Mpeg-4 – Apple Compressor (4.1.2) User Manual
Page 41
Chapter 4
Advanced adjustments
41
Quality
The following properties determine how the video will be resized, retimed, and otherwise
adjusted when transcoded.
•
Resize filter: This pop-up menu sets the resizing method. There are three options:
•
Fast (Nearest Pixel): Provides the fastest processing time.
•
Better (Linear Filter): Provides a medium trade-off between processing time and output quality.
•
Best (Statistical Prediction): Provides the highest output quality, but takes longer.
•
Retiming Quality: This pop-up menu sets the retiming method. There are four options:
•
Fast (Nearest Frame): Uses a copy of the nearest available frame to fill the new
in-between frames.
•
Better (Motion Adaptive): Uses deinterlacing on areas of the source file that contain
movement to produce good-quality output.
•
Best (Motion Compensated): Uses deinterlacing on areas of the source file that contain
movement to produce high-quality output.
•
Reverse Telecine: Removes the extra fields added during the telecine process to convert the
film’s 24 fps to NTSC’s 29.97 fps. Choosing this item disables all the other Quality controls. For
more information, see
on page 72.
•
Adaptive details: Select this checkbox to use advanced image analysis to distinguish between
noise and edge areas during output.
•
Anti-aliasing level: Sets the softness level in the output image. Double-click the value and then
manually enter a new value or drag the slider to the right to increase softness. This property
improves the quality of conversions when you’re scaling media up. For example, when
transcoding SD video to HD, anti-aliasing smooths jagged edges that might appear in the image.
•
Details level: Sets the amount of detail in the output image. Double-click the value and then
manually enter a new value or drag the slider to set the value. This sharpening control lets you
add detail back to an image being enlarged. Unlike other sharpening operations, the “Details
level” property distinguishes between noise and feature details, and generally doesn’t increase
unwanted grain. Increasing this value may introduce jagged edges, however, which can be
eliminated by increasing the “Anti-aliasing level” slider.
Video effects
For a list of available video effects and instructions on how to add a video effect to a setting, see
on page 74.
MPEG-4
The built-in settings included in the Prepare for HTTP Live Streaming destination and the
built-in AAC setting (for audio output) use the MPEG-4 transcoding format, which encodes
files using an H.264 encoder. This format encodes files for HTTP live streaming and for AAC
audio files used in audio podcasting and digital music playback. To learn more about HTTP Live
Streaming,
elated documents available in the
.
You can also create custom settings that use the MPEG-4 transcoding format.
The properties of built-in and custom settings that use the MPEG-4 transcoding format are listed
below. The list includes properties in the General, Video, and Audio inspectors.
Important:
When you add a setting (or a destination that includes settings) to a job, Compressor
analyzes the source media and then automatically assigns the most appropriate setting
properties (based on the setting’s transcoding format and the characteristics of your source
media file). It’s recommended that you use the automatically assigned setting properties.
67% resize factor