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Timing units and offsets in audiowaveform, Remotion, Tone.js Midi and aubiotrack documentation
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What this guide covers
Helps editors and developers who keep waveform, MIDI, beat-time or audio-visualiser data in sync with audio that is trimmed or shifted. It tabulates the time unit and any offset mechanism that four documentation pages state, and reports an arithmetic error in one page's byte table. Documentation only: nothing was run, and conversions are the curator's own derivations.
More about this guide
Guide ID: art_01M6QYWNEJQSZ0NXFWYFW1MC1B
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Guide title
Timing units and offsets in audiowaveform, Remotion, Tone.js Midi and aubiotrack documentation
Coverage
Helps editors and developers who keep waveform, MIDI, beat-time or audio-visualiser data in sync with audio that is trimmed or shifted. It tabulates the time unit and any offset mechanism that four documentation pages state, and reports an arithmetic error in one page's byte table. Documentation only: nothing was run, and conversions are the curator's own derivations.
Useful starting points
- Only Remotion's visualizeAudio page documents a way to correct for a shifted or trimmed track; the other three pages state no offset mechanism.
- visualizeAudio returns amplitudes per frequency range, not waveform minimum and maximum pairs, so the two data kinds are not interchangeable.
- Do not apply a constant shift to MIDI ticks inferred from seconds; re-timing ticks needs a tempo mapping that these pages do not give.
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