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https://github.com/chijete/crafyvideojs

FAST In-browser javascript MP4 video decode and encode library
https://github.com/chijete/crafyvideojs

bitrate fast-video-frame-extraction h264-avc h264-decoder h264-encoder h264-parser hardware-acceleration in-browser-javascript mp4-files mp4-video mp4box video-editing video-processing video-resolution videocuttool videodecode videoencoder videoencoding videotrimming webgl

Last synced: 3 months ago
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FAST In-browser javascript MP4 video decode and encode library

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README 

        
# CrafyVideoJS



**CrafyVideoJS** is a lightweight, hardware-accelerated (GPU) client-side JavaScript library for manipulating, decoding, and encoding MP4 H.264 (AVC) videos directly in the browser. By leveraging the browser's `VideoEncoder` and `VideoDecoder` APIs combined with [mp4box.js](https://github.com/gpac/mp4box.js "mp4box.js"), this library provides fast and efficient video processing without requiring server-side support.



## Features



- ✂ī¸ **Cut videos**: Trim a video to a specific start and end time.

- ⚙ī¸ **Adjust bitrate**: Modify the output video's bitrate.

- đŸŽĨ **Change resolution**: Resize videos while maintaining aspect ratio.

- ℹī¸ **Video info extraction**: Retrieve metadata and structural information.

- 🛠ī¸ **Decode and encode**: Perform decoding and encoding of both video and audio tracks.



## Installation



**Requirement:** [mp4box.js](https://github.com/gpac/mp4box.js "mp4box.js") library. 



You can use the file hosted in this repository:



```html



```



Simply include the library in your project:



```html



```



For production environments, use the minified version:



```html



```



**Note:** It only works in modern browsers that support [VideoEncoder](https://developer.mozilla.org/en-US/docs/Web/API/VideoEncoder/ "VideoEncoder") and [VideoDecoder](https://developer.mozilla.org/en-US/docs/Web/API/VideoDecoder/ "VideoDecoder").



## Live Demo



Check out the [online demo](https://chijete.github.io/CrafyVideoJS/) to see CrafyVideoJS in action!



---



## Documentation



### Example of use



```javascript

var CrafyVideoJS_instance = new CrafyVideoJS();



// Input video must be MP4 H.264 (avc) or MP4 H.265 (hvc)

function onInputFileChange(file) {

	var reader = new FileReader();

	reader.onload = function () {

		CrafyVideoJS_instance.onProgress = function (progressData) {

			console.log("ETA in ms:", progressData['video']['eta']);

		};

		CrafyVideoJS_instance.onResult = function (result) {

			console.log("Link to output video:", URL.createObjectURL(new Blob([result['video_array_buffer']], { type: "video/mp4" })));

		};

		CrafyVideoJS_instance.onError = function (error) {

      console.error("Error:", error);

    };

    // Video compression example, setting max bitrate and max resolution (720p):

		CrafyVideoJS_instance.processVideo({

			file: this.result,

			max_video_bitrate: 1_500_000,

			max_video_resolution: 1280

		});

	};

	reader.readAsArrayBuffer(file);

}

```



### `CrafyVideoJS.onProgress`



This **event** is fired every time a sample is decoded or encoded.



#### Object as parameter



```json

{

  "video": {

    "decoding": {

      "index": 11,

      "count": 1000,

      "percentage": 1,

      "percentage_original": 1.1,

      "eta": 11.5236

    },

    "encoding": {

      "index": 11,

      "count": 1000,

      "percentage": 1,

      "percentage_original": 1.1,

      "eta": 9.5235

    },

    "eta": 12.123456

  },

  "audio": {

    "decoding": {

      "index": 11,

      "count": 1000,

      "percentage": 1,

      "percentage_original": 1.1

    },

    "encoding": {

      "index": 11,

      "count": 1000,

      "percentage": 1,

      "percentage_original": 1.1

    }

  }

}

```



- `"count"` is the total number of samples.

- `"index"` is the index of the last sample processed.

- `"percentage"` is rounded.

- `"eta"` is in miliseconds.



### `CrafyVideoJS.onResult`



This **event** is triggered when the encoding of the output video finishes successfully.



#### Object as parameter



| Key                            | Type                 | Description                            |

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

| `video_array_buffer`           | `ArrayBuffer`        | Output video as an `ArrayBuffer`.      |

| `reencoding_time_seconds`      | `float`              | Total processing time in seconds.      |

| `reencoding_video_frames`      | `int`                | Total number of encoded video samples.      |

| `reencoding_video_fps`         | `int`                | Average number of encoded video samples per second.      |

| `reencoding_audio_frames`      | `int`                | Total number of encoded audio samples.      |

| `reencoding_audio_fps`         | `int`                | Average number of encoded audio samples per second.      |



### `CrafyVideoJS.onError`



This **event** is triggered when a fatal error occurs, that is, processing stops completely due to a problem.



#### Parameters



| Parameter         | Type          | Description                           |

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

| `error`           | `error`       | Error info                            |



### `CrafyVideoJS.processVideo(options)`



This is the main function to load a video as an `ArrayBuffer`, decode it, apply transformations, and re-encode it.



#### Parameters



| Parameter                         | Type          | Default         | Description                                                                                                       |

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

| `file`                            | `ArrayBuffer` | **Required**    | Input video file as an `ArrayBuffer`.                                                                             |

| `start_timestamp`                 | `int`         | `false`         | (Optional) Start trimming the video from this timestamp (in microseconds).                                        |

| `end_timestamp`                   | `int`         | `false`         | (Optional) Trim the video up to this timestamp (in microseconds).                                                 |

| `max_video_bitrate`               | `int`         | `false`         | (Optional) Set the maximum output video bitrate (in bits). If the bitrate of the input video is lower, it will not be modified.                                                        |

| `max_video_resolution`            | `int`         | `false`         | (Optional) Defines the longest edge of the output video in pixels (example: 1920 for 1080p, 1280 for 720p, etc). If the video resolution is lower, it will not be modified.  |

| `queue_max_size`                  | `int`         | `10`            | (Optional) Maximum number of video frames in the processing queue. (A larger number will increase parallel graphics calculations and provide a slight speed improvement, but may cause a bottleneck. A value greater than 15 is not recommended.)                                                       |

| `redimension_system`              | `string`      | `'bitmap'`      | (Optional) Video resizing method: `"webgl"` or `"bitmap"`. (`"bitmap"` is the recommended option). [reference](https://developer.mozilla.org/es/docs/Web/API/Window/createImageBitmap "reference")                |

| `encoder_latencyMode`             | `string`      | `'quality'`     | (Optional) Encoder latency mode: `"quality"` or `"realtime"`. [reference](https://developer.mozilla.org/en-US/docs/Web/API/VideoEncoder/configure#latencymode "reference")                                                     |

| `video_info_read_max_time`        | `int`         | `60000`         | (Optional) Maximum time (in milliseconds) to retrieve input video information. If this time limit is exceeded, an error is returned.                                          |

| `redimension_resizeQuality`       | `string`      | `'low'`         | (Optional) Resize quality: `"pixelated"`, `"low"`, `"medium"`, or `"high"`. [reference](https://developer.mozilla.org/es/docs/Web/API/Window/createImageBitmap#options "reference")                                       |

| `max_input_video_size`            | `int`         | `false`         | (Optional) Maximum input video file size in bytes. If the input video exceeds this size, an error is returned.                                                                |

| `max_input_video_samplesCount`    | `int`         | `false`         | (Optional) Maximum number of video samples in the input. If the input video exceeds this number of samples, an error is returned. `Number of samples = Duration in seconds * FPS`                                                           |

| `preprocess_video_info_function`  | `function`    | `false`         | (Optional) Async function to preprocess the input video metadata and dynamically modify the method parameters.           |

| `audio_queue_max_size`  | `int`    | `20`         | (Optional) Maximum number of audio frames in the processing queue. (A larger number will increase parallel graphics calculations and provide a slight speed improvement, but may cause a bottleneck. A value greater than 30 is not recommended.)           |



##### `file`



Allowed formats and codecs:



- MP4

  - Video codec:

    - H.264 (AVC)

    - H.265 (HVC)

  - Audio codec:

    - mp4a

    - Opus



##### `max_video_bitrate`



Fixed maximum.



```javascript

CrafyVideoJS_instance.processVideo({

  max_video_bitrate: 1_500_000 // Fixed int.

});

```



Input video bitrate percentage.



```javascript

CrafyVideoJS_instance.processVideo({

  max_video_bitrate: {

    "type": "percentage_of_original",

    "percentage": 50

  }

});

```



Fixed maximum based on closest resolution to output video resolution.



```javascript

CrafyVideoJS_instance.processVideo({

  max_video_bitrate: {

    "type": "max_by_resolution",

    "data": {

      // (Total resolution = Video width * Video height): Max bitrate

      2073600: 5_000_000, // 1080p, 5mbps

      921600: 1_000_000, // 720p, 1mbps

      307200: 300_000 // 480p, 300kbps

    }

  }

});

```



Percentage of input video bitrate based on closest resolution to output video resolution.



```javascript

CrafyVideoJS_instance.processVideo({

  max_video_bitrate: {

    "type": "percentage_of_original_by_resolution",

    "data": {

      // (Total resolution = Video width * Video height): Percentage of input video bitrate

      2073600: 50, // 1080p, 50%

      921600: 40, // 720p, 40%

      307200: 30 // 480p, 30%

    }

  }

});

```



Percentage of input video bitrate based on closest resolution to output video resolution, combined with a fixed maximum.



```javascript

CrafyVideoJS_instance.processVideo({

  max_video_bitrate: {

    "type": "percentage_and_max_of_original_by_resolution",

    "data": {

      // (Total resolution = Video width * Video height): {percentage, max}

      2073600: {

        "percentage": 50,

        "max": 5_000_000

      },

      921600: {

        "percentage": 40,

        "max": 1_000_000

      },

      307200: {

        "percentage": 30,

        "max": 300_000

      }

    }

  }

});

```



##### `max_video_resolution`



Fixed maximum.



```javascript

CrafyVideoJS_instance.processVideo({

  max_video_resolution: 1920 // 1080p

});

```



Fixed maximum based on closest number of samples to number of samples from the input video.



```javascript

CrafyVideoJS_instance.processVideo({

  max_video_resolution: {

    "type": "by_near_samplesCount",

    "data": {

      // (Number of samples = Video seconds duration * Video FPS): Max resolution

      1200: 1920, // 1080p

      30000: 1280 // 720p

    }

  }

});

```



Fixed maximum based on a maximum number of samples from the input video.



```javascript

CrafyVideoJS_instance.processVideo({

  max_video_resolution: {

    "type": "by_max_samplesCount",

    "data": {

      // (Number of samples = Video seconds duration * Video FPS): Max resolution

      1200: 1920,

      30000: 1280,

      0: 640 // 0 is used when the number of samples in the input video is greater than all the maximums set.

    }

  }

});

```



##### `preprocess_video_info_function`



If set, this function will be called after reading the input video data and will wait for your response to continue.



The function will receive the input video information as a parameter, and must respond with an object that has the same structure as the one used as options in `CrafyVideoJS.processVideo(options)`.



This feature allows fine-grained control over configuration parameters for video processing based on input video information.



Example:



```javascript

CrafyVideoJS_instance.processVideo({

  preprocess_video_info_function: async function (video_info) {

    // Process video_info (mp4box file).

    return {

      redimension_resizeQuality: "high"

    };

  }

});

```



---



## Comparison with FFmpeg WASM



[ffmpeg.wasm](https://github.com/ffmpegwasm/ffmpeg.wasm "ffmpeg.wasm")



| Feature                   | **CrafyVideoJS**                              | **FFmpeg WASM**                             |

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

| **Performance**           | Very fast (hardware-accelerated via GPU).     | Slow (WebAssembly is CPU-only).             |

| **Browser Compatibility** | Modern browsers supporting `VideoEncoder` and `VideoDecoder` (no Firefox support yet). | Works in most browsers, including Firefox. |

| **Formats/Codecs**        | Video input: MP4 (H.264/AVC), MP4 (H.265/HVC). Video output: MP4 (H.264/AVC) only.                         | Wide range of formats and codecs.           |

| **Use Case**              | Ideal for MP4 H.264-focused applications requiring efficiency. | Flexible for various video processing tasks.|



**Note:** CrafyVideoJS plans to support additional codecs and formats in future releases.



---



## Contributing



We welcome contributions to improve CrafyVideoJS! Here's how you can help:



- **Major Changes**: Fork the repository, create a branch, implement your changes, and submit a pull request.

- **Bug Reports & Feature Requests**: Open an issue with as much detail as possible, including error messages and steps to reproduce (if applicable).

- **Small Fixes**: Feel free to directly submit issues or pull requests for minor changes.



---



## Credits and thanks



- [mp4-h264-re-encode](https://github.com/vjeux/mp4-h264-re-encode)

- [mp4box.js](https://github.com/gpac/mp4box.js)

- [chatgpt](https://chatgpt.com/)

- [claude](https://claude.ai/)



---



## License



CrafyVideoJS is licensed under the MIT License. See the `LICENSE` file for more details.



---



Happy coding! 🚀



Made with 💙 by [Crafy Holding](https://chijete.com/ "Crafy Holding").