Adobe Photoshop CS6 User Manual page 523

its file size. If you are using the same codec to capture and export, and you've rendered previews of a sequence, you can save rendering time by
matching the export quality setting with your original capture quality setting. Increasing quality above the original capture quality does not increase
quality, but may result in longer rendering times.
Note: Compressor options are not available for the Component Video codec.
QuickTime movie size settings
The following settings are available in the Export Size Settings dialog box:
Dimensions Specifies the frame size for your exported movie. If you want to specify a frame size not included in the Dimensions menu, choose
Custom and enter values for Width and Height.
Preserve Aspect Ratio Using
the clean aperture, adding black bars to the top and bottom or sides as necessary. Crop centers, scales, and trims to the clean aperture. Fit Within
Dimensions adjusts to the destination size by fitting to the longest side, scaling if necessary.
Deinterlace Source Video Deinterlaces the two fields in each interlaced video frame.
Optimizing images
Image stacks (Photoshop Extended)
Interpret video footage (PhotoshopExtended)
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Specifies an option if the movie is scaled to a new frame size. Letterbox scales the source proportionally to fit into