spritesheet: Element to generate spritesheet.

spritesheet are used for thumbnail seeking in the player. It is used along with webvtt file, defined as sparial-dimension of media. https://www.w3.org/TR/media-frags/#naming-space

This plugin only generate the output buffer with rows and columns of tiles(thumbnails). It sends a signal on every tile on spritesheert. Signal has all the infomation to generate entry in the webvtt file.

Attached is the example python script to generate spritesheet and webvtt. spritesheet-demo.py

Edited by rajneeshksoni

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