Autodesk 64006-051108-9001 User Guide - Page 189

Spatial Quality and Temporal Quality Sliders, Frame Rate, On the other hand

Page 189 highlights

Encode Tab 181 Spatial Quality and Temporal Quality Sliders Depending on which codec you select, there may be one or two sliders available, which vary in function. For example, if you select the QuickTime Photo-JPEG codec, a Spatial slider appears. If you select the Apple Animation codec, both a Spatial and a Temporal slider will appear. Only sliders appropriate to the selected codec are displayed. Note: Quality sliders may not be available if you are using data rate control. The Spatial and Temporal sliders require some explanation. In the standard QuickTime compression dialog, the Quality slider is really the Spatial slider. The Temporal slider is available by pressing Control+option and holding the cursor over the Quality slider. In Cleaner, both sliders appear in the Encode tab. The higher the setting of the Spatial slider, the higher the quality of the keyframes. But because movies have a fixed bandwidth, these higher-quality keyframes are achieved by lowering the quality of the delta frames. For some codecs, the Temporal slider controls the quality of the temporal encoding. Higher values produce better-looking delta frames and produce higher bitrates. Many people set both sliders to 100%, but this is usually not the best setting. The only time you should alter these sliders is if the keyframes look significantly better or worse than the delta frames. On the other hand, some codecs completely ignore these two sliders. Experiment to see which slider works best for your source files. Frame Rate Frame rate is the number of frames per second of the final, encoded movie. Choosing an appropriate frame rate for your movie has a dramatic effect on video quality. Higher frame rates at a given data rate produce smoother motion with lower image quality. Lower frame rates produce sharper images with jerkier motion. Finding the right trade-off depends on your material, data rate, and personal preferences. Also, higher frame rate material requires faster CPUs to play properly. For the best results, experiment to determine the optimal settings for your movie.

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Encode Tab
181
Spatial Quality and Temporal Quality Sliders
Depending on which codec you select, there may be one or two sliders available, which vary in
function. For example, if you select the QuickTime Photo-JPEG codec, a Spatial slider appears.
If you select the Apple Animation codec, both a Spatial and a Temporal slider will appear. Only
sliders appropriate to the selected codec are displayed.
Note:
Quality sliders may not be available if you are using data rate control.
The Spatial and Temporal sliders require some explanation. In the standard QuickTime
compression dialog, the Quality slider is really the Spatial slider. The Temporal slider is
available by pressing Control+option and holding the cursor over the Quality slider. In
Cleaner, both sliders appear in the Encode tab.
The higher the setting of the Spatial slider, the higher the quality of the keyframes. But because
movies have a fixed bandwidth, these higher-quality keyframes are achieved by lowering the
quality of the delta frames.
For some codecs, the Temporal slider controls the quality of the temporal encoding. Higher
values produce better-looking delta frames and produce higher bitrates.
Many people set both sliders to 100%, but this is usually not the best setting. The only time you
should alter these sliders is if the keyframes look significantly better or worse than the delta
frames.
On the other hand, some codecs completely ignore these two sliders. Experiment to see which
slider works best for your source files.
Frame Rate
Frame rate is the number of frames per second of the final, encoded movie.
Choosing an appropriate frame rate for your movie has a dramatic effect on video quality.
Higher frame rates at a given data rate produce smoother motion with lower image quality.
Lower frame rates produce sharper images with jerkier motion. Finding the right trade-off
depends on your material, data rate, and personal preferences. Also, higher frame rate material
requires faster CPUs to play properly.
For the best results, experiment to determine the optimal settings for your movie.