Changes between Version 4 and Version 5 of WiMAX/WiMAX-Tutorial/Dash/00
- Timestamp:
- 07/21/13 12:37:58 (11 years ago)
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WiMAX/WiMAX-Tutorial/Dash/00
v4 v5 5 5 == The Idea == 6 6 7 Dash running o nHTTP, is a server-client system. A HTTP Server runs on the server side and provides the media content to the client upon request. The media (MPEG-4 or MPEG-2 video) is divided into several chunks based on both timing and bit-rate. A Media Presentation Description file in XML format serves as a map of the media, enabling the server to send the chunks requested based on the rate adaptation, affected by channel conditions, at a given time.7 Dash running over HTTP, is a server-client system. A HTTP Server runs on the server side and provides the media content to the client upon request. The media (MPEG-4 or MPEG-2 video) is divided into several chunks based on both timing and bit-rate. A Media Presentation Description file in XML format serves as a map of the media, enabling the server to send the chunks requested based on the rate adaptation, affected by channel conditions, at a given time. 8 8 9 9 … … 16 16 17 17 We will run a series of experiments trying to evaluate 3 primitive dash rate adaptation policies. 18 * Policy 1: When the buffer is less than 30% full, the bit-rate is becomes 0 ==> The client requests the video inthe lowest available bit-rate.18 * Policy 1: When the buffer is less than 30% full, the bit-rate is becomes 0 ==> The client requests the video at the lowest available bit-rate. 19 19 * Policy 2: No provision for the bit-rate. 20 20 * Policy 3: When the buffer is less than 30% full, the bit-rate is halved.