- Be sure to set a filename to be produced. The filename extension controls what format file is produced.
- Windows: The Preview Movie is produced by OpenGL, but it may be routed to Windows's software renderer, which can limit the maximum allowable output resolution.
- You must select a codec and compression options, Quicktime does not have a default.
- Be sure to select the correct frame rate in Quicktime to match your shot.
- Different codecs have different quirks and may need different settings. Cineform codecs may require the resolution to be a multiple of 16, for example.
- The H.264 codec requires that the "Key frame every N frames" checkbox be OFF, and probably you should either turn off the "Limit data rate to..." checkbox, or select a rate much higher than the default 90 Kb/sec.
- There's no Quicktime output from 64-bit Windows. On macOS, only a predefined set of codecs can be used for output.
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