Tells the encoder to change the encoding frame rate, which is calculated as follows.
fps = iFrameRate × 1,000 ÷ iClkRatio
For example, when uFrameRate = 60 and uClkRatio = 1,001, the frame rate is 59.94 fps.
If successful, returns true. If unsuccessful, returns false. Call AL_Encoder_GetLastError to get the error code.