H.264 for Apple Devices
The built-in Apple Devices settings use the H.264 for Apple Devices transcoding format. You can also create custom settings that use the H.264 for Apple Devices transcoding format.
The properties of built-in and custom settings that use this transcoding format are located in the General, Video, and Audio inspectors. These properties are described below.
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.
Displays the setting name and transcoding format, as well as an estimated output file size. When you add a setting to a job or change the setting’s properties, this summary automatically updates.
Name: Displays the name of the setting.
Description: Displays the description of the setting.
Extension: Displays the extension of the output file (.m4v).
Allow job segmenting: If you’ve set up distributed processing, select this checkbox to have Compressor process the output file using your shared computer group. For more information, see Transcode batches with multiple computers.
Default location: Choose an item from the pop-up menu to set the default save location for transcoded files.
Format: Use this pop-up menu to set whether the output includes video and audio, or video only.
Optimize for network use: Select this checkbox to create a file that will start playing after only a small portion of the file has been downloaded from the network.
This section contains one property:
Set duration to: Sets the processing algorithm used to adjust the frame rate during transcoding. Select one of the following options:
[Percentage] of source: Modifies the output clip’s speed by a percentage of the source clip’s speed. Enter a value in the percentage field or choose a preset value from the adjacent pop-up menu (with a downward arrow).
[Total duration]: Sets the duration of the clip. Enter a timecode duration in the field or click the arrows to increase or decrease the time.
So source frames play at [frame rate] fps: Nondestructively changes the playback speed of the clip, without discarding frames or creating new frames. This setting has no effect unless the “Frame rate” value in the Video inspector is different than the source file’s frame rate. For example, if you add a 10-second source file with a frame rate of 24 fps to Compressor, set the “Frame rate” property in the Video inspector to 25 fps, then select “So source frames play at 25 fps” in the General inspector, the duration of the transcoded clip (at 25 fps) is 9 seconds and 15 frames.
For more information, see Retime video and audio.
Pixel aspect ratio: For settings that use the H.264 format, the pixel aspect ratio is set to Square.
Frame rate: Use this pop-up menu to set the playback rate (the number of images displayed per second) for the output file. For more information, see Frame rate options overview.
Field order: For settings that use the H.264 format, the field order is set to Progressive (complete frames are scanned).
Multi-pass: Select this checkbox to turn on multi-pass encoding that uses additional analysis of video frames to produce a high-quality output file. For faster (single-pass) transcoding, turn this feature off by deselecting the checkbox.
Bit rate: Select the Automatic checkbox to have Compressor calculate the appropriate bit rate for the output file, based on the frame size of the source file and device compatibility. If the checkbox is not selected, you can set the bit rate by dragging the slider or entering a value in the text field.
Frame sync: Select the Automatic checkbox to have Compressor calculate the key frame interval rate.
Note: When Frame sync is turned on, the value in the seconds field is zero (.0). However, the actual value is determined during the encoding process.
If the checkbox is not selected, you can drag the slider or enter a value in the text field to set the key frame interval (number of frames) at which you want key frames created in your output file.
Encode for: Select a button to have Compressor transcode the output file at either the best quality (so that the file will play back on newer devices) or at a lesser quality (so that as many devices as possible will play the file).
Compatible with: This list shows devices that will play the transcoded file (compatible device types are marked with a green circle that contains a checkmark ). When you change the setting’s properties (frame size, frame rate, and so on), the compatibility list automatically updates.
Cropping and padding
Customize the final cropping, sizing, and aspect ratio using the Cropping & Padding properties. Cropping removes video content from an image. Padding scales the image to a smaller size while retaining the output image’s frame size. For more information about these properties, see Modify frame size overview.
Cropping: Use this pop-up menu to set the dimension of the output image. The custom option allows you to enter your own image dimensions in the fields; other options use predetermined sizes. The Letterbox Area of Source menu item detects image edges and automatically enters crop values to match them. This is useful if you want to crop out the letterbox area (the black bars above and below a widescreen image) of a source media file.
Padding: Use this pop-up menu to set the scaling of the output image while retaining the output image’s frame size. The custom option allows you to enter your own scaling dimensions in the fields; other options use predetermined dimensions.
The following properties provide instructions for image analysis, including frame resizing, clip retiming, and deinterlacing.
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 About reverse telecine.
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.
For a list of available video effects and instructions on how to add a video effect to a setting, see Add and remove effects.
Channel layout: Use the pop-up menu to set the audio channel layout.
Sample rate: Use this pop-up menu to set the number of times per second that music waveforms (samples) are captured digitally. The higher the sample rate, the higher the audio quality and the larger the file size.
Bit rate: Use the pop-up menu to set the bit rate to use for the output audio.
Include Dolby 5.1 Audio Track: Select the checkbox to add surround sound as a Dolby Digital audio track for playback on Apple TV.
For a list of available audio effects and instructions on how to add an audio effect to a setting, see Add and remove effects.