A video commentary system receives video content items from users in a community. Such video content items are presented to viewers in the community. The system presents submission controls through which the viewers can submit feedback related to specific time points within that presentation. The controls can be used to submit textual, video, or audio comments. The controls can include labeled buttons that viewers can activate to submit categorized comments. Each submission is associated with a timestamp corresponding to the current video frame. The user interface includes regions that display, in real-time, the submissions received from the viewers. Submissions can indicate their timestamps. A bar graph indicates, by category and by time interval, quantities of categorized comments that have been received relating to various time intervals in the presentation.