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High Definition in Avid Liquid
Timeline and Master Viewer
Basically, the same applies to the Timeline and Master Viewer as to the other two viewers. It is possible to
combine clips with different aspect ratios and resolutions in one Sequence. However, you will probably
prefer to try adapting the non-conforming clips to the Timeline or Sequence format selected, because a
mixed master is undesirable.
The Master Viewer also adopts the setting for the Timeline: If the Timeline is set to an HDV format of
1280 x 720, 16:9, square pixels, the Master Viewer has the same aspect ratio and clips with a different for-
mat are handled as described in the section above (i.e. according to their Scaling).
True and Pseudo 16:9
Many camcorders (including semiprofessional ones) have a 16:9 switch. Although this switch produces
the desired aspect ratio, 72 lines at the top and 72 lines at the bottom are displayed as black bars. The loss
of these lines results in a poorer image quality when the image is scaled to the greater width.
This type of 16:9 should not be confused with HD; it is merely modified NTSC or PAL.
Different Timecode Systems
The timecode systems differ with regard to the frame rate (fps) and, to a certain extent, with regard to the
drop frame/non drop frame problem (also see “Timecode Systems” on page 84).
Clip Viewer and Source Viewer
The Clip Viewer and Source Viewer always load and play clips and objects, both audio and video, using
their original TC system. This means you can always work frame by frame and insert objects on the
Timeline from mark-in to mark-in or at the Playline position.
If several clips with different TC systems are loaded in the Clip Viewer at one time, the TC system for the
current Sequence applies (Timeline Properties).
Converting TC Systems (Media Import Option)
Normally, the TC systems of objects are automatically detected when these objects are imported or cap-
tured. This is controlled by an option in the Media Import dialog box. If you wish to impose a certain TC
system on a clip, re-import it in the desired TC system with the automatic feature disabled (see “Default
TC System” on page 164). This generates a copy of the clip at the selected frame rate. However, it may
cause the associated audio to become asynchronous, so you should only import the video clip.