extract clip using gst-launch

[Nathan Gray-4]

I would like to extract a clip from a longer video.

For instance, if I have a 60 minute video called complete.ogg,
consisting of theora and vorbis in an ogg wrapper, and I want to
extract a 3 minute clip called clip.ogg starting at second 86.

It is simple enough to re-encode the whole file:

  gst-launch \
    filesrc location=complete.ogg \
      ! decodebin name=decode \
    decode. \
      ! queue \
      ! ffmpegcolorspace \
      ! theoraenc \
      ! oggmux name=mux \
    mux. \
      ! filesink location=clip.ogg \
    decode. \
      ! queue \
      ! audioconvert \
      ! vorbisenc \
      ! queue \
      ! mux.

It appears that gnonlin is the plugin I need to use (gnlsource
and gnlcomposition), but I have not been able to find any examples
of how it is used under gst-launch.

Please add to the above example the phrases I need to use in
order to extract a clip from the middle of the longer video.

Also, is it possible to losslessly extract the clip (since it is
already theora and vorbis, can I extract the segment I want
without decoding, and then re-wrap in an ogg container without
re-encoding)?

-kolibrie


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