Modify timing and frame rate in Compressor
In Compressor, you can modify the duration of a transcoded file by adjusting controls in the General inspector. You can modify the frame rate of a transcoded file by adjusting controls in the Video inspector.
Choose a new duration for a transcoded file
In Compressor, do one of the following:
In the batch area, click an output row to select a preset in a job. With this method, the modifications you make will be used for outputting only that job.
In the Presets pane, select a custom preset from the Custom group. (If the Presets pane is hidden, press Shift-Command-1.) With this method, the modifications you make will be saved to the custom preset for future use.
In the inspector pane, click General to open the General inspector.
If the inspector pane is not visible, click the Inspector button
in the upper-right corner of the Compressor window.In the Retiming section of the General inspector, modify the “Set duration to” property in one of the following ways:
Enter a specific percentage of the source footage in the percentage field, or choose a preset percentage from the pop-up menu (with a down arrow).
Note: Choosing a preset from this pop-up menu doesn’t change the frame rate of the output file. If you want to create a file at a frame rate other than the source’s original rate, you must change the preset in the Video inspector.
Click to select the button next to the timecode field and enter a specific duration for the outgoing file. (The percentage field above will automatically update.)
Note: This option is available only when you’re modifying a preset that’s part of a job.
Click to select “So source frames play at [frame rate] fps.”
Note: The frame rate used in this option is the value set in the “Frame rate” property in the Video inspector.
Change the frame rate for a transcoded file
Select an output row in a job in the Compressor batch area, or select a custom preset in the Presets pane.
In the Video inspector, do one of the following:
Click the “Frame rate” pop-up menu, then choose an option.
Automatic, the default value, matches the frame rate of the transcoded file to that of the source file. You can also choose any of several commonly used frame rates, including 23.976 fps, 24 fps, and so on.
Type a custom frame rate in the field to the right of the “Frame rate” pop-up menu.
Note: Some formats (such as Apple Devices presets) don’t permit custom frame rates.
Note: Frame rate conversion can have a subtle or dramatic effect depending on how big a difference there is between the original and new frame rates, and also depending on the specific nature of the footage being converted. Footage with a lot of movement yields a much more visible change than footage with little movement in the frame. Frame rate conversion may also add visible artifacts in the transcoded file; from stuttering (sometimes called “juddery”) playback, to repeated frames, ghost images, or other unnatural-looking elements. These effects can be somewhat mitigated by adjusting the “Retiming quality” property in the Quality section of the Video inspector.
Click the “Field order” pop-up menu, then choose a progressive or interlaced frame rate.
If the current preset doesn’t allow field order modification, this control remains dimmed. If you want to convert a file with an interlaced format into a progressive format, see Use deinterlacing in Compressor.
Note: The properties in the Retiming section of the General inspector are always affected by the “Frame rate” property, as well as the “Retiming quality” property in the Video inspector.
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