About the H.264 for Apple Devices Encoder Pane

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.

Figure. H.264 for Apple Devices Encoder pane of the Inspector window.

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 processing and with multi-pass encoding. (The distributed processing feature is limited to computers that have Final Cut Studio installed.) For more information, see Job Segmenting and Two-Pass or Multi-Pass Encoding.
  • 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.
    Figure. Bit Rate slider.
  • 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.

    Figure. Frame Sync slider and Automatic checkbox.
  • 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.

    Figure. Multi-pass checkbox and Include Dolby 5.1 checkbox.