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US RE45,983 E1Granted
Hypothetical reference decoder
AssigneeSharp Kabushiki Kaisha
InventorSachin Govind Deshpande
Life of this patent
Estimating the term…
Abstract
A hypothetical reference decoder.
Claims12
A method comprising:
- (a) defining a first set of at least one value characteristic of a transmission bit rate for a first segment of a video having an associated first segment presentation start time and an associated first segment presentation end time;
- (b) defining a second set of at least one value characteristic of a buffer size for said first segment;
- (c) defining a third set of at least one value characteristic of an initial decoder buffer fullness for said first segment;
- (d) wherein each value within said first set, said second set, and said third set, respectively, is defined so that data received by a decoder for constructing a plurality of video frames of said first segment is free from an underflow state in a buffer of said decoder when said constructing begins at said first segment presentation start time;
- (e) defining a fourth set of at least one value characteristic of said transmission bit rate for a second segment of said video having an associated second segment presentation start time and an associated second segment presentation end time, said second segment presentation start time being later than first segment presentation start time and said second segment presentation end time being the same as, or earlier, than said first segment presentation end time;
- (f) defining a fifth set of at least one value characteristic of said buffer size for said second segment;
- (g) defining a sixth set of at least one value characteristic of said initial decoder buffer fullness for said second segment;
- (h) wherein each value within said fourth set, said fifth set, and said sixth set, respectively, is defined so that data received by said decoder for constructing a plurality of video frames of said second segment is free from an underflow state in said buffer of said decoder when said constructing begins at said second segment presentation start time;
- and
- (i) allowing a user to begin presentation at a user-selected one of said first segment presentation start time, and said second segment presentation start time associated with said second segment.
7 more elements
A method of encoding video, comprising:
- defining a first set of values Ri(where i=1,2, . . . N) characteristic of a transmission bit rate for a video segment;
- defining a second set of values Bi(where i=1,2, . . . N) characteristic of a buffer size for the video segment;
- defining a third set of values Di1(where i=1,2, . . . N) characteristic of a delay until the video segment is presented;
- wherein the first set of values, the second set of values, and the third set of values are defined for the video segment as a whole;
- selecting, for a first portion of the video segment, one of the first set of values Ri, one of the second set of values Bi, and one of the third set of values Di1 such that the first portion of the video segment is free from an underflow condition and an overflow condition by using the selected values Ri, Bi and Di1 as a transmission bit rate, a buffer size and a delay until the first portion of the video segment is presented respectively;
- defining, for a second portion of the video segment, a fourth set of values Dij(where i=1,2, . . . N) characteristic of a delay until the second portion of the video segment is presented,
- wherein the second portion of the video segment is a portion after a prescribed position in the first portion of the video segment;
- and
- selecting, for the second portion of the video segment, one of the fourth set of values Dij, wherein the selecting are such that the second portion of the video segment is free from an underflow condition and an overflow condition by using the unchanged values Ri, Bi and the selected value Dij as the transmission bit rate, the buffer size and a delay of the fourth set of values until the second portion of the video segment is presented respectively.
6 more elements
Dependencies are inferred from the claim text.