npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

@wfoxall/timeframe

v1.2.0

Published

A javascript library for parsing and manipulation of SMPTE/EBU/Generic timecodes, framerates and framecounts.

Downloads

11

Readme

Timeframe

A javascript library for parsing and manipulation of SMPTE/EBU/Generic timecodes, framerates and framecounts.

Install

npm install @wfoxall/timeframe

Usage

Timecode Class

Import the Timecode class and create an instance.

import {Timecode} from '@wfoxall/timeframe';

const tc = new Timecode('00:01:02:03',"29.97DF");

console.log(tc.toString());
// 00;01;02;03

A TimecodeError is thrown if the supplied string or framerate are invalid or incompatible. And the toString() class will take care of formatting the timecode correctly (e.g. semicolons for drop timecode).

Timecodes can be instantiated from a string or framecount, and the framerate can be expressed in any of several ways too (see Framerate class):

const tc1 = new Timecode('00:01:01:00',"29.97DF");
console.log(tc1.toString());
// 00;01;01;00

const tc2 = new Timecode('00:01:02:15',{denom:1001,numer:30000,drop:true});
console.log(tc2.toString());
// 00;01;02;15

const tc3 = new Timecode(12345,29.97); // 29.97 and 59.94 numbers are interpretted as drop-frame by default
console.log(tc3.toString());
// 00;06;51;27

You can add and subtract timecodes (with matching framerates) using the static method on the Timecode class, or with the method on an existing timecode object:

let sum = Timecode.add(tc1,tc2); // Immutable - tc1 and tc2 remain unchanged.
console.log(sum.toString());
// 00;02;03;15

tc1.addTimecode(tc3); // Mutable - tc1 is changed
console.log(tc1.toString());
// 00;07;52;27

Framerate Class

Framerate objects can be instantiated by passing a FramerateLike value. This can be a string, number or object as follows:

let fr1 = "59.94DF"
let fr2 = 59.94
let fr3 = {numer:60000,denom:1001,drop:true}

This is particularly useful when marshalling framerates from various formats. For example, some video APIs like to express framerates as a fraction (eg. 29.97 is expressed as 30000/1001).

The resulting Framerate instance can then be used to initialize a Timecode instance.

import {Framerate} from '@wfoxall/timeframe';

let fr1 = new Framerate(29.97);
console.log(fr1.toString());
// 29.97DF

const tc = new Timecode("01:59:59:28",fr1);
console.log(tc.toString());
// 01;59;59;28

As framerates can be expressed in multiple formats, this is useful for marshelling the same framerate into the same uniform type. For example, the following are the same framerate:

let fr1 = "59.94DF"
let fr2 = 59.94
let fr3 = {numer:60000,denom:1001,drop:true}

Credit

The logic in the framesToTimecode function is based on a Stack Overflow answer by Ichthyo.