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It's a common usecase to request a video size after crop. Before this patch, user must know the video size before crop, then set crop_right/crop_bottom accordingly. Since HEVC can have different CTU size, it's not easy to get/deduce the video size before crop. With the new width/height options, there is no such requirement. Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>