf5378e4


2024-01-02 02:23

reporter   ~0006180

Maybe related to 0001107

Bug History

Date Modified Username Field Change
2023-11-07 15:25 Carsten New Bug
2023-11-07 15:25 Carsten Status new => assigned
2023-11-07 15:25 Carsten Assigned To => carl
2023-11-07 15:27 Carsten Description Updated
2023-11-07 15:27 Carsten Estimated work required => Undecided
2023-11-07 21:23 carl Target Version 2.16.x => 2.16.67
2023-11-07 21:26 carl Relationship added related to 0001991
2023-11-07 23:17 carl Status assigned => confirmed
2023-11-08 00:00 carl Branch => 2647-leqm
2023-11-08 00:00 carl Status confirmed => tests running
2023-11-11 00:24 carl Status tests running => feedback
2023-11-11 00:24 carl Note Added: 0006062
2023-11-11 16:23 Carsten Note Added: 0006063
2023-11-11 16:23 Carsten Status feedback => assigned
2023-11-11 18:57 carl Note Added: 0006065
2023-11-15 13:31 carl Status assigned => feedback
2023-11-15 13:31 carl Note Added: 0006071
2023-11-15 13:40 Carsten Note Added: 0006072
2023-11-15 13:40 Carsten Status feedback => assigned
2023-11-15 16:50 carl Note Added: 0006073
2023-11-19 23:03 carl Status assigned => tests running
2023-11-20 06:35 carl Status tests running => resolved
2023-11-20 06:35 carl Resolution open => fixed
2023-11-20 06:35 carl Note Added: 0006086
2024-01-02 02:23 mhm Note Added: 0006180