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@hola.org/mux.js
Advanced tools
Readme
Lightweight utilities for inspecting and manipulating video container formats.
Feed in Uint8Array
s of an MPEG-2 transport stream, get out a fragmented MP4:
// create a transmuxer:
var transmuxer = new muxjs.mp4.Transmuxer(initOptions);
// data events signal a new fMP4 segment is ready:
transmuxer.on('data', function (segment) {
// Tada! Now you have an MP4 that you could use with Media Source Extensions
sourceBuffer.appendBuffer(segment.data.buffer);
});
The transmuxer can also parse out supplementary video data like timed ID3 metadata and CEA-608 captions. You can find both attached to the data event object:
transmuxer.on('data', function (segment) {
// create a metadata text track cue for each ID3 frame:
segment.metadata.frames.forEach(function(frame) {
metadataTextTrack.addCue(new VTTCue(time, time, frame.value));
});
// create a VTTCue for all the parsed CEA-608 captions:
segment.captions.forEach(function(cue) {
captionTextTrack.addCue(new VTTCue(cue.startTime, cue.endTime, cue.text));
});
});
Parse MP4s into javascript objects or a text representation for display or debugging:
// drop in a Uint8Array of an MP4:
var parsed = muxjs.inspectMp4(bytes);
// dig into the boxes:
console.log('The major brand of the first box:', parsed[0].majorBrand);
// print out the structure of the MP4:
document.body.appendChild(document.createTextNode(muxjs.textifyMp4(parsed)));
The MP4 inspector is used extensively as a debugging tool for the transmuxer. You can see it in action by cloning the project and opening the debug page in your browser.
If you're using this project in a node-like environment, just
require() whatever you need. If you'd like to package up a
distribution to include separately, run npm run build
. See the
package.json for other handy scripts if you're thinking about
contributing.
FAQs
A collection of lightweight utilities for inspecting and manipulating video container formats.
The npm package @hola.org/mux.js receives a total of 8 weekly downloads. As such, @hola.org/mux.js popularity was classified as not popular.
We found that @hola.org/mux.js demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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