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This section contains detailed information about the elements of the H.264 for Apple Devices Encoder pane in the Inspector window. You make your H.264 settings using this pane, by either modifying an existing setting or creating a new setting in the Settings tab.

You make your H.264 for Apple Devices settings using the controls described below, either by duplicating an existing setting and modifying it or by creating a new setting in the Settings tab of the Settings window. The H.264 for Apple Devices Encoder pane contains the following items.

• Extension: This field displays the H.264 for Apple Devices file extension (.m4v) automatically after the H.264 for Apple Devices output format is chosen from the File Format pop-up menu or the (+) pop-up menu in the Settings tab of the Settings window. • Allow Job Segmenting: This checkbox allows you to turn off job segmenting. It is relevant

only if you are using Compressor with distributed processingandwith multi-pass encoding. For more information, seeJob Segmenting and Two-Pass or Multi-Pass Encoding.

• Device:Select one of the following device options from the pop-up menu:

• iPod/iPhone (VGA): This option creates video output files with a frame width of 640 pixels.

• iPod/iPhone (Anamorphic): This option creates video output files with a frame width of 640 (anamorphic) pixels.

• iPod/iPhone (QVGA): This option creates video output files with a frame width of 320 pixels.

• Apple TV SD: This option creates video output files with a frame width of 640 pixels with a higher bit rate range than the iPod/iPhone 640 (VGA) option.

• Apple TV SD (Anamorphic): This option creates video output files with a frame width of 720 (anamorphic) pixels.

• Apple TV HD: This option creates video output files with a frame width of 1280 pixels, except when the aspect ratio is set to 4:3. In that case, the video output files have frame dimensions of 960 x 720 (anamorphic) pixels for frame rates above 24 fps and 1280 x 720 (square) pixels for lower frame rates.

• Apple TV 3rd Generation: This option, intended for the third-generation Apple TV and iPad models, creates video output files with a frame width of 1080 pixels.

• iPhone (Local/WiFi): This option creates video output files with a frame width of 480 pixels.

• iPhone (Cellular): This option creates video output files with a frame width of 176 pixels.

• iPad/iPhone with Retina display: This option creates video output files with a frame width of 1280 pixels.

• Aspect Ratio: Use the Aspect Ratio pop-up menu to choose the exact pixel dimensions of the output media file. The available options depend on which device option you selected. SeeAspect Ratios for Apple Devicesfor more information.

The Aspect Ratio setting also has an Automatic button. Clicking the Automatic button causes the encoder to choose the aspect ratio that matches the source video file.

Important:The automatic mode for the Aspect Ratio setting is able to choose from a wider variety of values to better match the source video (with the values determined and displayed when this output format is applied to a source media file). For the best results, it is recommended that you use the automatic mode for the Aspect Ratio setting.

The Aspect Ratio Automatic button

Note: By default, the Frame Controls feature is set to Automatic. The Frame Controls Retiming Control will be engaged only if the source file is interlaced.

The Frame Rate setting also has an Automatic button. Clicking the Automatic button causes the encoder to choose the frame rate that matches the source video file.

The Frame Rate Automatic button

• 29.97: Used for NTSC-based video • 25: Used for PAL-based video • 24: Used for PAL-based video • 23.98: Used for NTSC-based video • 15: Used for web-based video

• Bit Rate:Use this slider to choose the bit rate to use for the output video, or enter a number in the text field. The available ranges depend on the Device setting. The setting you should choose depends on how the output is to be used. Higher bit rates produce better picture quality, but they also produce larger output files.

• Audio: Use this pop-up menu to choose from the four audio bit-rate options listed below.

• None: Use this option to exclude audio from the output media file.

• 24 Kbps: Creates an audio bitstream at 24 Kbps for the iPhone (Cellular) device option. • 128 Kbps: Creates an audio bitstream at 128 Kbps.

• 256 Kbps: Creates an audio bitstream at 256 Kbps.

• Frame Sync: Also known as thekey 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, seeJob 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.