2. Personally, I suggest using Intel processor for video processing. AMD processors have no advantage in multimedia. You can use an Intel i3 processor. The typical power consumption of i3 is 73W, which is slightly higher than that of 65W processor, but the output can save a lot of time, which may be more energy-saving considering comprehensively.
3. Personally, it is not recommended to do video processing open core overclocking, because the output time may be long (usually several hours or even 10 hour) and the CPU load is heavy. If it is a little unstable, it will crash or the program will not respond, so it is necessary to start all over again. AMD's processor's shielded cores are all flawed, but only in some extreme test environments will these cores expose problems (such as long-term high-load operation), so it is no problem for ordinary families to play games or open cores, but it is not recommended to open cores when CPU is required to run under high load.