Flowchart

• Video uploading

• Video preprocessing - Chain of responsibilities

  • Content and duplication check

  • Thumbnails

  • Watermark

  • Transcoding

• Video search

Video uploading

• Video is uploaded to storage directly, not passing web server to save bandwidth.

Upload video

Video preprocessing - Chain of responsibilities

Video processing

Content and duplication check

• Make sure videos have good quality and not malformed.

Thumbnails

• Thumbnail: Can be manually uploaded by the user or automatically generated by the system.

Video processing

Watermark

• An image overlay on top of your video contains identifying information about your video.

Transcoding

• Video transcoding: Videos are converted to support different container/codec. Video transcoding is to

  • Raw video consumes large amount of storage space.

  • Many browsers and devices only support certain form of encoding.

• Video could be encoded into different resolution frames. In terms of which frames to play, it could be decided based on the network speed.

Video search

• when videos are uploaded, metadata (user, video title, etc) will be used to generate the inverse index.

• When client app plays video, it could play the video on the fly using protocols such as MPEG-DASH.