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Doubt regarding "Replicated Data Length" of ASF RRS feed

  • Question

  • Hi all,

          As per the ASF specification document it is mentioned for "Replicated Data Length",

    If the value of this field is set to 1, the payload should be interpreted as a compressed payload, as described in section 5.2.3.2. Otherwise, valid values are 0 or values greater than or equal to 8.

    My question/doubt is that is it possible to have a WMV file with this value being 0.
    In case its zero, the application won't have a timestamp for that particular payload and its impossible to have AV sync.

    Regards
    Pranjal

    Wednesday, November 18, 2009 2:00 PM

Answers

  • You are correct to expect that most ASF files would have Replicated Data Length != 0.  However, it is possible to generate such a file.  The content author would have to determine if they can deal with the limitations of not having any replicated data for a given payload.  Perhaps a WMV file with only an uncompressed video stream could generate timestamps from the frame rate, and it saves a few bytes per payload by not having replicated data. 
    • Marked as answer by pranjalc Friday, November 27, 2009 3:05 AM
    Friday, November 20, 2009 11:49 PM

All replies

  • You are correct to expect that most ASF files would have Replicated Data Length != 0.  However, it is possible to generate such a file.  The content author would have to determine if they can deal with the limitations of not having any replicated data for a given payload.  Perhaps a WMV file with only an uncompressed video stream could generate timestamps from the frame rate, and it saves a few bytes per payload by not having replicated data. 
    • Marked as answer by pranjalc Friday, November 27, 2009 3:05 AM
    Friday, November 20, 2009 11:49 PM
  • Thanks Matt. Thank you for the information.

    Regards
    Pranjal
    Friday, November 27, 2009 3:05 AM