4.1

Chapter 4 Advanced adjustments 42
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
les using an H.264 encoder. This format encodes les for HTTP live streaming and for AAC
audio les used in audio podcasting and digital music playback. To learn more about HTTP Live
Streaming, see the HTTP Live Streaming Overview and other related documents available in the
Mac Developer library.
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 le). It’s recommended that you use the automatically assigned setting properties.
Setting summary
Displays the setting name and transcoding format, as well as an estimated output le
size. When you add a setting to a job or change the setting’s properties, this summary
automatically updates.
General properties
•
Name: Displays the name of the setting.
•
Description: Displays the description of the setting.
•
Extension: Displays the extension of the output le (.mp4 or .m4a).
•
Allow job segmenting: If you’ve set up distributed processing, select this checkbox to have
Compressor process the output le using your shared computer group. For more information,
see Transcode batches using other computers on page 101.
Note: Job segmenting is not available when outputting an MPEG-4 audio le or when the
Multi-pass checkbox is selected in the Video inspector.
•
Default location: Choose an item from the pop-up menu to set the default save location for
transcoded les.
•
Format: Use this pop-up menu to set whether the output includes video and audio, video only,
or audio only.
•
Optimize for network use: Select this checkbox to create a le that will start playing after only a
small portion of the le has been downloaded from the network.
•
Enhanced podcast: Select this checkbox to have Compressor embed podcasting information
(annotations, markers, and artwork) into the output media le. For more information about
annotations, see Add metadata on page 80. For more information about chapter markers, see
Add markers on page 82.
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