I found a video on YouTube that shows 4 of shorts of the first animated feature film featuring the Smurf characters. These shorts were first shown in Belgium back in 1965. Unfortunately, these shorts were never released on DVD. Also these shorts were over shadowed by "The Smurfs and The Magic Flute" which was the first animated movie featuring the smurfs.Which was released in Belgium in 1976. The series is called "Les Aventures des Schtroumpfs" (The Adventures of the Smurfs) which is in black and white. What a rare find for fans of The Smurfs franchise. These shorts were never released outside of Belgium and the only language is French. Today, you can find these shorts being shown in Belgium's comic book museum. Also the shorts were being shown back in 2008 in honor of 'The Smurf's 50th Anniversary".
Here's two link for each of the shorts.[link][link]
I almost thought "The Adventures of the Smurfs" were lost films.