Abstract: Methods, systems, and non-transitory computer readable storage media are disclosed for two-phase encoding a digital video based on downsampling distortion of the digital video and a constant rate factor transition threshold. For example, the disclosed system can determine a downsampling distortion indicating a measure of distortion resulting from downsampling an input digital video. The disclosed systems can utilize the downsampling distortion to determine a constant rate factor transition threshold for selecting sets of encoding parameters. For example, the disclosed systems can select a first set of encoding parameters below the constant rate factor transition threshold and a second set of encoding parameters at or above the constant rate factor transition threshold. Additionally, the disclosed systems can generate first and second sets of digital video encodings of the input digital video by utilizing the first and second sets of encoding parameters, respectively.

Abstract: Methods, systems, and non-transitory computer readable storage media are disclosed for two-phase encoding a digital video based on downsampling distortion of the digital video and a constant rate factor transition threshold. For example, the disclosed system can determine a downsampling distortion indicating a measure of distortion resulting from downsampling an input digital video. The disclosed systems can utilize the downsampling distortion to determine a constant rate factor transition threshold for selecting sets of encoding parameters. For example, the disclosed systems can select a first set of encoding parameters below the constant rate factor transition threshold and a second set of encoding parameters at or above the constant rate factor transition threshold. Additionally, the disclosed systems can generate first and second sets of digital video encodings of the input digital video by utilizing the first and second sets of encoding parameters, respectively.

Abstract: Techniques are described that enable a user to share videos having dynamic overlays on a social networking system. In some examples, a server computing device may receive, at a first time from a first client device, a first video. For instance, the server computing device may begin receiving the first video after the first client device has concluded capturing the first video, but has not yet completed customizing the first video. The server computing device may receive, at a second time after the first time and from the first client device, a dynamic overlay including customizations to be applied to the first video. The dynamic overlay may be transmitted separately from the first video. In examples, the server computing device generates a second video by applying the dynamic overlay to the first video. The server computing device then provides the second video to a second client device.

Abstract: A method for designing an impeller with a small hub-tip ratio includes the following steps: S1: obtaining an outer diameter D of the impeller with the small hub-tip ratio; S2: determining the number of blades and an airfoil of the blade of the impeller with the small hub-tip ratio; S3: obtaining a blade solidity sy at a rim of the impeller with the small hub-tip ratio and a blade solidity sg at a hub of the impeller with the small hub-tip ratio; S4: dividing the blades of the impeller with the small hub-tip ratio into m cylindrical sections in an equidistant manner, marking the cylindrical sections as 1-1, 2-2, . . . , m-m in sequence from the hub to the rim, and obtaining an airfoil setting angle ?L of each of the cylindrical sections; and S5: performing a correction on the value of the airfoil setting angle ?L in S4.

Abstract: A method for designing an impeller with a small hub-tip ratio includes the following steps: S1: obtaining an outer diameter D of the impeller with the small hub-tip ratio; S2: determining the number of blades and an airfoil of the blade of the impeller with the small hub-tip ratio; S3: obtaining a blade solidity sy at a rim of the impeller with the small hub-tip ratio and a blade solidity sg at a hub of the impeller with the small hub-tip ratio; S4: dividing the blades of the impeller with the small hub-tip ratio into m cylindrical sections in an equidistant manner, marking the cylindrical sections as 1-1, 2-2, . . . , m-m in sequence from the hub to the rim, and obtaining an airfoil setting angle ?L of each of the cylindrical sections; and S5: performing a correction on the value of the airfoil setting angle ?L in S4.

Abstract: A secure virtual machine system, method, and computer program product implemented on a processor are provided for processing a third party's content for output. At least one processor is provided. Additionally, at least one secure virtual machine implemented on the processor is provided for interpreting a second party's program that processes and outputs a third party's content. The virtual machine system abstracts the underlying processor hardware allowing implementation variations across products to execute the same program identically. Furthermore, the scope of the programmable operations, the types of input & output variables, and execution of programs within the processor, is deliberately constrained within the virtual machine environment, in order to mitigate potential security leaks by programs, and to ensure confidentiality of second party's secrets, and third party's content as managed by the second party's program.

Abstract: A method, computer program product, and system are provided for multi-threaded video encoding. The method includes the steps of generating a set of motion vectors in a hardware video encoder based on a current frame of a video stream and a reference frame of the video stream, dividing the current frame into a number of slices, encoding each slice of the current frame based on the set of motion vectors, and combining the encoded slices to generate an encoded bitstream.

Abstract: A system, method, and computer program product are provided for buffering an audio video (AV) stream, audio/video header information, and an audio/video elementary stream for hardware audio/video digital rights management (DRM) processing. In operation, an AV stream encrypted under a shared symmetric key in an M2TS format is buffered, where the AV stream includes content including at least one of audio or video and all content data associated with the AV stream is removed at picture level and below, with the exception of content headers associated with the content data. Additionally, content header information encrypted under the shared symmetric key is buffered, the content header information indicating locations of the content headers associated with the content data. Further, a content elementary stream encrypted under a hardware secret key is buffered for consumption of a hardware bit stream decoding engine.

Abstract: A video processing system, method, and computer program product are provided for encrypting communications between a plurality of graphics processors. A first graphics processor is provided. Additionally, a second graphics processor in communication with the first graphics processor is provided for collaboratively processing video data. Furthermore, such communication is encrypted.

Abstract: A system, method, and computer program product are provided for generating and securing a program, and secrets including confidential keys, capable of being executed utilizing a processor to decrypt content. In operation, a second party's program for decrypting content from a third party is generated by a second party, and then secured in a process involving the second party in such a manner that it can be subsequently executed on the processor, without revealing the contents of the second party's program, nor any secrets provided by third party, or used by the second party, in securing the program, nor any portion of the third party's content while being handled by the program.

Abstract: Methods, devices, and systems of protecting a secret are provided. Access to the secret is designed to be restricted to a code with a specific signature, or fingerprint. The signature of that code is used in the encryption of the secret, and other codes are prevented from using this signature to decrypt the secret. This restricted access to the secret prevents the secret from being easily compromised, for example, by preventing a change in the code.

Abstract: An apparatus, system, method, and computer program product are provided for executing a program provided a second party utilizing a processor to generate keys for decrypting content of a third party. In operation, content and a program to confidentially generate keys for decrypting the content of the third party are received at a processor. Additionally, the second party's program is executed utilizing the processor-derived keys to decrypts the third party's content.

Abstract: An apparatus, system, method, and computer program product are provided for executing a program provided a second party utilizing a processor to generate keys for decrypting content of a third party. In operation, content and a program to confidentially generate keys for decrypting the content of the third party are received at a processor. Additionally, the second party's program is executed utilizing the processor-derived keys to decrypts the third party's content.

Abstract: A secure virtual machine system, method, and computer program product implemented on a processor are provided for processing a third party's content for output. At least one processor is provided. Additionally, at least one secure virtual machine implemented on the processor is provided for interpreting a second party's program that processes and outputs a third party's content. The virtual machine system abstracts the underlying processor hardware allowing implementation variations across products to execute the same program identically. Furthermore, the scope of the programmable operations, the types of input & output variables, and execution of programs within the processor, is deliberately constrained within the virtual machine environment, in order to mitigate potential security leaks by programs, and to ensure confidentiality of second party's secrets, and third party's content as managed by the second party's program.

Abstract: A system, method, and computer program product are provided for generating and securing a program, and secrets including confidential keys, capable of being executed utilizing a processor to decrypt content. In operation, a second party's program for decrypting content from a third party is generated by a second party, and then secured in a process involving the second party in such a manner that it can be subsequently executed on the processor, without revealing the contents of the second party's program, nor any secrets provided by third party, or used by the second party, in securing the program, nor any portion of the third party's content while being handled by the program.

Abstract: A video processing system, method, and computer program product are provided for encrypting communications between a plurality of graphics processors. A first graphics processor is provided. Additionally, a second graphics processor in communication with the first graphics processor is provided for collaboratively processing video data. Furthermore, such communication is encrypted.