There is problem when trying to play ntsc videos (29.97 fps - video ormats h264 mp4-flv-f4v-mov), it drops some frames and stuttering video. So, flex video components has a default video frame rate? i think it is only reading 24 frames , not reading other frames and so stuttering.
Tried it with s:videodisplay, mx:videodisplay, flash.media.Video, org.osmf.elements.VideoElement components and all of it the result is same it is not playing ntsc videos with real frame rates and stuttering. Also tested different videos.