Method for transreceiving media content and device for transreceiving using same

• US 9,781,188 B2
• Filed: 10/27/2011
• Issued: 10/03/2017
• Est. Priority Date: 11/02/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Hyeonjae, Zia, Waqar, Hong, Hotaek
• Primary Examiner(s): Srivastava, Vivek
• Assistant Examiner(s): Garcia-Ching, Karina J
• Application Number:
  US13/882,926
• Publication Number:
  US 20130238758A1
• Time in Patent Office: 2,168 Days
• Field of Search: 709218
• CPC Class Codes: H04L 67/02 based on web technology, e.g. hypertext transfer protocol [HTTP]
• CPC Class Codes: H04N 21/23439 for generating different versions
• CPC Class Codes: H04N 21/242 Synchronization processes, e.g. processing of PCR [Program Clock References] arrangements for synchronising broadcast or distribution via plural systems in broadcast distribution systems H04H20/18
• CPC Class Codes: H04N 21/44016 involving splicing one content stream with another content stream, e.g. for substituting a video clip
• CPC Class Codes: H04N 21/8455 involving pointers to the content, e.g. pointers to the I-frames of the video stream
• CPC Class Codes: H04N 21/8456 by decomposing the content in the time domain, e.g. in time segments

Abstract

Provided are a method and device for transmitting/receiving media content via internet. The method includes: configuring the media content with a plurality of representations; dividing the configured representation into a plurality segments; aligning subsegments in the segment; and transmitting one of the representations, wherein the subsegments are aligned to allow the earliest presentation time of the kth subsegment in the first representation to be greater than the latest presentation time of the k−1th subsegment in the second representation among the representations.

Claims

1. A method of transmitting media content through an HTTP server, the method comprising:

generating, through a media encoder, the media content with a plurality of representations including a first representation and a second representation;

dividing, through a segmenter, the first representation into a plurality of segments, wherein a plurality of subsegments are included in each segment of the first representation;

dividing, through the segmenter, the second representation into a plurality of segments, wherein a plurality of subsegments are included in each segment of the second representation; and

transmitting, through a transmitter, the plurality of segments of at least one of the first representation and the second representation,

wherein the each segment of the first representation and the second representation includes a segment index box which provides an index on the plurality of subsegments in the each segment,

wherein the plurality of segments of the first representation is indexed by an index segment,

wherein the index segment includes a segment index box which provides an index on a set of the segment index boxes for the plurality of segments of the first representation, and

wherein the segment index box of the index segment has a loop in which segment index information for the plurality of segments of the first representation is included.

2. The method according to claim 1, wherein the plurality of subsegments of the first representation and the plurality of subsegments of the second representation are aligned to allow an earliest presentation time of a mth subsegment of the first representation to be greater than a latest presentation time of a nth subsegment of the second representation.

3. The method according to claim 1, wherein the plurality of subsegments of the first representation and the plurality of subsegments of the second representation are aligned to allow a latest presentation time of a mth subsegment of the first representation to be less than an earliest presentation time of a nth subsegment of the second representation.

4. The method according to claim 1, wherein a mth subsegment of the first representation and a nth subsegment of the second representation are aligned not to be overlapped if TL(m,i)<

TE(n,i) or if TL(n,i)<

TE(m,i), wherein the TE(m,i) is an earliest presentation time of any access unit in stream i of a subsegment of the first representation, the TL(m,i) is a latest presentation time of any access unit in stream i of a subsegment of the first representation, the TE(n,i) is an earliest presentation time of any access unit in stream i of a subsegment of the second representation and the TL(n,i) is a latest presentation time of any access unit in stream i of a subsegment of the second representation.

5. The method according to claim 1, wherein the plurality of representations are differently configured according to a bit rate of the transmitted media content.

6. The method according to claim 1, wherein with respect to a subsegment including a representation access point (RAP) among the subsegments, a presentation time of the first RAP in the subsegment corresponds to the earliest presentation time of the subsegment.

7. The method according to claim 1, further comprising transmitting a media presentation description (MPD) including metadata to access the segments,

wherein the MPD comprises a first flag indicating whether bitstream switching can be performed on the plurality of representations and a second flag indicating whether the plurality of subsegments in the first representation and the plurality of subsegments in the second representation are aligned.

15. The method according to claim 1, wherein each segment index box includes earliest presentation time of an access unit in each subsegment.

8. A device for transmitting media content through an HTTP server, the device comprising:

a media encoder to configure the media content with a plurality of representations including a first representation and a second representation;

a segmenter to divide the first representation into a plurality of segments and the second representation into a plurality of segments, wherein a plurality of subsegments are included in each segment of the first representation and the second representation; and

a transmitter to transmit the plurality of segments of at least one of the first representation and the second representation,

wherein the each segment of the first representation and the second representation includes a segment index box which provides an index on the plurality of subsegments in the each segment,

wherein the plurality of segments of the first representation is indexed by an index segment,

wherein the index segment includes a segment index box which provides an index on a set of the segment index boxes for the plurality of segments of the first representation, and

wherein the segment index box of the index segment has a loop in which segment index information for the plurality of segments of the first representation is included.

9. The device according to claim 8, wherein the plurality of subsegments of the first representation and the plurality of subsegments of the second representation are aligned to allow an earliest presentation time of a mth subsegment of the first representation to be greater than a latest presentation time of a nth subsegment of the second representation.

10. The device according to claim 8, wherein the plurality of subsegments of the first representation and the plurality of subsegments of the second representation are aligned to allow a latest presentation time of a mth subsegment of the first representation to be less than an earliest presentation time of a nth subsegment of the second representation.

11. The device according to claim 8, wherein a mth subsegment of the first representation and a nth subsegment of the second representation are aligned not to be overlapped if TL(m,i)<

TE(n,i) or if TL(n,i)<

TE(m,i), wherein the TE(m,i) is an earliest presentation time of any access unit in stream i of a subsegment of the first representation, the TL(m,i) is a latest presentation time of any access unit in stream i of a subsegment of the first representation, the TE(n,i) is an earliest presentation time of any access unit in stream i of a subsegment of the second representation and the TL(n,i) is a latest presentation time of any access unit in stream i of a subsegment of the second representation.

12. The device according to claim 8, wherein the plurality of representations are differently configured according to at a bit rate of the transmitted media content.

13. The device according to claim 8, the device transmits a media presentation description (MPD) including metadata to access the segments, wherein the MPD comprises a first flag indicating whether bitstream switching can be performed on the plurality of representations and a second flag indicating whether the plurality of subsegments in the one segment of the first representation and the plurality of subsegments in the one segment of the second representation are aligned.

16. The device according to claim 8, wherein each segment index box includes earliest presentation time of an access unit in each subsegment.

14. A device for receiving media content through an HTTP client, the device comprising:

a network interface to receive the media content with one of a plurality of representations including a first representation and a second representation; and

a service control manager to switch between the first representation and the second representation,

wherein the plurality of representation includes a plurality of segments and each segment includes a plurality of subsegments;

wherein the each segment of the first representation and the second representation includes a segment index box which provides an index on the plurality of subsegments in the each segment,

wherein the plurality of segments of the first representation is indexed by an index segment,

wherein the index segment includes a segment index box which provides an index on a set of the segment index boxes for the plurality of segments of the first representation, and

wherein the segment index box of the index segment has a loop in which segment index information for the plurality of segments of the first representation is included.

17. The device according to claim 14, wherein each segment index box includes earliest presentation time of an access unit in each subsegment.