TMZ Sports has obtained more video from the night Dallas Goedert was knocked out inside a South Dakota bar ... and the new footage shows the NFLer got in a patron's face before the attack.

In the clip, you can see Goedert -- wearing a black shirt and holding a drink -- puts his finger on a man's chest, walks him backward and then gets nose-to-nose with him.

Seconds later, Goedert puts his hand on the man again and appears to push him backward ... and that's when the 25-year-old tight end got violently rocked in the face by another man.