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Frame Rate

Last Updated: Jun 07, 2013 06:14AM EDT
Your encoder frame rate setting should be as low as possible to produce the desired result.
Encoding all video at high frame rate is often just a waste of resources, and you can get higher quality video at lower frame rate in many cases.

This is because you have three variables:
  • Bit Rate -- how many 1's and 0's you will produce in one second
  • Resolution -- how many pixels there are in each frame
  • Frame Rate -- how many frames there are in one second
So if bit rate is fixed to, say, 500 Kbps, and resolution if fixed to, say, 640 x 480, then only the frame rate is left to adjust.  A higher frame rate means the encoder must compress more data in one second than a lower frame rate, but because all values are fixed, then the encoder can only alter the quality of the image.

Guidelines
  • 15 fps -- Talking Head Video, such as interviews, seminars, etc. especially when the camera is on a tripod
  • 25 fps -- Good all around setting. Note that this is the standard for television in Europe (PAL)
  • 29.97 or 30 fps -- Use for sports and other high motion video.
Note that because there is a direct relationship between frame rate, resolution, and bit rate, higher frame rates should be used for higher bit rates

 

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