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oggz-chop(1)           DragonFly General Commands Manual          oggz-chop(1)


NAME

       oggz-chop -- Extract the part of an Ogg file between given start and/or
       end times.


SYNOPSIS

       oggz-chop [-o filename  | --output filename ]  [-s start_time  |
       --start start_time ]  [-e end_time  | --end end_time ]  [-k  | --no-
       skeleton ] filename

       oggz-chop [-h  | --help ]  [-v  | --version ]

Description
       oggz-chop chops a section of an Ogg file.  It correctly interprets the
       granulepos timestamps of Ogg CELT, CMML, Dirac, FLAC, Kate, PCM, Speex,
       Theora and Vorbis bitstreams.  Run oggz-known-codecs(1) for a full list
       of codecs known by the installed version of oggz.

       The output file contains copies of the headers of the input file, and
       all the codec data required to correctly decode the content between the
       start and end times specified on the commandline. For codecs with data
       dependencies like video keyframes, the keyframe prior to the starting
       time will be included in the output.

       Note that oggz-chop operates by copying pages of Ogg data; it does not
       strip partial packets from the first or last data page included in the
       output. It does however ensure to set the end of stream flag on the
       last page of each logical bitstream.

       Skeleton handling: By default, the output will contain a Skeleton track
       specifying the start of the chop as presentation time.

Options
       oggz-chop accepts the following options:

   Output options
       -o filename, --output filename
                 Write output to the specified filename instead of printing it
                 to standard output.

       -s start_time, --start start_time
                 Specify the start time of the chopped section to output.

       -e end_time, --end end_time
                 Specify the end time of the chopped section to output.

       -k , --no-skeleton
                 Do NOT include a Skeleton bitstream in the output.

       -h, --help
                 Display usage information and exit.

       -v, --version
                 Output version information and exit.


EXAMPLES

       Extract the first minute of file.ogx:

              oggz chop -e 1:00 file.ogx

       Extract from the second to the fifth minute of file.ogx:

              oggz chop -s 2:00 -e 5:00 -o output.ogx file.ogx

       Extract, specifying SMPTE-25 frame offsets:

              oggz chop -s smpte-25:00:02:03::12 -e smpte-25:00:05:02::04 -o
              output.ogv file.ogv

Server configuration
       The following configuration for Apache httpd will enable oggz-chop. As
       with most Apache directives, this may of course be restricted to
       particular Directories or Locations:

       ScriptAlias /oggz-chop /usr/bin/oggz-chop

       Action application/ogg /oggz-chop

   HTTP/1.1 Cacheability
       oggz-chop generates Last-Modified HTTP headers, and responds correctly
       to If-Modified-Since conditional GET requests.


AUTHOR

       Conrad Parker        February 25, 2008;


COPYRIGHT

       Copyright (C) 2008 Annodex Association


SEE ALSO

       oggz-validate(1), oggz-merge(1), oggz-dump(1), hogg(1)

                                                                  oggz-chop(1)

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