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ts-whammy

A modern typescript version of whammy. You can use it to encode images(webp) to webm video.

ts-whammy only includes the core video encoding functions of whammy, you can use it whatever modern frontend stack you prefer.

Status

Quick start

npm install ts-whammy -S

// for js
import tsWhammy from 'ts-whammy'

// for ts
// import tsWhammy from 'ts-whammy/src/libs'

// image URLs can from: canvas.toDataURL(type, encoderOptions)
const images = ['data:image/webp;base64,UklGRkZg....',
  'data:image/webp;base64,UklGRkZg....']

// create a video at 1 FPS
const blob = tsWhammy.fromImageArray(images, 1)
// create a 5 second video
const blob = tsWhammy.fromImageArrayWithOptions(images, { duration: 5 })

console.log(blob.type, blob.size)

Usage

• Upload images to video
• Convert Canvas-recorded images into a video

Compatibility

• node
• browsers (must support webp): https://caniuse.com/#feat=webp

Performance

# test data
images info length(5),
total base64 size(157.37890625 kb),
total blob size(118.029296875 kb)

# MacBook Pro I7 2.2G
# node v10.13.0, benchmark
--- testFromImageArray ---
fromImageArray x 63.06 ops/sec ±2.74% (64 runs sampled)

# chrome 79, simple loop test
--- start test total count(100) ---
...
...
end test total count(100),
time(697 ms),
avg time(6.97 ms),
ops/sec (143.47202295552367),
webm size (118.1572265625 kb)

Docs

index

fromImageArray(images: string[], fps: number, outputAsArray?: boolean): Blob | Uint8Array

• images: An array of image base64 strings, image type must be 'image/webp', see more: https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/toDataURL. images must have same width and height, must not have Alpha Channel
• fps: frames per second number, FPS number can't be 0. (if you set FPS to equal 0, FPS will be reset to default of 1).
• outputAsArray: return Uint8Array output, the default output is Blob. In node environments, the output always be Uint8Array.

fromImageArrayWithOptions(images: string[], options: IFromImageArrayOptions = {}): Blob | Uint8Array

• images: Same as `fromImageArray's images
• options:
  • fps: Same as fromImageArray's fps
  • duration set output video's duration in seconds. This will adjust the video's FPS to make sure the video has the exact duration.
  • outputAsArray: Same as fromImageArray's outputAsArray

async fixImageDataList(images: string[], options?: ImageSrcToWebpDataUrlOptions): Promise<string[]>

This function can make common image(jpg,png,webp...) url or base64 to be an valid webp image. Then can send it to fromImageArrayWithOptions make an video. See this demo: Convert Canvas-recorded images into a video

• images: An array of image url or base64.
• options
  • width: image width for all, use it to fix image width
  • height: image height for all, use it to fix image height
  • backgroundColor: image background color, use it to fix image alpha channel

Contribution

Feel free to contribute this project.

TODO

• update the demo, support [✅ ]record canvas/[TODO]HTML, ✅ upload images to video...
• [✅]upgrade docs to astro
• [✅]support build out the esm lib
• update tests case, up test codecov