Because this file is a widely shared internet artifact, you can find the "full piece" (the complete walking loop with the Phonk music) on most major video platforms:
The video file named is a well-known viral clip, most commonly recognized as a high-quality loop of the character Dr. Livesey from the 1982 Soviet animated film Treasure Island .
"FlatScornfulDodo" is a randomly generated URL string from the site Gfycat (similar to how Twitch clips or Imgur links are named). It became the "canonical" name for this specific high-definition crop of the walking animation. Where to Watch
The specific "full piece" you are likely looking for is the (also known as the "Why Not" meme), where the character and his crew walk toward the camera with an exaggerated, rhythmic gait. Origins and Context