You can preview what your transcoded files will look like before you process a job. The preview area of the Compressor window has a number of tools to help you previsualize how your final output will appear.
Note: Retiming and interlacing property adjustments (that you make in the Video pane of the inspector) are not displayed in the transcoding preview.
Preview how a transcoded file will look and sound
In a job in the batch area, select the output row that includes the setting you want to preview.
If the Comparison button in the preview area isn’t already selected (highlighted blue), click it to turn on comparison previewing.
Click the Play button .
The source file video plays on the left side of the preview area, and a preview of the transcoded file plays on the right side. The transcoded audio plays through your computer speakers (or through connected speakers).
Zoom in or out in the preview area
Do one of the following:
Pinch open or closed on a trackpad.
Double-tap on a trackpad to toggle the zoom level between 100% and “Fit.”
Click the Zoom pop-up menu (in the upper-right corner of the preview area), then choose a zoom level.
Press Shift-Z to resize the preview area to fit the current available window space.
Tip: To increase the available preview area space, resize the Compressor window, or drag the divider bar between the preview area and the batch area down.
View different areas of a zoomed-in preview area
When the preview area is zoomed in to a level greater than 100%, you cannot view the entire image at once. However, you can scroll the preview area to see more of the image.
Do one of the following:
Swipe the trackpad using two fingers.
Drag the inner box of the navigation control (in the upper-right corner of the zoomed-in preview area).
View closed-caption or subtitle text in the preview area
If your job includes subtitles or closed-caption data, you can view that text in the preview area.
In the batch area, select the output row for the job containing the subtitle or closed-caption data.
If there is more than one subtitle or closed-caption file, select the row for the text you want to view.
In the preview area click the Closed Caption button .
Note: Subtitles can only be added to iTunes Store packages.
For more information about adding closed-caption data to a job, see Add metadata.
In the preview area, you can also add markers, set a poster frame, or identify a portion of the source file to transcode.