The Video Frames Report is a CSV file where each row in the .csv file corresponds to a single video frame. The column headers describe the specific data points recorded for each frame (e.g., timestamp, frame type, size, etc.). You can refer to ffmpeg documentation for further detail.
After the report is generated, the Video Report Summary dialog will appear, displaying key information about the process. This summary includes: The Codec used to encode the video and the total number of frames reported. Note: This same summary information is also conveniently appended to the bottom of the generated .csv report for easy reference.