int sample_aspect_den; /**< the denominator of the pixel aspect ratio */
int display_aspect_num; /**< the numerator of the image aspect ratio in case it can not be simply derived (e.g. ITU-R 601) */
int display_aspect_den; /**< the denominator of the image aspect ratio in case it can not be simply derived (e.g. ITU-R 601) */
+ int luma_function;
};
extern mlt_profile mlt_profile_init( const char *name );