Adobe, Inc.

Sheng Wei

Viswanathan Swaminathan

Srinivas R Manapragada

Joseph Steele

Embodiments of a system and method for low-latency content streaming are described. In various embodiments, multiple data fragments may be sequentially generated. Each data fragment may represent a distinct portion of media content generated from a live content source. Each data fragment may include multiple sub-portions. Furthermore, for each data fragment, generating that fragment may include sequentially generating each sub-portion of that fragment. Embodiments may include, responsive to receiving a request for a particular data fragment from a client during the generation of a particular sub-portion of that particular data fragment, providing the particular sub-portion to the client subsequent to that particular sub-portion being generated and prior to the generation of that particular data fragment being completed in order to reduce playback latency at the client relative to the live content source.

System and method for low-latency content streaming

In various implementations, a server is configured to execute instructions stored in storage that when executed perform operations that include receiving a hypertext transfer protocol (HTTP) request to stream a video segment of multimedia content to a client device. The video segment is of a video sub-stream of the multimedia content. The operations further include sending the video segment and an audio segment to the client device based on the HTTP request for the video segment. The sending pushes the video segment and/or the audio segment to the client device. The audio segment is of an audio sub-stream of the multimedia content. A plurality of segment sets may be pushed based on the HTTP request for the video segment. Each segment set can include an additional video segment and an additional audio segment that correspond to at least partially concurrent portions of the multimedia content.

Reducing requests for media segments in streaming of multimedia content

Techniques for influencing power consumption of a client while streaming multimedia content from a server over a network are described. For example, a server push strategy is used to push a number of media segments of the multimedia content from the server to the client in response to a single request identifying one of the media segments. Thus, instead of using multiple requests, the media segments are provided to the client by using a single request. Reducing the number of requests influences (e.g., reduces) the power consumption of the client. To optimize the power consumption given current client, server, and/or network conditions, the number of the media segments to be pushed is computed based on parameters associated with these conditions.

Power efficient multimedia content streaming based on a server push

Techniques for influencing power consumption of a client while streaming multimedia content from a server over a network are described. The power consumption is influenced by controlling how many requests are used by the client to receive media segments of the multimedia content from the server. For example, the number of requests is reduced by increasing the durations of the available media segments. Thus, rather than requesting a certain number of media segments each of a particular duration, a lower number of media segments is requested where the requested media segments have longer durations. Although a longer duration generally results in a larger power saving, the length of a requested media segment is balanced against other parameters associated with current conditions of the client, server, and/or network to allow for, for example, adaptive streaming. As such an optimum duration is determined based on different parameters associated with the current conditions.

Power efficient multimedia content streaming based on media segment duration

Embodiments of a system and method for local generation of streaming content with a hint track are described. Embodiments may include receiving a first version of encrypted content comprising encrypted content samples that each include media content and non-content information. Embodiments may also include receiving a hint track including packet header information for a stream of media packets from which the media content was sourced, and offset information identifying locations of encrypted media content within the encrypted content samples. Embodiments may include generating a second version of the encrypted content for streaming, which may include, based on the information of the hint track, identifying the location of media content within the encrypted content samples. Embodiments may include generating media packets within the second version of the encrypted content, each of those media packets including header information from the hint track and the identified media content from the encrypted content samples.

System and method for local generation of streaming content with a hint track

Techniques are disclosed for secure playback of protected multimedia content on a game console using a secret-less application. An SSO model can be used for client authentication at a key server, which eliminates the need of storing or using any secret information in the client application. Further, an encrypted content key generated by a content packager using a public key can be deployed in the key URI of a playlist file, which is sent to the key server. The key server can be configured to decrypt the content key using a corresponding private key. Further, the content key and unencrypted samples are protected in the game console client application from debugging and replay attacks by using additional security checks at both the client and key server. By storing secret information remotely from the game console and using the SSO model, DRM policies can be enforced on an untrusted client application.

DRM protected video streaming on game console with secret-less application

Techniques are disclosed for low latency live video streaming. A client can be configured to send a single HTTP request for live video streaming to a server. The server can be configured to push one or more video segments to the client in response to the request, following a pre-defined push strategy. For example, using a so-called all-push strategy, the client sends only one request to the server, and in response, the server sends all of the video segments to the client as soon as each segment is complete. The HTTP 2.0 protocol may be used for pushing the video from the server to the client. This technique eliminates the request explosion problem when small segments are used. Further, the number of segments pushed with each request can be varied, which is to facilitate adaptive bitrate switching.

Low latency live video streaming

Embodiments of a system and method for detecting a security compromise on a device are described. Embodiments may be implemented by a content consumption application configured to protect content decryption keys on a device, such as a computer system (e.g., a desktop or notebook computer) or a mobile device (e.g., a smartphone or tablet). For instance, the content consumption application may be configured to provide decryption keys for respective content to a media component (or another component of the operating system) if multiple conditions have been met. For instance, in various embodiments, the content consumption application may pass the key to the media component after ensuring that i) one or more security mechanisms of the device operating system have not been compromised and ii) one or more executable instructions of the content consumption application have not been tampered (e.g., instructions corresponding to a function that handles the decryption key(s)).

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San Jose, CA, United States of America

Sheng Wei