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node-av / lib / avRescaleDelta

Function: avRescaleDelta() ​

avRescaleDelta(inTb, inTs, fsTb, duration, lastRef, outTb): bigint

Defined in: src/lib/utilities.ts:891

Rescale a timestamp while preserving accuracy with coarse input timebases.

Used for audio streamcopy to maintain accuracy when input timebase is coarse. Direct mapping to av_rescale_delta().

Parameters ​

inTb ​

IRational

Input timebase

inTs ​

Input timestamp

number | bigint

fsTb ​

IRational

Duration timebase (e.g., {1, sampleRate})

duration ​

number

Duration in fsTb units

lastRef ​

Reference object with value property (modified by function)

value ​

bigint

Last output timestamp (bigint)

outTb ​

IRational

Output timebase

Returns ​

bigint

Rescaled timestamp

Example ​

typescript
const inTb = { num: 1, den: 48000 };
const inTs = 1000000n;
const fsTb = { num: 1, den: 44100 };
const duration = 1024;
const lastRef = { value: 0n };
const outTb = { num: 1, den: 96000 };

const rescaled = avRescaleDelta(inTb, inTs, fsTb, duration, lastRef, outTb);

See ​

av_rescale_delta - FFmpeg Doxygen