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Table Of Contents
Frame Sync: Also known as the key frame interval, the Frame Sync value represents how
often a key frame is inserted in the H.264 stream. The lower the number, the more
smoothly the video can be manipulated (scrubbed) during playback (more frequent
key frames). The higher the number, the more efficient the compression (less frequent
key frames). The available range is from 2 to 10 seconds; the default is 5 seconds.
The Frame Sync setting also has an Automatic checkbox. Selecting the Automatic
checkbox causes the encoder to choose a frame sync rate that matches the source
video file.
Multi-pass: Similar to two-pass MPEG-2 encoding, multi-pass offers the best possible
quality. For faster (single-pass) encoding, turn this feature off by deselecting the
checkbox.
Note: If you are also using distributed processing, you may want to turn off job
segmenting. For more information, see Job Segmenting and Two-Pass or Multi-Pass
Encoding.
Include Dolby 5.1: Use this checkbox to add a Dolby Digital Professional 5.1 surround
sound audio track, in addition to the standard AAC audio track, to the output movie.
This feature is intended to be used when creating output files from source files that
include surround sound audio. The Dolby Digital Professional audio track is played by
Apple TV only when connected to a system with a suitable Dolby Digital decoder. The
AAC audio track plays in all other cases.
Note: Selecting the Include Dolby 5.1 checkbox creates a true Dolby Digital Professional
5.1 surround sound audio track only if your source audio includes 5.1 surround sound
audio. If your source audio includes only stereo audio, the Dolby Digital Professional
5.1 surround sound audio track has only two channels of actual audio.
Chapter and Podcast Markers for Apple Devices
Chapter markers created in Final Cut Pro are passed through (transferred) to other output
files that can be recognized by QuickTime Player, iTunes (.m4v files), and Final Cut Pro.
163Chapter 13 Creating H.264 for Apple Devices Output Files