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You can mix clips with different frame rates, frame
aspect ratios, and frame sizes in the same sequence. For example,
if you drop an HD clip into a sequence in an SD project, the clip
will be letter-boxed and scaled to the SD frame size automatically.
Similarly, if you drop an SD clip into a sequence in an HD project,
the clip will be pillar-boxed automatically.
A render bar will appear above any clip in a Timeline panel with
attributes not matching the sequence settings. The render bar indicates
that those clips will have to be rendered before final output. However,
it doesn't necessarily indicate these clips can't be previewed in
real-time. If a yellow render bar appears above the clip, Premiere
Pro can probably play it back in real time without rendering. If, however,
a red render bar appears above the clip, Premiere Pro probably can
not play it back in real time without rendering.
A clip with a frame rate different from the frame rate of the
sequence will play back from a sequence at the frame rate of the
sequence.
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