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Crop, resize, and preserve the pixel aspect ratio of your source video.
When you source from a file, the encoder can detect the size of the source video before encoding begins; when you source from devices or screen captures, the input size cannot be detected before encoding. For this reason, when sourcing from devices or screen captures, you should specify the input size when you crop and resize video. When you do so, the encoder will detect the actual input size when encoding begins. If the actual input size is different than the size you specified, the percentage of cropping you specified (rather than the actual pixel values) will be applied to the actual input size.
When you apply your changes to the session but have not yet begun encoding, the precropped image is displayed in the Input area on the Video panel of the main encoder window. (Unless you are sourcing from a capture device that supports hardware cropping, in which case, the cropped image is displayed.) During encoding, the cropped image is displayed in both the Input and Output areas.