Today I was sent an AAF file which is to be imported into our application. The file is generated by Avid and It has interploted video speed change effect on one clip. Since the edit protocol only requries SpeedRatio for VideoSpeedControl, It's not surprising that this file contains some custom parameters to define the speed interpolation. However, I found out there are actually two custom parameters with IAAFVaryingValue contained in the relevant OperationGroup (all the other parameters have constant values).
So my question is: doesn't anyone know which parameter (or both?) defines the interpolation effect and how shall I interpret them?
The two parameters are PARAM_OFFSET_MAP_U and PARAM_SPEED_MAP_U.