How big is a 30 second PAL DVD clip?

by on December 10, 2012

Q: For a 30 seconds clip in PAL DVD format(704×576, 25 fps, 24 bpp) with stereo sound in a sample rate of 48 kHz, how many bytes are needed?
The way I solved it : {704x576x24x25x30 + 48000×16(bits per sample)x2(stereo) } /1024 =7129500kb
I think I did something wrong cuz a 30 seconds clip can’t never be that big……
Can anyone help me?


3 Responses to “How big is a 30 second PAL DVD clip?”
  1.  
    Picked as best answer

    This is because the DVD video uses MPEG2 video compression to reduce the file size:

    http://en.wikipedia.org/wiki/MPEG-2

     
    •  

      Thanks for ur answer. So was my calculation right?

       
      •  

        You’re numbers add up correctly, but they don’t really have much of a practical basis, other than appreciating the critical importance of video compression.