flickering problem on some car materials .


I made a quick movie using sequencer.
I have a couple of question :

1 - at the start of the sequence there’s a static frame. very annoying … how can I remove it?

2 - when camera starts moving there is small flickering on the object but when camera moves away from object the flickering gets worse and worse. It happens to some material with tiny dotted normal maps (maybe!).

3 -and also ground has problem as shown in picture.

please let me know what I can do.
thank you