FLAC1170: a ITU BS.1770 loudness scanner for FLAC Options

[pbelkner]

FLAC1770 is a ITU BS.1770 loudness scanner and tagger for FLAC. For tagging it should do exactly tha same as "metaflac".

Binaries are available for Win32, Linux, and Linux64:

• Download: https://sourceforge.net/projects/r128gain/files/flac1770/
  
• Download v0.1: https://sourceforge.net/projects/r128gain/f...s/flac1770/0.1/

CODE

$ flac1770
FLAC1170 v0.1.0, a ITU BS.1770 loudness scanner for FLAC.

Usage: flac1770 [options] <files>

Options:
  --help: dispaly this usage information and exit.
  --version: dispaly version information and exit.
  --tag: write replay gain tags to the input files (off).
  --r128: use EBU R128 compliant presets (default).
  --a85: use ATSC A/85 compliant presets.
  --rg: use ReplayGain compatible presets.
  --reference=<float>: set reference loudness (-23.0).
  --gate=<float>: set BS.1770 gate (-10.0).
  --partition=<int>: set BS.1770 partition (4).
  --unit=LU|LK|dB: use the respective loudness unit (LU).
  --progress=on|off: display progress percentage (on).
  --true-peak=fast|medium|best|off: determine inter-sample peaks (off).

Some examples:

• Analyze some individual tracks:
  CODE
  flac1770 track1.flac track2.flac track3.flac
  
  
  
• Analyze some individual tracks and write RG tags to them:
  CODE
  flac1770 --tag track1.flac track2.flac track3.flac
  
  
  
• Analyze all tracks from a folder:
  CODE
  flac1770 dir/*.flac
  
  
  
• Analyze all tracks from a folder and write RG tags to them:
  CODE
  flac1770 --tag dir/*.flac
  
  
  
• Analyze all tracks from a folder and write RG tags to them, compatible with standard ReplayGain:
  CODE
  flac1770 --rg --tag dir/*.flac
  
  
  
• Analyze all tracks from a folder, including inter-sample peak determination, and write RG tags to them, compatible with standard ReplayGain:
  CODE
  flac1770 --rg --true-peak=fast --tag dir/*.flac

This post has been edited by pbelkner: Dec 2 2012, 17:30

[jangk]

Target for EBU R128 is -23dBFS, but this possibly may be adapted in the future.

Jean

[Surfi]

Target for EBU R128 is -23dBFS, ...

::

Have a look at the loudness column in post #11, 1st list. This must be wrong for e.g.

seq-3341-2-16bit (-32.96 LUFS)
seq-3342-2-16bit (-16.82 LUFS)
seq-3342-3-16bit (-20.05 LUFS)
seq-3342-4-16bit (-24.50 LUFS)

and maybe

seq-3341-6-6channels-WAVEEX-16bit (-23.68 LUFS)
seq-3342-1-16bit (-22.60 LUFS)

too. Or are these rounding errors? I can't believe that.


Greetings, ...

::

[pbelkner]

Have a look at the loudness column in post #11, 1st list. This must be wrong for e.g.

The expected results for the test cases regarding loudness measurement according to EBU R128 are specified in the respective standards document "Loudness Metering: ‘EBU Mode’ metering to supplement loudness normalisation in accordance with EBU R 128" (http://tech.ebu.ch/docs/tech/tech3341.pdf).

"flac1770" passes all these test cases in the specified range except #6 (which is multi channel):

CODE

           expected |    measured | deviation | track
--------------------+-------------+-----------+-------------------------------
I = -23.0 ±0.1 LUFS | -22.96 LUFS |   0.04 LU | seq-3341-1-16bit.flac
I = -33.0 ±0.1 LUFS | -32.96 LUFS |   0.04 LU | seq-3341-2-16bit.flac
I = -23.0 ±0.1 LUFS | -23.03 LUFS |   0.03 LU | seq-3341-3-16bit-v02.flac
I = -23.0 ±0.1 LUFS | -23.02 LUFS |   0.02 LU | seq-3341-4-16bit-v02.flac
I = -23.0 ±0.1 LUFS | -22.99 LUFS |   0.01 LU | seq-3341-5-16bit-v02.flac
I = -23.0 ±0.1 LUFS | -23.68 LUFS |   0.68 LU | seq-3341-6-6channels-WAVEEX-16bit.flac
I = -23.0 ±0.1 LUFS | -22.99 LUFS |   0.01 LU | seq-3341-7_seq-3342-5-24bit.flac
I = -23.0 ±0.1 LUFS | -23.00 LUFS |   0.00 LU | seq-3341-2011-8_seq-3342-6-24bit-v02.flac

Please note that all these test cases inluding #6 are passed by "r128gain":

CODE

$ r128gain --fast *3341*.flac
SoX sucessfully loaded.
FFmpeg sucessfully loaded.
analyzing ...
  [1/8] "seq-3341-1-16bit.flac": -23.0 LUFS (-0.0 LU)
  [2/8] "seq-3341-2-16bit.flac": -33.0 LUFS (10.0 LU)
  [3/8] "seq-3341-2011-8_seq-3342-6-24bit-v02.flac": -23.0 LUFS (0.0 LU)
  [4/8] "seq-3341-3-16bit-v02.flac": -23.0 LUFS (0.0 LU)
  [5/8] "seq-3341-4-16bit-v02.flac": -23.0 LUFS (0.0 LU)
  [6/8] "seq-3341-5-16bit-v02.flac": -23.0 LUFS (-0.0 LU)
  [7/8] "seq-3341-6-6channels-WAVEEX-16bit.flac": -23.0 LUFS (0.0 LU)
  [8/8] "seq-3341-7_seq-3342-5-24bit.flac": -23.0 LUFS (-0.0 LU)
  [ALBUM]: -23.2 LUFS (0.2 LU)
done.

There are three other test cases specifying the expected result in the file name. These test cases are also passed in the specified range of ±0.1 LUFS:

CODE

           expected |    measured | deviation | track
--------------------+-------------+-----------+-------------------------------
I = -20.0 ±0.1 LUFS | -19.96 LUFS |   0.04 LU | 1kHz Sine -20 LUFS-16bit.flac
I = -26.0 ±0.1 LUFS | -25.96 LUFS |   0.04 LU | 1kHz Sine -26 LUFS-16bit.flac
I = -40.0 ±0.1 LUFS | -39.99 LUFS |   0.01 LU | 1kHz Sine -40 LUFS-16bit.flac

The remaning test cases are w.r.t. the loudness range. These test cases are specified in the respective document "Loudness Range: A measure to supplement loudness normalisation in accordance with EBU R 128" (http://tech.ebu.ch/docs/tech/tech3342.pdf). For these test cases there's no expected value w.r.t loudness.

"flac1770" doesn't support loudness range, i.e. w.r.t. "flac1770" these test cases are maeningless.

Please note that "r128gain" passes these test cases:

CODE

$ ~/r128gain-1.0-alpha-7-3/r128gain --fast --range  *3342*.flac
SoX sucessfully loaded.
FFmpeg sucessfully loaded.
analyzing ...
  [1/6] "seq-3341-2011-8_seq-3342-6-24bit-v02.flac": -23.0 LUFS (0.0 LU)
      range: 15.3 LU
  [2/6] "seq-3341-7_seq-3342-5-24bit.flac": -23.0 LUFS (-0.0 LU)
      range: 4.8 LU
  [3/6] "seq-3342-1-16bit.flac": -22.6 LUFS (-0.4 LU)
      range: 10.0 LU
  [4/6] "seq-3342-2-16bit.flac": -16.8 LUFS (-6.2 LU)
      range: 5.0 LU
  [5/6] "seq-3342-3-16bit.flac": -20.1 LUFS (-2.9 LU)
      range: 20.0 LU
  [6/6] "seq-3342-4-16bit.flac": -24.5 LUFS (1.5 LU)
      range: 15.0 LU
  [ALBUM]: -21.2 LUFS (-1.8 LU)
      range: 16.5 LU
done.