@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 @samp{;FFMETADATA} string, followed by a version number (now 1).

 
 @item

 Metadata tags are of the form @samp{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 (@samp{[}, @samp{]}) 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
 @samp{TIMEBASE=@var{num}/@var{den}}, where @var{num} and @var{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

 @samp{START=@var{num}}, @samp{END=@var{num}}, where @var{num} is a positive
 integer.

 
 @item

 Empty lines and lines starting with @samp{;} or @samp{#} are ignored.

 
 @item

 Metadata keys or values containing special characters (@samp{=}, @samp{;},
 @samp{#}, @samp{\} and a newline) must be escaped with a backslash @samp{\}.

 
 @item

 Note that whitespace in metadata (e.g. @samp{foo = bar}) is considered to be
 a part of the tag (in the example above key is @samp{foo }, value is
 @samp{ 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