Spot MXF Loudness Check
Validate the loudness of a MXF file against the SPOT recommendations
by BeatRig
Checks the audio (loudness) part of the S.P.O.T. specification in MXF files. These files are the standard for dutch broadcasters like the STER.
Handling
Input
MXF file conform the S.P.O.T. guidelines.
The typical thing about these files is that they contain 8 mono audio stream that together form a stereo and a surround (5.1) stream:
- 1 = Left Stereo (Lo/Lt)
- 2 = Right Stereo (Ro/Rt)
- 3 = Left Front
- 4 = Right Front
- 5 = Centre
- 6 = LFE
- 7 = Left Surround
- 8 = Right Surround
If there is no surround mix channels 3 to 8 should still be present but audio should be muted.
Validate
- 8 mono streams, 1-2 for a required stereo mix, 3-8 for the optional surround mix
- 24bits / 48kHz audio format
- Program Loudness ‒23 LUFS (±0.5 LU) (required for stereo, surround only if present)
- Maximum Short Term Loudness +5 LU (required for stereo, surround only if present)
- Maximum Signal Level ‒1 dBTP (required for stereo, surround only if present)