@sierdzio Thank you a lot for your answer !
Your explaination on the opaque pointer is clear, I didn't have that notion before.
With this knowledge, most of my questions are wrong, like the 5th.
@SGaist thanks for response.
Assume we use http://www.openh264.org/, I guess we would compile it for our Raspberry Pi based platform.
Correct ?
Are there steps to configure QT (or underlying libs) to use newly compiled openh264 codec ?