MPD hierarchy diagram (each Rrepresentation uses fMP4 file format) fMP4įMP4 (fragmented MP4), which can be simply understood as fragmented MP4, is the media file format adopted by DASH, and the file extension is usually (.m4s or directly use. Among them, the most important ones are: Initialization Segment (each Representation contains 1 Init Seg), Media Segment (The media content of each Representation contains several Media Segs)!įigure 1. For example, 480p video, 720p video, 44100 sample audio, and 22050 sample audio, all use Representation description.Įach Representation is divided into multiple segments. MPD files are organized in XML format, see Figure 1 for their hierarchical structure.Ĭorresponds to an optional output (alternative). The description file of the media file (manifest), which is similar to the m3u8 file of HLS. Seamless switching between different image quality content provides a better playback experience. Other adopters of DASH include: Netflix, Hulu,… What is DASHĪ streaming media solution for server and client:ĭivide the video content into pieces, each piece can have different encoding forms (different codec, profile, resolution, bit rate, etc.) Ĭan freely choose the media fragments that need to be played adaptive bitrate streaming technology can be implemented. YouTube adopts DASH! Both the web and mobile apps use DASH. To solve the above problems, a streaming media solution needs to be introduced.

The bitrate cannot be adjusted adaptively according to the network conditions (YouTube enables adaptive bitrate by default, check the 'Auto' in the image quality option) When the image quality is switched (1080P/HD/SD), the player will have a black screen and go back to the key frame to play again.Ģ. DASH: Introduction and usage (this article)Īfter the introduction of XXXX, (compared to competing products) the video viewing experience on the web page has the following problems:ġ.

Ffmpeg download segments