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authorTim Redfern <tim@eclectronics.org>2014-02-17 13:36:38 +0000
committerTim Redfern <tim@eclectronics.org>2014-02-17 13:36:38 +0000
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parentae5e8541f6e06e64c28719467cdf366ac57aff31 (diff)
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-@chapter Metadata
-@c man begin METADATA
-
-FFmpeg is able to dump metadata from media files into a simple UTF-8-encoded
-INI-like text file and then load it back using the metadata muxer/demuxer.
-
-The file format is as follows:
-@enumerate
-
-@item
-A file consists of a header and a number of metadata tags divided into sections,
-each on its own line.
-
-@item
-The header is a ';FFMETADATA' string, followed by a version number (now 1).
-
-@item
-Metadata tags are of the form 'key=value'
-
-@item
-Immediately after header follows global metadata
-
-@item
-After global metadata there may be sections with per-stream/per-chapter
-metadata.
-
-@item
-A section starts with the section name in uppercase (i.e. STREAM or CHAPTER) in
-brackets ('[', ']') and ends with next section or end of file.
-
-@item
-At the beginning of a chapter section there may be an optional timebase to be
-used for start/end values. It must be in form 'TIMEBASE=num/den', where num and
-den are integers. If the timebase is missing then start/end times are assumed to
-be in milliseconds.
-Next a chapter section must contain chapter start and end times in form
-'START=num', 'END=num', where num is a positive integer.
-
-@item
-Empty lines and lines starting with ';' or '#' are ignored.
-
-@item
-Metadata keys or values containing special characters ('=', ';', '#', '\' and a
-newline) must be escaped with a backslash '\'.
-
-@item
-Note that whitespace in metadata (e.g. foo = bar) is considered to be a part of
-the tag (in the example above key is 'foo ', value is ' bar').
-@end enumerate
-
-A ffmetadata file might look like this:
-@example
-;FFMETADATA1
-title=bike\\shed
-;this is a comment
-artist=FFmpeg troll team
-
-[CHAPTER]
-TIMEBASE=1/1000
-START=0
-#chapter ends at 0:01:00
-END=60000
-title=chapter \#1
-[STREAM]
-title=multi\
-line
-@end example
-
-By using the ffmetadata muxer and demuxer it is possible to extract
-metadata from an input file to an ffmetadata file, and then transcode
-the file into an output file with the edited ffmetadata file.
-
-Extracting an ffmetadata file with @file{ffmpeg} goes as follows:
-@example
-ffmpeg -i INPUT -f ffmetadata FFMETADATAFILE
-@end example
-
-Reinserting edited metadata information from the FFMETADATAFILE file can
-be done as:
-@example
-ffmpeg -i INPUT -i FFMETADATAFILE -map_metadata 1 -codec copy OUTPUT
-@end example
-
-@c man end METADATA