User Manual

Mixing Frame Rates and Field Motion Types
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them into sequences in the same project type. When existing material in a sequence is transcoded
across edit rates, your Avid editing application automatically removes motion adapters and
adjusts Timewarp effects.
Your Avid editing application creates new clips whose duration and start and end timecode
matches the original clips as closely as possible and which are as compatible as possible with the
project’s edit rate. However, due to roundoff error, you might see minor variations in clip
duration or in frame offset information that could result in such issues as minor audio/video
differences (for example, slips of 1 or 2 frames).
In some cases, the last frame of a transcoded clip might be offline. Avid recommends using
non-zero handles when you transcode sequences with mixed-rate clips to minimize the chance of
seeing offline frames.
You should check transcoded sequences carefully and adjust any variations from the original
sequences that are not acceptable to you, for example, by trimming.
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You cannot transcode clips across edit rates using the Transcode Server in Interplay.
Grouped Clips and Mixed Rate Material
Be aware of the following if you group clips or work with grouped clips:
• You cannot group clips that have different frame rates
• You cannot load a grouped clip whose frame rate does not match the project's frame rate. If
you load this type of clip into the Source monitor or drag it into the Timeline, an error
message appears.
• You can create a sequence that includes both grouped clips that have the same frame rate as
the project and single clips of other frame rates.
Working with Markers on Mixed Rate Material
You should be aware of the following when you work with markers on mixed rate material:
• Depending on the frame rates of your clips and your project, you might not be able to add a
marker at the exact location of the position indicator. For example, if you add a marker to a
30 fps clip in a 720p/59.94 project, you can move the position indicator to a location that
does not match a frame in the clip. Your Avid editing application adds the marker at the
closest valid location in the clip.
• Depending on the frame rates of your clips and your project, you might not be able to access
all of the markers on a clip in the Source monitor. For example, if you load a 720p/59.94 clip
in a 30 fps project, the position bar in the Source monitor cannot display every marker
position. You can use the Markers Window to access all the markers. For more information,
see “Using the Markers Window” on page 531.