How to create a low-noise MPEG1 movie using gnuplot outputs such as PNG files as frames

• Example No.1 : time evolution of wavefunction of one-dimensional motion
  
  • MPEG-1 movie(4.9MB, 640x480pixels, 300frames/10sec, the above picture is the 300th frame)
  • package of necessary files(tar+gz,6.9kB) to create the movie, which consists of
    • explantion(readme.txt)
    • Makefile
    • C program(wf.c, UTF-8 including Japanese characters)
    • gnuplot script file(wf.plt)

(2011/3/7) For newer versions of ffmpeg, and for its fork "avconv", specify an option "-qscale 0" instead of "-sameq". (Thanks to S.Takahara)