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Adobe Premiere Elements 15 Manual

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Saving and sharing your movies
Last updated 10/4/2016
About compression keyframes
Compression keyframes are different from the keyframes that you use to control track or clip properties, such as audio
volume or clip rotation. When you export a movie, Premiere Elements automatically places compression keyframes at
regular intervals in the movie. During compression, these keyframes are stored as complete frames. The frames
between the keyframes are called intermediate frames. Premiere Elements compares each intermediate frame to the
frame before it and stores only the data that is different. This process can greatly reduce file size, depending on the
spacing of the keyframes. Fewer keyframes and more intermediate frames result in smaller file sizes with lower-quality
images and playback. More keyframes and fewer intermediate frames result in significantly larger file sizes with higher-
quality images and playback.
For example, a video of a talking person has a smaller file size than a video with lots of action, because only the mouth
and tiny facial expressions change frame to frame. In contrast, a video of a sporting event requires numerous keyframes
and intermediate frames, because the action changes considerably frame to frame. This results in either a larger file size
or lower quality playback, depending on how much you compress the video.
Choosing compression settings is a balancing act. You need to adjust the setting depending on the type of video
material, the target delivery format, and the intended audience. Often, the optimal compression setting is arrived at
through trial and error.
More Help topics
Viewing clip properties
Supported file types for saving and exporting
The following file types are available when you export or share files. Additional file types may be available with your
video capture card or third-party plug-ins.
Supported video formats for export
• 3GP
• Animated GIF - Windows only
• Microsoft AVI (.avi)
• MPEG-2 (Multimedia Compatible .mpg)
• MPEG-2 (DVD-compatible .mpg)
• MPEG-2 (1080i 25, 1080i 30, 720p 25, 720p 30)
• MPEG-4 (.mp4, .mov, .avi)
• QuickTime (.mov)
• Windows Media (.wmv) - Windows only
Supported still image formats for export
• Adobe Title Designer (.prtl)
Supported sequence formats for export
• JPEG sequence
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