Abstract: A transmission system includes a calculation unit 251 that calculates a jitter pattern sequence of a plurality of packets transmitted by a transmission device 1 via a network using a transmission interval of the plurality of packets and a difference between arrival times at which the packets arrive at a reception device 2, a generation unit 252 that inputs the jitter pattern sequence to a first learning model 254 to generate a state index indicating a state of the network, and a buffer estimation unit 26 that determines a buffer size of a reception buffer 23 of the reception device 2 based on the state index.

Abstract: A video transmission system includes a video transmitter for storing a packet of video data in a transmitting buffer and transmitting the packet stored in the transmitting buffer, a video receiver for receiving the packet, and an estimation unit for estimating a characteristic of a transmission line between the video transmitter and the video receiver from an arrival time of each packet in the video receiver. The video transmitter transmits a packet at a timing specified from an inverse characteristic of a characteristic of the transmission line.

Abstract: A time synchronization device focuses on a possibility of multiplexing a plurality of PTP domains on a transmission line with the same PTP and derives one time based on time information from a plurality of PTP domains. The time synchronization device includes PTP slave units belonging to corresponding PTP domains different from each other and configured to synchronize with times of the corresponding PTP domains, and a time integration unit 12 configured to use time information that is a time after the PTP slave unit synchronizes with the time of a master device belonging to the corresponding PTP domain and synchronization accuracy information that is an accuracy of synchronization of the PTP slave unit with the time of the master device to generate one integrated time.

Abstract: The present disclosure is intended to enable playback of media data corresponding to a sensibility effect set in advance.

Abstract: An object of the present disclosure is to provide a data communication system, a computing apparatus, a data communication method, and a program, which are capable of highly reliable data transfer with low latency between computing apparatuses. The present disclosure achieves a highly reliable communication path by directly connecting computing apparatuses via an optical path and transmitting data through the optical path. Further, the present disclosure uses the optical path to achieve RDAM over wavelength transmission in which existing RDMA-enabled protocol stacks such as InfiniBand and TCP/IP/Ether are eliminated. The present disclosure eliminates the protocol stacks, enabling transfer with lower latency than in a case of “simply performing RDMA transmission over the wavelength path”.

Abstract: An abnormality detection device according to the present invention is a video transmission state abnormality detection device connected via a network to a plurality of video transmission devices, an IP packet transfer device on the transmission side, an IP packet transfer device on the reception side, and a plurality of video reception devices. The video transmission state abnormality detection device prepares a transmission/reception IP flow table by aggregating IP flow information for the devices, detects an abnormality in transmission on the basis of the transmission/reception IP flow table, and specifies the location of the abnormality. The abnormality detection device according to the present invention can automatically detect the amount of traffic and specify which part of a transmission path an abnormality is caused on, without the need for advance setting. Therefore, video or sound traffic can be monitored efficiently.

Abstract: A video audio transmission system, transmission method, sending device, and reception device capable of avoiding buffer overflow and buffer depletion in a decoding device and realizing Group of Pictures (GOP) synchronization in encoding devices by eliminating clock deviation among devices. In the video audio transmission system, the sending devices supply clocks generated from common time point information to cameras as genlock signals. The reception devices supply clocks generated from the common time point information to the decoding devices as genlock signals. Therefore, clock deviation between the devices can be eliminated, and the buffer overflow and the buffer depletion in the decoding device can be avoided. Frame periods of video signals output by a plurality of dispersed cameras can be aligned, and reliable GOP synchronization can be realized by the encoding devices on a latter stage with respect to the cameras.

Abstract: An object of the present invention is to provide a time synchronization device, a time synchronization method, and a program capable of maintaining PTP synchronization accuracy even in a network in which PTP incompatible devices are mixed. The time synchronization device according to the present invention focuses on a possibility of multiplexing a plurality of PTP domains on a transmission line with the same PTP and derives one time based on time information from a plurality of PTP domains.

Abstract: The present disclosure is intended to enable playback of media data corresponding to a sensibility effect set in advance.

Abstract: The present disclosure aims to provide a method for detecting a GOP boundary of an encoded bit stream of each layer and associating GOPs of the layers for hierarchical transmission in a video transmission device that transmits a hierarchically encoded bit stream. The present disclosure provides a video transmission device and a video transmission method that detect a GOP head access unit in a base layer of a hierarchically encoded bit stream by analyzing the base layer and detect a head access unit of an enhancement layer of an identical GOP to that of the aforementioned access unit from a decoding time stamp of the access unit by using the relationship between a decoding time stamp of the base layer and a decoding time stamp of the enhancement layer.

Abstract: The present disclosure aims to provide a method for detecting a GOP boundary of an encoded bit stream of each layer and associating GOPs of the layers for hierarchical transmission in a video transmission device that transmits a hierarchically encoded bit stream. The present disclosure provides a video transmission device and a video transmission method that detect a GOP head access unit in a base layer of a hierarchically encoded bit stream by analyzing the base layer and detect a head access unit of an enhancement layer of an identical GOP to that of the aforementioned access unit from a decoding time stamp of the access unit by using the relationship between a decoding time stamp of the base layer and a decoding time stamp of the enhancement layer.

Abstract: A video audio transmission system, transmission method, sending device, and reception device capable of avoiding buffer overflow and buffer depletion in a decoding device and realizing Group of Pictures (GOP) synchronization in encoding devices by eliminating clock deviation among devices. In the video audio transmission system, the sending devices supply clocks generated from common time point information to cameras as genlock signals. The reception devices supply clocks generated from the common time point information to the decoding devices as genlock signals. Therefore, clock deviation between the devices can be eliminated, and the buffer overflow and the buffer depletion in the decoding device can be avoided. Frame periods of video signals output by a plurality of dispersed cameras can be aligned, and reliable GOP synchronization can be realized by the encoding devices on a latter stage with respect to the cameras.