Cisco Technology, Inc.

Tankut Akgul

Ali C Begen

William C Ver Steeg

David R Oran

Michael Anthony Ramalho

Arturo A Rodriguez

In one method embodiment, receiving a video stream comprising a first compressed picture without associated time stamp information and a second compressed picture having associated first time stamp information, the second compressed picture following the first compressed picture in transmission order; deriving second time stamp information based on the first time stamp information; and processing the first compressed picture based on the second time stamp information.

DTS/PTS backward extrapolation for stream transition events

In one method embodiment, providing a multiplex of compressed versions of a first video stream and a first audio stream, each corresponding to an audiovisual (A/V) program, the first video stream and the first audio stream each corresponding to a first playout rate and un-synchronized with each other for an initial playout portion; and providing a compressed version of a second audio stream, the second audio stream corresponding to a pitch-preserving, second playout rate different than the first playout rate, the second audio stream synchronized to the initial playout portion of the first video stream when the first video stream is played out at the second playout rate, the first audio stream replaceable by the second audio stream for the initial playout portion.

Preserving synchronized playout of auxiliary audio transmission

Decoding earlier frames with DTS/PTS backward extrapolation

Auxiliary audio transmission for preserving synchronized playout with paced-down video

Embodiments may be disclosed herein that provide systems, devices, and methods of processing a program stream, the program stream comprising a video and an audio stream. One such embodiment is a method comprising: initializing an audio reference clock to a value associated with a presentation timestamp for a decodable audio frame which is the first audio frame capable of being decoded in the audio stream; initializing a video reference clock to a value associated with a presentation timestamp for a decodable video frame which is the first video frame capable of being decoded in the video stream; storing audio frames received prior to receipt of the decodable video frame which is the first video frame capable of being decoded in the video stream in an audio frame buffer; starting audio and video reference clocks after a video preroll delay, which is the difference between the first decodable video frame PTS and the value of PCR at the time that PTS is received, has elapsed; decoding the audio stream in accordance with the audio reference clock; and decoding the video stream in accordance with the video reference clock.

Supplementary buffer construction in real-time applications without increasing channel change delay

In one method embodiment, receiving from the network device a multiplex of a compressed video stream and a compressed audio stream, the multiplex comprising a succession of intervals corresponding to a video program corresponding to a first playout rate; and at the start of each interval, replacing the compressed audio stream with a compressed, pitch-preserving audio stream corresponding to a second playout rate different than the first.

Buffer expansion and contraction over successive intervals for network devices

In one embodiment, a method of reducing video delay in a program stream comprises: setting an audio reference clock to an initial value based on a presentation timestamp for a frame that is the first decodable frame in the audio stream; setting a video reference clock to an initial value based on a presentation timestamp for a frame that is the first decodable frame in the video stream; starting audio and video reference clocks responsive to the later of a minimum buffer fill delay and receipt of a frame that is the first entire decodable frame in the video stream; decoding the audio stream in accordance with the audio reference clock; and decoding the video stream in accordance with the video reference clock.

Systems and methods of reducing media stream delay through independent decoder clocks

In one embodiment, a method includes inserting a packet containing an interpolated timestamp into a burst media stream. The insertion is responsive to a channel change request. The burst media stream includes a series of cached frames.

Growing community of inventors

Uskudar-Istanbul, Turkey

Tankut Akgul