/ mtv->img_width;
if(!mtv->img_height || !mtv->img_width || !mtv->img_segment_size){
av_log(s, AV_LOG_ERROR, "width or height or segment_size is invalid and I cannot calculate them from other information\n");
/ mtv->img_width;
if(!mtv->img_height || !mtv->img_width || !mtv->img_segment_size){
av_log(s, AV_LOG_ERROR, "width or height or segment_size is invalid and I cannot calculate them from other information\n");