The "Amsterdam song" was officially released in 2010. Around this time there was a lot of pressure on the ADM boat-peoples by the municipality / harbor authorities to leave the ADM waters...
Frans & Durk are both ADM boat peoples
The black and white footage is from the documentary "Parlevinkers" by Ytzen Brusse (1947)
Ytzen Brusse: nl.wikipedia.org/wiki/Ytzen_Brusse
Subtitled version here: vimeo.com/129034523