Squeeze to Letterbox Squeeze to Letterbox Squeeze a clip in 4x3 down to letterbox-style 16x9
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iMovie imovie plugin clip squeeze clip letterbox-style clip squeeze

Squeeze to Letterbox Description

Squeeze to Letterbox Squeeze a clip in 4x3 down to letterbox-style 16x9 Squeeze to Letterbox is a plug-in for iMovie that squeezes a clip in 4x3 down to letterbox-style 16x9.Some video cameras are capable of shooting in 16x9 (widescreen) format rather than the standard TV format of 4x3. Such cameras usually stretch the data to the full 4x3 rectangle in order to maximize the vertical resolution of the stored video. When handling this data, iMovie performs no interpretation of the data; i.e., iMovie presents the 16x9 data in a 4x3 rectangle.This effects filter is designed to efficiently and cleanly squeeze that data into the correct aspect ratio, 16x9, accompanied by the usual letterbox bars.The implementation performs either linear or bicubic interpolation on interlaced or progressive frames. It also utilizes AltiVec (Velocity Engine), if available, so this code also contains a demonstration of vectorized code.

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