Thanks Zoran, that helped me a lot.
I can see how to create keyframe aligned renditions with ffmpeg. Do you know of any commercial encoders that might also perform this. I notice Telestream Episode can do most things, but not sure about keyframe alignment. Apple Compressor?, Others? As we have so much media to do, it is worth looking for an automated way to create the renditions.
But considering the other way, to get Wowza transcoder to create the renditions from a live stream, if done this way I think it would be a human process to create the SMIL, play/capture the stream, and name it correctly for VOD.
While I like the idea of using Wowza Transcoder and NVENC to crunch through all the existing media files, it sounds like setting it up to do this will be quite a manual task without getting under the hood with your API.
Thanks for your extensive and helpful documentation.
George