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70 lines
2.8 KiB
Markdown
70 lines
2.8 KiB
Markdown
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# node-m3u8stream
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Reads segments from a [m3u8 playlist][1] or [DASH MPD file][2] into a consumable stream.
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[1]: https://tools.ietf.org/html/draft-pantos-http-live-streaming-20
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[2]: https://dashif.org/docs/DASH-IF-IOP-v4.2-clean.pdf
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[](https://david-dm.org/fent/node-m3u8stream)
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[](https://codecov.io/gh/fent/node-m3u8stream)
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# Usage
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```js
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const fs = require('fs');
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const m3u8stream = require('m3u8stream')
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m3u8stream('http://somesite.com/link/to/the/playlist.m3u8')
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.pipe(fs.createWriteStream('videofile.mp4'));
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```
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# API
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### m3u8stream(url, [options])
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Creates a readable stream of binary media data. `options` can have the following
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* `begin` - Where to begin playing the video. Accepts an absolute unix timestamp or date, and a relative time in the formats `1:23:45.123` and `1m2s`.
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* `liveBuffer` - How much buffer in milliseconds to have for live streams. Default is `20000`.
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* `chunkReadahead` - How many chunks to preload ahead. Default is `3`.
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* `highWaterMark` - How much of the download to buffer into the stream. See [node's docs](https://nodejs.org/api/stream.html#stream_constructor_new_stream_writable_options) for more. Note that the actual amount buffered can be higher since each chunk request maintains its own buffer.
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* `requestOptions` - Any options you want to pass to [miniget](https://github.com/fent/node-miniget), such as `headers`.
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* `parser` - Either "m3u8" or "dash-mpd". Defaults to guessing based on the playlist url ending in `.m3u8` or `.mpd`.
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* `id` - For playlist containing multiple media options. If not given, the first representation will be picked.
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### Stream#end()
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If called, stops requesting segments, and refreshing the playlist.
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#### Event: progress
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* `Object` - Current segment with the following fields,
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- `number` - number
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- `number` - size
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- `number` - duration
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- `string` - url
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* `number` - Total number of segments.
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* `number` - Bytes downloaded up to this point.
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For static non-live playlists, emitted each time a segment has finished downloading. Since total download size is unknown until all segment endpoints are hit, progress is calculated based on how many segments are available.
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### Limitations
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Currently, it does not support [encrypted media segments](https://tools.ietf.org/html/draft-pantos-http-live-streaming-20#section-4.3.2.4). This is because the sites where this was tested on and intended for, YouTube and Twitch, don't use it.
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This does not parse master playlists, only media playlists. If you want to parse a master playlist to get links to media playlists, you can try the [m3u8 module](https://github.com/tedconf/node-m3u8).
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# Install
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npm install m3u8stream
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# Tests
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Tests are written with [mocha](https://mochajs.org)
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```bash
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npm test
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```
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