This is a bit difficult, because I use VLC Player. If I take a screenshot it is automatically in 1024x576 and the format is PNG. To change from PNG in JPEG... that would take many time... 93 pictures^^

I will upload the last pictures and then you could look which pictures are useful, ok?

Edit: I've found the mistake^^ Now I can take screenshots in JPG.. but it's too late The last will be in PNG too...