4.1.2

Chapter 4 Advanced adjustments 39
Video properties
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Frame size: Use the pop-up menu to set the frame size (resolution) for the output le.
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Pixel aspect ratio: Use the pop-up menu to set the pixel aspect ratio (the ratio between the
image frame width and height). You can also modify the aspect ratio of the output le using
cropping and padding properties. For more information, see Modify frame size overview on
page 67.
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Frame rate: Use this pop-up menu to set the playback rate (the number of images displayed
per second) for the output le. For more information, see Frame rate options overview on
page 69.
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Field order: Use the pop-up menu to set the output scanning method (either the eld
dominance or a conversion to progressive scanning). There are four options:
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Same as Source: Maintains the same scanning method used by the source media le.
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Progressive: Scans complete frames (not frames divided into interlaced elds).
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Top First: Scans interlaced elds, giving dominance (eld order) to the top eld, also known
as eld two, the upper eld, or the odd eld.
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Bottom First: Scans interlaced elds, giving dominance (eld order) to the bottom eld, also
known as eld one, the lower eld, or the even eld.
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Anamorphic: Set the aspect ratio using this pop-up menu. Choose Automatic to have
Compressor scale the image based on the frame size, or choose 16:9 or 4:3 to set anamorphic
scaling to a standard aspect ratio.
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Encoding mode: Choose an option from the pop-up menu to set how Compressor encodes the
output le: either faster and lower quality, or slower and better quality. Options include:
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Single Pass CBR: This is the fastest MPEG-2 encoding mode. It provides good quality,
especially at bit rates between 5 and 9 Mbps.
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Single Pass VBR: This mode aims to maintain constant quality (at the expense of constant bit
rate) for the transcoded video le. For most standard-denition (SD) media les at bit rates
of 3.5 Mbps and above, this mode provides good to excellent quality and transcodes quickly.
•
Single Pass VBR (Best): This mode provides the best possible quality output for SD video at bit
rates of 3 to 3.5 Mbps and above.
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Two Pass VBR: This mode uses two passes—one pass to analyze the entire source video
stream, and a second pass to compress the le. This mode takes longer and provides a
better-quality le than the one-pass modes, and is recommended for source media les with
a substantial dierence between the most and the least complex scenes.
•
Two Pass VBR (Best): This mode provides the best possible quality output, and outstanding
quality at bit rates of 3 to 3.5 Mbps and above for HD and SD video.
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Motion estimation: This pop-up menu sets the amount of motion processing that will be
performed on the le. There are three options:
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Good: The fastest processing setting. Use this setting when there is relatively low motion
between frames. In general, use Good with the one-pass encoding modes.
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Better: Provides very good results even in the presence of complex interlaced motion. In
general, use Better with Single Pass VBR (Best) and Two Pass VBR (Best).
•
Best: The slowest processing setting. Use for the most complex motion and for interlaced
source les. In general, use the Best mode to maximize quality when using Single Pass VBR
(Best) or Two Pass VBR (Best).
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