10/22/2008

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Contents

Attendees

Fujimori - apologies.

Reuben, Dominic, Ian, John, Nick, Lloyd.

Lloyd

  • ODF / Zip
  • Has manifest
  • Question - should a container format be developed for SMIL files?
    • how do you figure out what you have if you have to go to the end of the file, and seek backwards?
  • Zip isn't something we'd want to stream, but if we were going to send the whole file, that might be applicable
    • And if we were going to stream, we'd send uncompressed
  • PKWare have continued to update the Zip spec through September '07, seperate branch from winzip

Nick

  • Zip a bad idea for online delivery; you don't know what's in there until you have it all
    • Or you have to scan the headers
  • OOXML
    • Refers to OPC, open packaging convention
    • You get a manifest of the included files
    • Make relationships between them
    • Manifest is at the beginning
    • Doesn't give you offsets into it
    • Zips don't respect file order
  • Web service / DAISY Online
    • Provides manifest, then client requests individual files
    • Manifest at the beginning, then send each file
  • Do we need compression?
    • We could define format with manifest at the beginning, and then everything else in one enormous file with offsets matching the manifest
  • Do containers really need to be provided for streaming?

Discussion

  • Lloyd
    • Would the tar format meet the criteria?
      • Uncompressed
      • Serial, so the manifest could always be at the start
  • Dominic
    • Compression is hard for hardware players
    • Maybe we could use a file system. There are many uncompressed containers
    • Compression is less necessary for full audio books, more so for text
  • Lloyd
    • CD file system much better than Flash file system (the latter uses FAT 16, can't have many files in root directory)
    • Adobe format based on EPub
  • John
    • OCF supports either zip or a simple filesystem container

Next meeting

We'll be in daylight savings next meeting

  • Dominic - File system alternatives
  • Nick - Adobe container format
  • Lloyd -
  • John - OCF
  • Reuben - OCF
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