Granted Patent B2

US 9,369,508 · App. 13/877,995 · Granted Jun 14, 2016

Abstract

Claims (43)

1. A method of transmitting an HTTP stream comprising:

generating a plurality of segments by dividing video stream by a time unit;

generating a media information file including Universal Resource Locator (URL) information of the plurality of segments and transmitting the media information file to a client;

constructing, for a first representation, a plurality of segments with a first bit rate of scalable video coding;

constructing, for a second representation, a plurality of segments with a second bit rate, which is higher than the first bit rate, of the scalable video coding;

constructing, for a third representation, a plurality of segments with a third bit rate, which is higher than the second bit rate, of the scalable video coding;

receiving a request for transmitting selected segments of specific representation from a client according to a current network environment sensed by the client;

wherein the client parses the media information file, selects the segments of the specific representation suitable for the network environment by referring the parsed information, and generates the request for the selected segments of the specific representation; and

transmitting a scalable video coding stream that includes segments of at least one of the first, and the second, and the third representations, in response to the request;

wherein the third bit rate is double of the first bit rate and the second bit rate is a mean value of the first bit rate and the third bit rate.

2. The method of claim 1 , wherein the scalable video coding complies with a coding scheme according to a scalable video coding standard according to scalable video coding of H.264/AVC.

3. The method of claim 1 , wherein the transmitting of the first representation comprises transmitting at least a part of the plurality of segments for the first representation.

4. The method of claim 3 , wherein the transmitting of the second representation comprises transmitting one of the part of the plurality of segments for the first representation and the part of the plurality of segments for the second representation, and

wherein the transmitting of the third representation comprises transmitting the part of the plurality of segments for the first representation, the part of the plurality of segments for the second representation, and a part of the plurality of segments for the third representation.

5. The method of claim 3 , further comprising; alternately transmitting the part of the plurality of segments for the first representation and the part of the plurality of segments for the second representation, when transmitting the second representation.

6. The method of claim 1 , wherein segments in proportion to the number of representations according to contents information is generated.

7. A server for transmitting an HTTP stream comprising a processor that executes non-transitory computer program code stored on storage media, wherein the non-transitory computer program code includes instructions to:

generate a plurality of segments by dividing video stream by a time unit;

generate a media information file including Universal Resource Locator (URL) information of the plurality of segments;

construct, for a first representation, a plurality of segments with a first bit rate of scalable video coding;

construct, for a second representation, a plurality of segments with a second bit rate of the scalable video coding, wherein the second bit rate is higher than the first bit rate;

construct, for a third representation, a plurality of segments with a third bit rate of the scalable video coding, wherein the third bit rate is higher than the second bit rate;

receive a request for transmitting segments of specific representation from a client according to a current network environment detected by the client;

wherein the client parses the media information file, selects the segments of the specific representation suitable for the network environment by referring the parsed information, and generates the request for the selected segments of the specific representation; and

transmit a scalable video coding stream that includes at least one of at least a part of the plurality of segments for the first representation and at least a part of the plurality of segments for the second representations, and at least a part of the plurality of segments for the third representations in response to the request,

wherein the third bit rate is double of the first bit rate and the second bit rate is a mean value of the first bit rate and the third bit rate.

8. The server of claim 7 , wherein transmitting the first representation includes transmitting at least a part of the plurality of segments for the first representation.

9. The server of claim 8 , wherein transmitting the second representation includes transmitting the part of the plurality of segments for the first representation and the part of the plurality of segments for the second representation and

wherein transmitting the third representation includes transmitting the part of the plurality of segments for the first representation, the part of the plurality of segments for the second representation, and the part of the plurality of segments for the third representation.

10. The server of claim 8 , wherein the transmitter alternately transmits the part of the plurality of segments for the first representation and the part of the plurality of segments for the second representation, when transmitting the second representation.

11. A method of receiving an HTTP stream comprising:

receiving a media information file including information on a plurality of segments, the information on the plurality of segments including URL information of the plurality of segments;

receiving, from an HTTP streaming server, at least one of at least a part of a first representation at least a part of a second representation, and at least a part of a third representation, wherein the first representation has a plurality of segments with a first bit rate of scalable video coding, the second representation has a plurality of segments with a second bit rate of scalable video coding, and the third representation has a plurality of segments with a third bit rate of scalable video coding, wherein the plurality of segments are generated by dividing video stream by a time unit, wherein the second bit rate is higher than the first bit rate and the third bit rate is higher than the second bit rate;

detecting, by a client device, a current network environment;

transmitting a request for segments of specific representation to the HTTP streaming server according to the detected current network environment;

wherein the request for the segments of the specific representation is generated by parsing the media information file and selecting the segments of the specific representation suitable for the network environment according to the parsed information;

receiving, from the HTTP streaming server, at least one of a part of the plurality of segments for the first representation, at least a part of the plurality of segments for the second representation, and at least a part of the plurality of segments for the third representation, in response to the request; and

reproducing the received segments;

wherein the third bit rate is double of the first bit rate and the second bit rate is a mean value of the first bit rate and the third bit rate.

12. The method of claim 11 , further comprising:

receiving, from the HTTP streaming server, a part of the plurality of segments for the first representation in response to the request for transmitting the first representation.

13. The method of claim 11 , further comprising:

alternately receiving, from the HTTP streaming server, the part of the plurality of segments for the first representation and the part of the plurality of segments for the second representation in response to the request for transmitting the second representation.

Assignments (11)