BTW, rendering straight to a video format is never a good idea, best to render to PNG and then composite to video afterward. The two biggies are:
- If the machine crashes, the power goes out, etc., ALL of your render is lost when rendering to a video format and you have to render everything again from the beginning. With stills like PNG you can just pick up and continue where you left off
- Video compression is baked in at render time if rendering to a video format. If it turns out to be inadequate, you have to redo the render from the start. With rendering to stills, you can just redo the video encoding part of the process
Just as an fyi :)