4.2

A marker flags a specific timing location in a
source file. You can append a marker with
editing notes or other descriptive information.
Additionally, when you output the source file to
an H.264, MPEG-2, or MPEG-4 video format,
each marker forces the creation of an .
Added I-frames improve compression quality,
but can increase overall file size. Compressor
can create the following types of markers:
Chapter markers: Generate named index
points and thumbnail images for DVDs,
QuickTime movies, or video podcasts. You
can also assign a URL to a chapter marker
to have that URL appear during playback
of a podcast. Chapter markers are also
markers
I-frame