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Architecture and Pragmatics of Server-directed Transcoding Björn Knutsson and Honghui Lu, U. Penn Jeffrey Mogul, HP WRL

Transcoding proxies ,[object Object],[object Object],[object Object],[object Object],Origin Server Transcoding Proxy

Problem with transcoding proxies JPEG, 600x800 Q=50, 48617 bytes JPEG, 200x267 Q=34, 5815 bytes JPEG, 600x800 Q=3, 5830 bytes Q=50, 5831 bytes

Server-directed transcoding (SDT) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Contributions ,[object Object],[object Object],[object Object],[object Object],[object Object]

Basic architecture ,[object Object],[object Object],Origin Server Transcoding Proxy Client Request Transcoded response Request Response + directives Fetch applet ,[object Object]

HTTP protocol extensions ,[object Object],[object Object],[object Object],[object Object],SDT-applet: http://example.com/crop.jar SDT-parms: crop-origin=140;300, crop-size=100,100

Basic image transformations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Complex image transformations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What should an applet look like? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example applet: 'crop-interp' ,[object Object],[object Object],[object Object]

Other category-specific applets ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Who is in control? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Who is in control of what ? ,[object Object],[object Object],[object Object],[object Object]

Rules for resolving conflicts ,[object Object],[object Object],[object Object],[object Object]

Proxy environment Transcoding applet response Transcoded response SDT-parms Client parameters Proxy parameters

Revisit ‘crop-interp’ ,[object Object],[object Object],Crop-interp(input image, output image, SDT_params, /* crop boxes */ client parameters, proxy parameters)

The pragmatics of an applet ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The pragmatics of an applet ,[object Object],Function applet Control applet 2 Control applet 1 ,[object Object]

Prototype proxy implementation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Experimental environment ,[object Object],[object Object],[object Object],[object Object]

Transcoding overhead ,[object Object],[object Object],[object Object],[object Object],[object Object]

Effect on end-to-end latency (ms) 211 1120 Proxy transcoding 200x276 510 9680 No proxy 600x800 768 Kbps 56 Kbps

Summary of contributions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Future work ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Related work ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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