* @param pixel_format Function which is called to decide what pixel format the output image should be;
* it is passed the pixel format of the input image from the ImageProxy, and should return the desired
* output pixel format. Two functions always_rgb and keep_xyz_or_rgb are provided for use here.
+ * @param aligned true if the output image should be aligned to 32-byte boundaries.
+ * @param fast true to be fast at the expense of quality.
*/
shared_ptr<Image>
PlayerVideo::image (dcp::NoteHandler note, function<AVPixelFormat (AVPixelFormat)> pixel_format, bool aligned, bool fast) const