I rename the file hellovideo-H264-2 to hello.264, "file hello.264" gives "hello.264: JVT NAL sequence", mplayer gives
Playing hello.264.
H264-ES file format detected.
Video: Cannot read properties.
No stream found.
at least, mplayer can play hellovideo-H264-2 with color bar, but it can not play hello.264 at all. Now I am officially lost.....