Taraweeh 8 or 20?

https://www.youtube.com/watch?v=r3GCrNlNxwk

What do you think of what this person has to say about the number of prayer of Taraweeh?
Does someone has evidence that goes against what he is saying?
Is what he speaks the truth?

I am aware that other threads were made about the number of Taraweeh prayers, but i wanted to know if any of your opinions on the matter changed in light of this video. Jazakum Allah.

[TABLE="class: grid, width: 100%, align: center"]
[TR][TD]Is Taraweeh 8 or 20 Rakah - Sh.Yasir Qadhi - YouTube
Full lecture http://www.youtube.com/watch?v=qUxpOb0Wclk...[/TD][/TR][/TABLE]

http://www.darultahqiq.com/perfecti...ہ-وسلم-performed-20-rakats-of-tarawih-prayer/

[TABLE="class: grid, width: 100%, align: center"]
[TR][TD]Perfecting the Proofs that the Prophet (صلی اللہ علیہ وسلم) Performed 20 Rak'ats of Tarāwīh Prayer
In this special-treatise by Dr. Abul Hasan Hussain Ahmed, a newly discovered Hadith-from the well known Sahabi, Jabir ibn Abdullah (ra) has been men...[/TD][/TR][/TABLE]