Author: michael Date: Tue Feb 5 00:05:01 2008 New Revision: 582 Log: Make nut capable to handle attachments. Alternative suggestions are welcome Modified: docs/nut.txt Modified: docs/nut.txt ============================================================================== --- docs/nut.txt (original) +++ docs/nut.txt Tue Feb 5 00:05:01 2008 @@ -923,8 +923,8 @@ stream_header (id=1) ... stream_header (id=n) -Headers may be repeated, but if they are, then they MUST all be repeated -together and repeated headers MUST be identical. +Headers may be repeated, but if they are, then all mandatory headers MUST be +repeated and repeated headers MUST be identical. Each set of repeated headers not at the beginning or end of the file SHOULD be stored at the earliest possible position after 2^x where x is an integer. @@ -934,12 +934,22 @@ So the headers may be repeated at 4102 i Note: This allows an implementation reading the file to locate backup headers in O(log filesize) time as opposed to O(filesize). -Headers MUST be placed at least at the start of the file and immediately before +All headers MUST be placed at least at the start of the file. +Mandatory headers MUST additionally be placed immediately before the index or at the end of the file if there is no index. -Headers MUST be repeated at least twice (so they exist three times in a file). +Mandatory headers MUST be repeated at least twice (so they exist three times +in a file). There MUST be a syncpoint immediately before the first frame after any headers. +The main header is mandatory, so are all stream headers except thouse for +redundant and enhanchement streams. So for example if the file contains 2 +independant video streams encoding the same content at 2 different bitrates. +Then only one is mandatory, which that is, is at the discretion of the muxer. +Enhancement streams like font attachments are also non mandatory. +The muxer SHOULD repeat non mandatory stream headers like mandatory ones if +the overhead is not excessive. + Index: ------