user10523: Recently, a video has been posted about a politician named Varoufakis sticking his middle finger to Germany.
Later, a German TV host admitted faking Varoufakis 'middle finger' video on YouTube, showing some smart germans editing it using a software.
As a skeptic person, I'm not sure which one is the real one (statements of authority, videos uploaded do not really make me believe anything).
I only believe in evidence.
How can I know or basically prove (or be 99.999%) sure that a video is faked or staged using a software? What would be the methods or procedures? I would appreciate if a video professional would help me.

user3592: Authenticity in video is dead.  It's been dead in photography for a long time.  It's just something we're all going to have to get used to.  Professional forensic analysis might sometimes disprove a video's authenticity, but it will never be able to conclusively prove it.

10523: <p>Recently, a video has been posted about a politician named Varoufakis sticking his <a href="https://youtu.be/MEUWxNifJJ8?t=40m47s" rel="nofollow">middle finger</a> to Germany.</p>

<p>Later, a German TV host admitted faking Varoufakis 'middle finger' video on <a href="https://www.youtube.com/watch?v=Vx-1LQu6mAE" rel="nofollow">YouTube</a>, showing some smart germans editing it using a software.</p>

<p>As a skeptic person, I'm not sure which one is the real one (statements of authority, videos uploaded do not really make me believe anything).</p>

<p>I only believe in evidence.</p>

<p>How can I know or basically prove (or be 99.999%) sure that a video is faked or staged using a software? What would be the methods or procedures? I would appreciate if a video professional would help me.</p>
 3592: <p>Authenticity in video is dead.  It's been dead in photography for a long time.  It's just something we're all going to have to get used to.  Professional forensic analysis might sometimes disprove a video's authenticity, but it will never be able to conclusively prove it.</p>
