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https://github.com/dmnsgn/canvas-record

Record a video in the browser or directly on the File System from a canvas (2D/WebGL/WebGPU) as MP4, WebM, MKV, GIF, PNG/JPG Sequence using WebCodecs and Wasm when available.
https://github.com/dmnsgn/canvas-record
canvas capture download filesystem gif mp4 record video webcodecs
Last synced: 9 days ago
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Record a video in the browser or directly on the File System from a canvas (2D/WebGL/WebGPU) as MP4, WebM, MKV, GIF, PNG/JPG Sequence using WebCodecs and Wasm when available.
Host: GitHub
URL: https://github.com/dmnsgn/canvas-record
Owner: dmnsgn
License: mit
Created: 2019-06-18T10:39:52.000Z (about 5 years ago)
Default Branch: main
Last Pushed: 2024-06-10T14:24:41.000Z (18 days ago)
Last Synced: 2024-06-19T00:22:01.829Z (9 days ago)
Topics: canvas, capture, download, filesystem, gif, mp4, record, video, webcodecs
Language: JavaScript
Homepage: https://dmnsgn.github.io/canvas-record/
Size: 17.2 MB
Stars: 287
Watchers: 4
Forks: 13
Open Issues: 3
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE.md
Lists

awesome-github-star - canvas-record
README

        # canvas-record

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Record a video in the browser or directly on the File System from a canvas (2D/WebGL/WebGPU) as MP4, WebM, MKV, GIF, PNG/JPG Sequence using WebCodecs and Wasm when available.

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![](https://raw.githubusercontent.com/dmnsgn/canvas-record/main/screenshot.gif)

## Installation

```bash

npm install canvas-record

```

## Usage

```js

import { Recorder, RecorderStatus, Encoders } from "canvas-record";

import createCanvasContext from "canvas-context";

import { AVC } from "media-codecs";

// Setup

const pixelRatio = devicePixelRatio;

const width = 512;

const height = 512;

const { context, canvas } = createCanvasContext("2d", {

  width: width * pixelRatio,

  height: height * pixelRatio,

  contextAttributes: { willReadFrequently: true },

});

Object.assign(canvas.style, { width: `${width}px`, height: `${height}px` });

const mainElement = document.querySelector("main");

mainElement.appendChild(canvas);

// Animation

let canvasRecorder;

function render() {

  const width = canvas.width;

  const height = canvas.height;

  const t = canvasRecorder.frame / canvasRecorder.frameTotal || Number.EPSILON;

  context.clearRect(0, 0, width, height);

  context.fillStyle = "red";

  context.fillRect(0, 0, t * width, height);

}

const tick = async () => {

  render();

  if (canvasRecorder.status !== RecorderStatus.Recording) return;

  await canvasRecorder.step();

  if (canvasRecorder.status !== RecorderStatus.Stopped) {

    requestAnimationFrame(() => tick());

  }

};

canvasRecorder = new Recorder(context, {

  name: "canvas-record-example",

  encoderOptions: {

    codec: AVC.getCodec({ profile: "Main", level: "5.2" }),

  },

});

// Start and encode frame 0

await canvasRecorder.start();

// Animate to encode the rest

tick(canvasRecorder);

```

## API

Encoder comparison:

| Encoder        | Extension              | Required Web API   | WASM                  | Speed    |

| -------------- | ---------------------- | ------------------ | --------------------- | -------- |

| `WebCodecs`    | `mp4` / `webm` / `mkv` | WebCodecs          | ❌                    | Fast     |

| `MP4Wasm`      | `mp4`                  | WebCodecs          | ✅ (embed)            | Fast     |

| `H264MP4`      | `mp4`                  |                    | ✅ (embed)            | Medium   |

| `FFmpeg`       | `mp4` / `webm`         | SharedArrayBuffer  | ✅ (need binary path) | Slow     |

| `GIF`          | `gif`                  | WebWorkers (wip)   | ❌                    | Fast     |

| `Frame`        | `png` / `jpg`          | File System Access | ❌                    | Fast     |

| `MediaCapture` | `mkv` / `webm`         | MediaStream        | ❌                    | Realtime |

Note:

- `WebCodecs` encoderOptions allow different codecs to be used: VP8/VP9/AV1/HEVC. See [media-codecs](https://github.com/dmnsgn/media-codecs) to get a codec string from human readable options and check which ones are supported in your browser with [github.io/media-codecs](https://dmnsgn.github.io/media-codecs/).

- `WebCodecs` 5-10x faster than H264MP4Encoder and 20x faster than `FFmpeg` (it needs to mux files after writing png to virtual FS)

- `FFmpeg` (mp4 and webm) and `WebCodecs` (mp4) have a AVC maximum frame size of 9437184 pixels. That's fine until a bit more than 4K 16:9 @ 30fps. So if you need 4K Square or 8K exports, be patient with `H264MP4Encoder` (which probably also has the 4GB memory limit) or use Frame encoder and mux them manually with `FFmpeg` CLI (`ffmpeg -framerate 30 -i "%05d.jpg" -b:v 60M -r 30 -profile:v baseline -pix_fmt yuv420p -movflags +faststart output.mp4`)

- `MP4Wasm` is embedded from [mp4-wasm](https://github.com/mattdesl/mp4-wasm/) for ease of use (`FFmpeg` will require `encoderOptions.corePath`)

Roadmap:

- [ ] add debug logging

- [ ] use WebWorkers for gifenc

## Modules



canvas-record



Re-export Recorder, RecorderStatus, all Encoders and utils.





## Classes



Recorder



Encoder



FFmpegEncoder



FrameEncoder



GIFEncoder



H264MP4Encoder



MediaCaptureEncoder



MP4WasmEncoder



WebCodecsEncoder





## Constants





isWebCodecsSupported : boolean





Check for WebCodecs support on the current platform.





## Functions





estimateBitRate(width, height, frameRate, motionRank, bitrateMode) ⇒ number





Estimate the bit rate of a video rounded to nearest megabit.

Based on "H.264 for the rest of us" by Kush Amerasinghe.





## Typedefs





onStatusChangeCb : function





A callback to notify on the status change. To compare with RecorderStatus enum values.





RecorderOptions : object





Options for recording. All optional.





RecorderStartOptions : object





Options for recording initialisation. All optional.





EncoderExtensions : "mp4" | "webm" | "png" | "jpg" | "gif" | "mkv"







EncoderTarget : "in-browser" | "file-system"







FFmpegEncoderOptions : object







FFmpegEncoderEncoderOptions : module:@ffmpeg/ffmpeg/dist/esm/types.js~FFMessageLoadConfig







GIFEncoderOptions : object







GIFEncoderQuantizeOptions : object







GIFEncoderEncoderOptions : object







H264MP4EncoderOptions : object







H264MP4EncoderEncoderOptions : module:h264-mp4-encoder~H264MP4Encoder







MediaCaptureEncoderOptions : object







MediaCaptureEncoderEncoderOptions : MediaRecorderOptions







MP4WasmEncoderOptions : object







MP4WasmEncoderEncoderOptions : VideoEncoderConfig







WebCodecsEncoderOptions : object







WebCodecsEncoderEncoderOptions : VideoEncoderConfig







WebCodecsMuxerOptions : MuxerOptions









## canvas-record

Re-export Recorder, RecorderStatus, all Encoders and utils.



## Recorder

**Kind**: global class

- [Recorder](#Recorder)

  - [new Recorder(context, [options])](#new_Recorder_new)

  - [.defaultOptions](#Recorder+defaultOptions) : [RecorderOptions](#RecorderOptions)

  - [.mimeTypes](#Recorder+mimeTypes) : object

  - [.start([startOptions])](#Recorder+start)

  - [.step()](#Recorder+step)

  - [.stop()](#Recorder+stop) ⇒ ArrayBuffer \| Uint8Array \| Array.<Blob> \| undefined

  - [.dispose()](#Recorder+dispose)



### new Recorder(context, [options])

Create a Recorder instance

| Param     | Type                                             | Default         |

| --------- | ------------------------------------------------ | --------------- |

| context   | RenderingContext                    |                 |

| [options] | [RecorderOptions](#RecorderOptions) | {} |



### recorder.defaultOptions : [RecorderOptions](#RecorderOptions)

Sensible defaults for recording so that the recorder "just works".

**Kind**: instance property of [Recorder](#Recorder)



### recorder.mimeTypes : object

A mapping of extension to their mime types

**Kind**: instance property of [Recorder](#Recorder)



### recorder.start([startOptions])

Start the recording by initializing and optionally calling the initial step.

**Kind**: instance method of [Recorder](#Recorder)

| Param          | Type                                                       | Default         |

| -------------- | ---------------------------------------------------------- | --------------- |

| [startOptions] | [RecorderStartOptions](#RecorderStartOptions) | {} |



### recorder.step()

Encode a frame and increment the time and the playhead.

Calls `await canvasRecorder.stop()` when duration is reached.

**Kind**: instance method of [Recorder](#Recorder)



### recorder.stop() ⇒ ArrayBuffer \| Uint8Array \| Array.<Blob> \| undefined

Stop the recording and return the recorded buffer.

If options.download is set, automatically start downloading the resulting file.

Is called when duration is reached or manually.

**Kind**: instance method of [Recorder](#Recorder)



### recorder.dispose()

Clean up the recorder and encoder

**Kind**: instance method of [Recorder](#Recorder)



## Encoder

**Kind**: global class

**Properties**

| Name             | Type                                                 |

| ---------------- | ---------------------------------------------------- |

| target           | [EncoderTarget](#EncoderTarget)         |

| extension        | [EncoderExtensions](#EncoderExtensions) |

| [encoderOptions] | object                                  |

| [muxerOptions]   | object                                  |

- [Encoder](#Encoder)

  - [new Encoder(options)](#new_Encoder_new)

  - [.supportedExtensions](#Encoder+supportedExtensions) : Array.<Extensions>

  - [.supportedTargets](#Encoder+supportedTargets) : [Array.<EncoderTarget>](#EncoderTarget)

  - [.init(options)](#Encoder+init)

  - [.encode(frame, [frameNumber])](#Encoder+encode)

  - [.stop()](#Encoder+stop) ⇒ ArrayBuffer \| Uint8Array \| Array.<Blob> \| undefined

  - [.dispose()](#Encoder+dispose)



### new Encoder(options)

Base Encoder class. All Encoders extend it and its method are called by the Recorder.

| Param   | Type                |

| ------- | ------------------- |

| options | object |



### encoder.supportedExtensions : Array.<Extensions>

The extension the encoder supports

**Kind**: instance property of [Encoder](#Encoder)



### encoder.supportedTargets : [Array.<EncoderTarget>](#EncoderTarget)

The target to download the file to.

**Kind**: instance property of [Encoder](#Encoder)



### encoder.init(options)

Setup the encoder: load binary, instantiate muxers, setup file system target...

**Kind**: instance method of [Encoder](#Encoder)

| Param   | Type                |

| ------- | ------------------- |

| options | object |



### encoder.encode(frame, [frameNumber])

Encode a single frame. The frameNumber is usually used for GOP (Group Of Pictures).

**Kind**: instance method of [Encoder](#Encoder)

| Param         | Type                |

| ------------- | ------------------- |

| frame         | number |

| [frameNumber] | number |



### encoder.stop() ⇒ ArrayBuffer \| Uint8Array \| Array.<Blob> \| undefined

Stop the encoding process and cleanup the temporary data.

**Kind**: instance method of [Encoder](#Encoder)



### encoder.dispose()

Clean up the encoder

**Kind**: instance method of [Encoder](#Encoder)



## FFmpegEncoder

**Kind**: global class



### new FFmpegEncoder([options])

| Param     | Type                                                       |

| --------- | ---------------------------------------------------------- |

| [options] | [FFmpegEncoderOptions](#FFmpegEncoderOptions) |



## FrameEncoder

**Kind**: global class



## GIFEncoder

**Kind**: global class



### new GIFEncoder([options])

| Param     | Type                                                 |

| --------- | ---------------------------------------------------- |

| [options] | [GIFEncoderOptions](#GIFEncoderOptions) |



## H264MP4Encoder

**Kind**: global class



### new H264MP4Encoder([options])

| Param     | Type                                                         |

| --------- | ------------------------------------------------------------ |

| [options] | [H264MP4EncoderOptions](#H264MP4EncoderOptions) |



## MediaCaptureEncoder

**Kind**: global class



### new MediaCaptureEncoder([options])

| Param     | Type                                                                   |

| --------- | ---------------------------------------------------------------------- |

| [options] | [MediaCaptureEncoderOptions](#MediaCaptureEncoderOptions) |



## MP4WasmEncoder

**Kind**: global class



### new MP4WasmEncoder([options])

| Param     | Type                                                         |

| --------- | ------------------------------------------------------------ |

| [options] | [MP4WasmEncoderOptions](#MP4WasmEncoderOptions) |



## WebCodecsEncoder

**Kind**: global class



### new WebCodecsEncoder([options])

| Param     | Type                                                             |

| --------- | ---------------------------------------------------------------- |

| [options] | [WebCodecsEncoderOptions](#WebCodecsEncoderOptions) |



## RecorderStatus : enum

Enum for recorder status

**Kind**: global enum

**Read only**: true

**Example**

```js

// Check recorder status before continuing

if (canvasRecorder.status !== RecorderStatus.Stopped) {

  rAFId = requestAnimationFrame(() => tick());

}

```



## isWebCodecsSupported : boolean

Check for WebCodecs support on the current platform.

**Kind**: global constant



## estimateBitRate(width, height, frameRate, motionRank, bitrateMode) ⇒ number

Estimate the bit rate of a video rounded to nearest megabit.

Based on "H.264 for the rest of us" by Kush Amerasinghe.

**Kind**: global function

**Returns**: number - A bitrate value in bits per second

| Param       | Type                                                                   | Default               | Description           |

| ----------- | ---------------------------------------------------------------------- | --------------------- | --------------------- |

| width       | number                                                    |                       |                       |

| height      | number                                                    |                       |                       |

| frameRate   | number                                                    | 30       |                       |

| motionRank  | number                                                    | 4        | A factor of 1, 2 or 4 |

| bitrateMode | "variable" \| "constant" | variable |                       |

**Example**

```js

// Full HD (1080p)

const bitRate = estimateBitRate(1920, 1080, 30, "variable");

const bitRateMbps = bitRate * 1_000_000; // => 13 Mbps

```



## onStatusChangeCb : function

A callback to notify on the status change. To compare with RecorderStatus enum values.

**Kind**: global typedef

| Param          | Type                | Description |

| -------------- | ------------------- | ----------- |

| RecorderStatus | number | the status  |



## RecorderOptions : object

Options for recording. All optional.

**Kind**: global typedef

**Properties**

| Name             | Type                                               | Default                                           | Description                                                                                                             |

| ---------------- | -------------------------------------------------- | ------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------- |

| [name]           | string                                | "\"\""           | A name for the recorder, used as prefix for the default file name.                                                      |

| [duration]       | number                                | 10                                   | The recording duration in seconds. If set to Infinity, `await canvasRecorder.stop()` needs to be called manually.       |

| [frameRate]      | number                                | 30                                   | The frame rate in frame per seconds. Use `await canvasRecorder.step();` to go to the next frame.                        |

| [download]       | boolean                               | true                                 | Automatically download the recording when duration is reached or when `await canvasRecorder.stop()` is manually called. |

| [extension]      | string                                | "\"mp4\""        | Default file extension: infers which Encoder is selected.                                                               |

| [target]         | string                                | "\"in-browser\"" | Default writing target: in-browser or file-system when available.                                                       |

| [encoder]        | object                                |                                                   | A specific encoder. Default encoder based on options.extension: GIF > WebCodecs > H264MP4.                              |

| [encoderOptions] | object                                |                                                   | See `src/encoders` or individual packages for a list of options.                                                        |

| [muxerOptions]   | object                                |                                                   | See "mp4-muxer" and "webm-muxer" for a list of options.                                                                 |

| [onStatusChange] | [onStatusChangeCb](#onStatusChangeCb) |                                                   |                                                                                                                         |



## RecorderStartOptions : object

Options for recording initialisation. All optional.

**Kind**: global typedef

**Properties**

| Name       | Type                 | Description                                                                   |

| ---------- | -------------------- | ----------------------------------------------------------------------------- |

| [filename] | string  | Overwrite the file name completely.                                           |

| [initOnly] | boolean | Only initialised the recorder and don't call the first await recorder.step(). |



## EncoderExtensions : "mp4" \| "webm" \| "png" \| "jpg" \| "gif" \| "mkv"

**Kind**: global typedef



## EncoderTarget : "in-browser" \| "file-system"

**Kind**: global typedef



## FFmpegEncoderOptions : object

**Kind**: global typedef

**Properties**

| Name             | Type                                                                     | Default         |

| ---------------- | ------------------------------------------------------------------------ | --------------- |

| [encoderOptions] | [FFmpegEncoderEncoderOptions](#FFmpegEncoderEncoderOptions) | {} |



## FFmpegEncoderEncoderOptions : module:@ffmpeg/ffmpeg/dist/esm/types.js~FFMessageLoadConfig

**Kind**: global typedef

**See**: [FFmpeg#load](https://ffmpegwasm.netlify.app/docs/api/ffmpeg/classes/FFmpeg#load)



## GIFEncoderOptions : object

**Kind**: global typedef

**Properties**

| Name              | Type                                                                 | Default          |

| ----------------- | -------------------------------------------------------------------- | ---------------- |

| [maxColors]       | number                                                  | 256 |

| [quantizeOptions] | [GIFEncoderQuantizeOptions](#GIFEncoderQuantizeOptions) |                  |

| [encoderOptions]  | [GIFEncoderEncoderOptions](#GIFEncoderEncoderOptions)   | {}  |



## GIFEncoderQuantizeOptions : object

**Kind**: global typedef

**See**: [QuantizeOptions](https://github.com/mattdesl/gifenc#palette--quantizergba-maxcolors-options--)

**Properties**

| Name                  | Type                                                                                                    | Default                         |

| --------------------- | ------------------------------------------------------------------------------------------------------- | ------------------------------- |

| [format]              | "rgb565" \| "rgb444" \| "rgba4444" | "rgb565" |

| [oneBitAlpha]         | boolean \| number                                                             | false              |

| [clearAlpha]          | boolean                                                                                    | true               |

| [clearAlphaThreshold] | number                                                                                     | 0                  |

| [clearAlphaColor]     | number                                                                                     | 0x00               |



## GIFEncoderEncoderOptions : object

**Kind**: global typedef

**See**: [WriteFrameOpts](https://github.com/mattdesl/gifenc#gifwriteframeindex-width-height-opts--)

**Properties**

| Name               | Type                                            | Default            |

| ------------------ | ----------------------------------------------- | ------------------ |

| [palette]          | Array.<Array.<number>> |                    |

| [first]            | boolean                            | false |

| [transparent]      | boolean                            | 0     |

| [transparentIndex] | number                             | 0     |

| [delay]            | number                             | 0     |

| [repeat]           | number                             | 0     |

| [dispose]          | number                             | -1    |



## H264MP4EncoderOptions : object

**Kind**: global typedef

**Properties**

| Name             | Type                                                                       | Default         |

| ---------------- | -------------------------------------------------------------------------- | --------------- |

| [debug]          | boolean                                                       |                 |

| [encoderOptions] | [H264MP4EncoderEncoderOptions](#H264MP4EncoderEncoderOptions) | {} |



## H264MP4EncoderEncoderOptions : module:h264-mp4-encoder~H264MP4Encoder

**Kind**: global typedef

**See**: [h264-mp4-encoder#api](https://github.com/TrevorSundberg/h264-mp4-encoder#api)



## MediaCaptureEncoderOptions : object

**Kind**: global typedef

**Properties**

| Name             | Type                                                                                 | Default         |

| ---------------- | ------------------------------------------------------------------------------------ | --------------- |

| [flushFrequency] | number                                                                  | 10 |

| [encoderOptions] | [MediaCaptureEncoderEncoderOptions](#MediaCaptureEncoderEncoderOptions) | {} |



## MediaCaptureEncoderEncoderOptions : MediaRecorderOptions

**Kind**: global typedef

**See**: [MediaRecorder#options](https://developer.mozilla.org/en-US/docs/Web/API/MediaRecorder/MediaRecorder#options)



## MP4WasmEncoderOptions : object

**Kind**: global typedef

**Properties**

| Name              | Type                                                                       | Default         |

| ----------------- | -------------------------------------------------------------------------- | --------------- |

| [groupOfPictures] | number                                                        | 20 |

| [flushFrequency]  | number                                                        | 10 |

| [encoderOptions]  | [MP4WasmEncoderEncoderOptions](#MP4WasmEncoderEncoderOptions) | {} |



## MP4WasmEncoderEncoderOptions : VideoEncoderConfig

**Kind**: global typedef

**See**: [VideoEncoder.configure](https://developer.mozilla.org/en-US/docs/Web/API/VideoEncoder/configure#config)



## WebCodecsEncoderOptions : object

**Kind**: global typedef

**Properties**

| Name              | Type                                                                           | Default         |

| ----------------- | ------------------------------------------------------------------------------ | --------------- |

| [groupOfPictures] | number                                                            | 20 |

| [flushFrequency]  | number                                                            | 10 |

| [encoderOptions]  | [WebCodecsEncoderEncoderOptions](#WebCodecsEncoderEncoderOptions) | {} |



## WebCodecsEncoderEncoderOptions : VideoEncoderConfig

**Kind**: global typedef

**See**: [VideoEncoder.configure](https://developer.mozilla.org/en-US/docs/Web/API/VideoEncoder/configure#config)



## WebCodecsMuxerOptions : MuxerOptions

**Kind**: global typedef

**See**

- [Mp4.MuxerOptions](https://github.com/Vanilagy/mp4-muxer/#usage)

- [WebM.MuxerOptions](https://github.com/Vanilagy/webm-muxer/#usage)

## License

All MIT:

- [mp4-wasm](https://github.com/mattdesl/mp4-wasm/blob/master/LICENSE.md)

- [h264-mp4-encoder](https://github.com/TrevorSundberg/h264-mp4-encoder/blob/master/LICENSE.md)

- [@ffmpeg/ffmpeg](https://github.com/ffmpegwasm/ffmpeg.wasm/blob/master/LICENSE)

- [gifenc](https://github.com/mattdesl/gifenc/blob/master/LICENSE.md)

- [webm-muxer](https://github.com/Vanilagy/webm-muxer/blob/main/LICENSE)

- [mp4-muxer](https://github.com/Vanilagy/mp4-muxer/blob/main/LICENSE)

MIT. See [license file](https://github.com/dmnsgn/canvas-record/blob/main/LICENSE.md).