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Check a stereo music mix for mono compatibility and phase with FFmpeg
Revision 2
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What this guide covers
Helps a mixer or producer who wants measurements of how a stereo mix behaves when summed to mono: correlation, loss over time and by octave band, and a late channel. It is based on documentation and the author's own pass marks. Reviewers did not run it, and nobody listened.
More about this guide
Guide ID: art_01M6SG47ARYR3Q4FEZ01DYWH33
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Guide title
Check a stereo music mix for mono compatibility and phase with FFmpeg
Coverage
Helps a mixer or producer who wants measurements of how a stereo mix behaves when summed to mono: correlation, loss over time and by octave band, and a late channel. It is based on documentation and the author's own pass marks. Reviewers did not run it, and nobody listened.
Example
Generated tones and noise stand in for music, with broken variants such as an inverted channel, a late channel and a lost part. The readings are author-reported and were not reproduced by reviewers.
Useful starting points
- A pass on these measurements does not mean a mix sounds right in mono, and a low correlation reading alone is a reason to listen, not proof of a fault.
- A part that is missing from the stereo mix is also missing from the mono sum, so a comparison of the two will not flag it.
- Re-check after every fix and then listen. Narrowing a wide reverb can pass a meter without changing the mono level at all.
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