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QuickTime/MPEG4 Hint Tracks. IETF November 1999 David Singer Mpeg4 File Format AHG Chair Apple Computer, USA [email protected] Overview. File has logical time-sequenced tracks Media Tracks contain video, audio etc. Hint tracks contain packetization hints

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quicktime mpeg4 hint tracks

QuickTime/MPEG4 Hint Tracks

IETF November 1999

David Singer

Mpeg4 File Format AHG Chair

Apple Computer, USA

[email protected]

overview
Overview
  • File has logical time-sequenced tracks
  • Media Tracks contain video, audio etc.
  • Hint tracks contain packetization hints
  • File may also contain decl. Info (e.g. SDP for DESCRIBE)
  • Darwin open-source streaming server (RTSP/RTP from QuickTime)
hint tracks
Hint tracks
  • Protocol-specific
  • Authoring tools are media-aware, protocol-unaware
  • Media typically included by reference
  • RTP Hint track packet builder:
    • RTP header info
    • Immediate data (payload header)
    • Media pointer (payload data) into media track