Premiere Pro attempts to play back any sequence in real
time and at full frame rate. Premiere Pro usually achieves this
for all sections that either need no rendering or for which Premiere
Pro already has rendered preview files. However, real-time, full
frame-rate playback is not always possible for complex sections without
preview files: unrendered sections.
When you set the Program Monitor quality setting to Automatic
Quality, Premiere Pro dynamically adjusts video quality and frame
rate in order to preview the sequence in real time. During particularly
complex unrendered sections of the sequence, or when using a system
with inadequate resources, the playback quality degrades gracefully.
To play back complex sections in real time and at full frame
rate, you may have to first render preview files for those sections.
Premiere Pro marks unrendered sections of a sequence with colored
render bars. A red render bar appearing in the time ruler of a sequence
indicates an unrendered section that probably must be rendered in
order to play back in real time and at full frame rate. A yellow render
bar indicates an unrendered section that probably does not need
to be rendered in order to play back in real time and at full frame
rate. Regardless of their preview quality, sections under either
red or yellow render bars should be rendered before you export them
to tape. A green render bar indicates a section that already has
rendered preview files associated with it.
Sequences refer to preview files in much the same way as source
media. If you move or delete preview files in the Windows or Mac
file browser rather than the Project panel, you’ll be prompted to
find or skip the preview files the next time you open the project.
You can customize a sequence preset to allow
previewing of uncompressed 10-bit or uncompressed 8-bit footage.
For more information, see 