Systems and Methods for Content Delivery Network Selection in Video Streaming Systems
Techniques for serving a manifest file of an adaptive streaming video include receiving a request for the manifest file from a user device. The video is encoded at different reference bitrates and each encoded reference bitrate is divided into segments to generate video segment files. The manifest file includes an ordered list of universal resource locators (URLs) that reference a set of video segment files encoded at a particular reference bitrate. A source manifest file that indicates the set of video segment files is identified based on the request. An issued manifest file that includes a first URL and a second URL is generated based on the source manifest file. The first URL references a first domain and the second URL references a second domain that is different from the first domain. The issued manifest file is transmitted to the user device as a response to the request.
1 . A method for directing adaptive streaming video delivery from multiple content delivery networks, comprising:
monitoring, by a manifest serving system, performance metrics of a plurality of content delivery networks (CDNs);
receiving from a user device, by the manifest serving system, a request for a particular adaptive streaming video;
generating manifest information, using the manifest serving system, designating one or more CDNs from the plurality of CDNs for retrieval of the particular adaptive streaming video based upon the monitored performance metrics; and
issuing to the user device, by the manifest serving system, the manifest information.
2 . The method of claim 1 , wherein designation of the one or more CDNs is further based upon a geographic location of networks in the plurality of CDNs.
3 . The method of claim 1 , wherein designation of the one or more CDNs is further based upon a geographic location of a name server receiving the request for obtaining the particular adaptive streaming video.
4 . The method of claim 1 , wherein the designated one or more CDNs are assigned priorities based upon a distribution policy.
5 . The method of claim 1 , wherein monitoring the performance metrics comprises receiving, by the manifest serving system, information regarding performance of a given CDN from a performance manager of the given CDN.
6 . The method of claim 1 , wherein the manifest serving system comprises a plurality of manifest servers, and the method further comprising selecting a receiving manifest server from the manifest serving system to receive the request based on at least one of: the requesting user device, deterministic distribution of requests, the receiving manifest serving system having previously processed requests for the particular adaptive streaming video; or relative network distance to a location of the user device from the receiving manifest serving system.
7 . The method of claim 1 , further comprising assigning a session ID, and incorporating the session ID in the manifest information.
8 . The method of claim 1 , wherein each CDN is an independently managed CDN.
9 . The method of claim 1 , wherein the monitored performance metrics comprise at least one of: availability, performance, load, network performance, or whether the particular adaptive streaming video is in memory.
10 . The method of claim 1 , wherein designation of the one or more CDNs comprises providing a hostname for a network as part of the manifest information.
11 . The method of claim 1 , wherein the manifest information is stored in a manifest file, and issuing the manifest information to the user device comprises transmitting the manifest file to the user device.
12 . The method of claim 1 , further comprising, collecting, by a given CDN from the plurality of CDNs, performance metrics about the given CDN; and transmitting the collected performance metrics to the manifest serving system.
13 . The method of claim 1 , further comprising requesting, by the user device using the manifest information, the particular adaptive streaming video from a first CDN of the designated one or more CDNs.
14 . The method of claim 13 , further comprising receiving in response to the requesting, by the user device, a manifest file from the first CDN, the manifest file comprising a plurality of uniform resource locators (URLs) for requesting segments of the particular adaptive streaming video from one or more segment file servers in the first CDN.
15 . The method of claim 14 , wherein the segments of the particular adaptive streaming video are stored within video segment files.
16 . The method of claim 13 , further comprising receiving in response to the requesting, by the user device, a manifest file from the first CDN, the manifest file comprising a plurality of uniform resource locators (URLs) for requesting segments of the particular adaptive streaming video from one or more segment file server clusters in the first CDN.
17 . The method of claim 16 , wherein the segments of the particular adaptive streaming video are stored within video segment files.
18 . A method for directing adaptive streaming video delivery from multiple content delivery networks, comprising:
monitoring, by a manifest serving system, performance metrics of a plurality of content delivery networks (CDNs);
receiving from a user device, by the manifest serving system, a request for obtaining a particular adaptive streaming video;
generating manifest information, using the manifest serving system, designating one or more CDNs from the plurality of CDNs for retrieval of the particular adaptive streaming video based upon the monitored performance metrics, where each designated CDN is assigned a priority;
issuing to the user device, by the manifest serving system, the manifest information;
requesting, by the user device based upon the manifest information, the particular adaptive streaming video from a first CDN of the designated one or more CDNs; and
receiving, by the user device, the particular adaptive streaming video from the first CDN.
19 . The method of claim 18 , wherein each CDN is an independently managed CDN.
20 . The method of claim 18 , wherein the manifest information is stored in a manifest file, and issuing the manifest information to the user device comprises transmitting the manifest file to the user device.