Given the nominal duration of one video frame, this function will check some standard framerates for a close match (within 0.1%) and return one if possible,
It will calculate an arbitrary framerate if no close match was found, and return false.
It returns false if a duration of 0 is passed.
| duration |
Nominal duration of one frame |
| dest_n |
Numerator of the calculated framerate |
| dest_d |
Denominator of the calculated framerate |
|
true if a close "standard" framerate was recognised, and false otherwise. |