Quick Answer: What Are Danmaku Bullet Comments?
Danmaku bullet comments are viewer messages displayed over a video. On Chinese platforms they are called danmu (弹幕, dànmù). In a recorded video, a comment can be tied to a point in playback, so viewers who watch later see it at the same moment in the scene.[1][2][4]
- Placement: The text appears over the picture and often moves across it.[1]
- 時機: A message can follow the video clock.[1][4]
- Purpose: Comments can express surprise, add context or respond to one another.[2][3][4]
Several messages can appear together even if viewers wrote them days apart.

A performer finishes a line and a row of short messages moves across the frame. Later viewers see a record of earlier reactions inside the scene. The effect can occur when everyone involved watched the video at a different time.[1][2]
What the Timestamp Does
Imagine a viewer commenting when a song begins at two minutes. On a recorded video, another viewer can encounter the comment at the same two-minute mark the next day. That shared timestamp lets people react to the same scene even when they never watch at the same time. A page-level comment below the video can discuss the same scene, but its position usually does not depend on the playback clock.[1][4]
From Niconico to Chinese Video Sites
The term danmaku comes from Japanese, and the overlay developed on the Japanese video site Niconico. AcFun and Bilibili helped establish this style of commenting on Chinese sites. Early use was associated with animation, comics and game audiences, and the feature spread to other kinds of video.[1][3]
How People Use the Overlay
A short cheer can signal that many people noticed a performance. A question can prompt another viewer to write an explanation at nearly the same point. On a recorded lesson, comments can also accumulate around a difficult passage. In Chinese idol culture, reactions during a stage can be part of the pleasure of watching it with others.[2][3][4]
When to Read With Comments On
Comments can make the pace of shared reactions visible. They can also cover part of the frame or give away a later event. If the scene depends on dialogue, distinguish the video’s subtitles from what viewers have added. On Chinese reality shows, a burst of comments may tell you which reveal drew attention, even when viewers had no role in the programme’s outcome.[1][2]
FAQs About Danmaku Bullet Comments
Are Danmaku Comments Live?
They can appear on livestreams. On a recorded video, older messages may be replayed at their linked timestamps.[1][3][4]
Are Bullet Comments the Same as Subtitles?
Subtitles usually transcribe or translate the video’s content. Bullet comments add audience contributions, even when a viewer uses one to explain a line.[1][2]
Why Do So Many Comments Appear at Once?
A memorable moment can attract several comments at nearly the same timestamp. As new viewers reach it, earlier comments appear together.[2][4]
資料來源
[1] Ulster University Research Portal. Danmaku commenting on China’s video streaming sites
[2] Leticia-Tian Zhang and Daniel Cassany. Making sense of danmu
[3] Global Media and China. Motivations for game stream spectatorship
[4] Discourse, Context & Media. Coherence through sedimentation
