Number of frames in the current video content. (Read Only)
This value may be adjusted as the frameCount changes during playback. The value is most accurate after the video completes a full playthrough.
For URL sources, this will only be set once the source preparation is completed. See VideoPlayer.Prepare.
Note: On WebGL, because the frame rate is not known, the frame count assumes a rate of 24FPS. See VideoPlayer.frameRate.