ABPlayer is a video player developed with the Flex 3 SDK. It allows users to post comments onto the playing timeline while playing online video. Comments are scrolled across the screen when the video reaches the timeline position of the comment, allowing interactive and realtime commenting on the video. It also features bottom, top, positioned, and reverse scroll options which allow users to create closed captioning and subtitles for videos. Comments support color, font, size, and opacity, and can have effects, as well. Release Notes: ABPlayer has moved to Flex SDK 4 and now utilizes Spark components for better rendering speed. Advanced comments that have 3d transformations are now supported. The garbage collection for comment instances has been improved, and the interface has been changed slightly. The filter menu now allows deletion of filters more accurately (with no situations of filters unlisted but not removed).