Abstract: Systems, methods, and devices for generating a constant bitrate (CBR) transport stream in manners that facilitate subsequent reconstruction, and for performing such reconstruction are disclosed herein. For example, generating a CBR transport stream may include for each payload packets: sampling a clock source to obtain a clock sample; and inserting an encoding of the clock sample in a stuffing area of a header of the payload packet. For example, reconstructing a CBR transport stream may include receiving a plurality of packets of a variable bitrate (VBR) transport stream; for a pair of adjacent packets in the VBR transport stream: extracting a clock sample from a header of each of the pair adjacent packets; computing a delta between the clock samples; and inserting one or more null packets between the adjacent packets based on the computed delta and a timing metric corresponding to a bitrate of the CBR transport stream.

Abstract: Systems, devices, and methods for providing alternative content in audio-video streams are disclosed. A manifest data structure including data reflective of a plurality of content segments is generated. At least one alternative content indicator, each indicating one of said plurality of content segments as being an alternative content segment is obtained. The manifest data structure is modified to remove data reflective of those of said plurality of content segments that are not indicated by said one of said alternative content indicators as being an alternative content segment. Upon receiving a request from a client device to view alternative content, the modified manifest data structure is sent to the client device.

Abstract: Disclosed here are methods, systems, and devices for measuring visual quality degradation of digital content caused by an encoding process. There is received first data for a digital content item, which is not encoded by the encoding process, and second data for the digital content item, which is encoded by the encoding process. For a given artefact type, the first data and the second data are processed to obtain a first quality metric measuring visual quality degradation in the digital content item attributable to the given artefact type caused by the encoding process. A stored mapping corresponding to the given artefact type is applied to the first quality metric to obtain a second quality metric which measures visual quality degradation in the digital content item attributable to the given artefact type caused by the encoding process and approximates subjective assessment of the digital content item by a human visual system.

Abstract: Interactive editing of a web application at a user end station is described. The user end station dynamically loads into a running instance of the web application an interactive editor that allows editing of one or more user interface (UI) components of that running instance of the web application. A selection of a DOM element of the web application is received and a UI component that corresponds to the selected DOM element is determined. A set of parameters associated with the determined UI component is also determined. A value editor is displayed that is configured to display for at least one of the set of parameters a value and allows for that value to be modified. A modification of at least the value of the at least one of the set of parameters is received and the running instance of the web application is updated to reflect the modified value.

Abstract: Disclosed here are methods, systems, and devices for measuring visual quality degradation of digital content caused by an encoding process. There is received first data for a digital content item, which is not encoded by the encoding process, and second data for the digital content item, which is encoded by the encoding process. For a given artefact type, the first data and the second data are processed to obtain a first quality metric measuring visual quality degradation in the digital content item attributable to the given artefact type caused by the encoding process. A stored mapping corresponding to the given artefact type is applied to the first quality metric to obtain a second quality metric which measures visual quality degradation in the digital content item attributable to the given artefact type caused by the encoding process and approximates subjective assessment of the digital content item by a human visual system.

Abstract: Interactive editing of a web application at a user end station is described. The user end station dynamically loads into a running instance of the web application an interactive editor that allows editing of one or more user interface (UI) components of that running instance of the web application. A selection of a DOM element of the web application is received and a UI component that corresponds to the selected DOM element is determined. A set of parameters associated with the determined UI component is also determined. A value editor is displayed that is configured to display for at least one of the set of parameters a value and allows for that value to be modified. A modification of at least the value of the at least one of the set of parameters is received and the running instance of the web application is updated to reflect the modified value.

Abstract: A client-side FEC selection system involves pre-generating FEC data for a plurality of media segment streams based on a number of FEC configuration settings at a server. Metadata relative to the FEC data may be provided to a client device via appropriate manifest files or other mechanisms, whereupon the client device is operative to select and request a suitable FEC data fragment responsive to monitoring various network characteristics.