Transitions Effects For C# Video Software - repost

My current software creates slideshow videos, but there are no transitions. The software creates the video using BMP images, soundtrack and timings based on either user added sound files, text to speech sound file... then the output is with ffmpeg into one of 3 formats. What I would like to add are some cool transition effects. The software creates temporary BMP files which are later deleted, but they remain to be used in the video so the transition images would need to be done the same way. Transition Effects that I would like to achieve are along the lines of a whiteboard type movie. So moving from slide to slide with some pan and zoom. If it helps you do this I can give you a temp folder with 8 images as an example. Other effect would be more simple sliding up down left or right ... so one slide while going out pulls next one in. I have wasted a few weeks with a coder who assured me he could do this, and I have literally wasted days of my time testing 2 apps he made only to still have no transitions working, and so its time to find someone to do this, or buy a commercial dll. Surprise me with your work!