92 results about "Packetized elementary stream" patented technology

A digital recording and playback apparatus adopting an MPEG encoder and decoder, and a method thereof. The digital recording and playback apparatus includes: a first encoder for coding input video data in picture units, and outputting coded video data; a second encoder for coding input audio data and outputting coded audio data; a packetized elementary stream (PES) packetizer for packetizing the coded video data and audio data and user data into each PES, and outputting a video PES, audio PES and user PES; and a transport stream (TS) packetizer for multiplexing the video PES, audio PES and user PES into a TS. The digital recording and playback apparatus can be compatible with a digital television or multimedia applications adopting the MPEG standard, and can perform editing in picture units as well as high-speed search.

The present invention relates to an encoding system for encoding input video data and a multiplexing system for multiplexing a plurality of encoded streams. More particularly, it proposes a system and method that involve describing, in encoded streams, information on the picture order of input video data, and using the picture order information when generating packetized elementary stream (PES) packets, to prevent delays associated with the PES packet generation.

MPEG encoders generate PTS_count and DTS_count based on the information obtained from the number of fields in the input video data and describe the PTS_count and DTS_count data as picture order information in encoded streams. The packetizers for generating packetized elementary stream take out PTS_count and DTS_count described in the encoded streams, generate presentation time stamps and decoding time stamps based on PTS_count and DTS_count, and add these time stamps as PES header data.

There is disclosed an MPEG decoder comprising: 1) a packetized elementary stream (PES) interface for receiving a plurality of packetized elementary streams associated with a single video program; 2) a presentation time stamp (PTS) detection circuit for detecting presentation time stamps in the packetized elementary streams and extracting the presentation time stamps therefrom; and 3) a selection circuit for selecting presentation time stamps associated with a first one of the plurality of packetized elementary streams and transmitting the selected presentation time stamps to a clock generation circuit, wherein the clock generation circuit generates a first reference clock signal used by a first decoder to decode the first packetized elementary stream. The clock generation circuit further generates a second reference clock signal synchronized to the first reference clock signal, wherein the second reference clock signal is used by a second decoder to decode a second packetized elementary stream in synchronization with the first packetized elementary stream.

When one-video program data (layer-coded data) of a plurality of layers is transmitted in a single channel, a video signal is layer-coded in an MPEG system, the layer-coded ES (Elementary Stream) data is converted to a PES (Packetized Elementary Stream) for each layer, and the PES is then converted to a RTP (Real-Time Protocol) packet, which is then converted to a UDP (User Datagram Protocol). An identifier is then annexed to a UDP packet data for each layer to form an IP (Internet Protocol) packet.

There is provided a method for maintaining synchronization between a transport stream and a program stream decoder during a conversion from the transport stream to a program stream. A system reference clock (SCR) is calculated from the transport stream (410). A multiplexer-rate is calculated for the program stream (480). The program stream is formed by multiplexing packetized elementary stream (PES) packets parsed from the transport stream using the calculated multiplexer-rate (480).

Disclosed is a stereoscopic/multiview three-dimensional video processing system and its method. In the present invention, stereoscopic/multiview three-dimensional video data having a plurality of images at the same time are coded into a plurality of elementary streams. The plural elementary streams output at the same time are multiplexed according to the user's selected display mode to generate a single elementary stream. After packetization of the single elementary stream continuously generated, information about the stereoscopic/multiview three-dimensional video multiplexing method and the selected display mode information are added to the packet header of the stream. Then the packetized elementary stream is sent to the image reproducer or stored in storage media. The present invention multiplexes the multi-channel elementary streams having the same temporal and spatial information, thereby minimizing the overlapping header information, and performs streaming of data suitable for the user's demand and the user system environments.

Aspects of a method and system for processing audio and video transport may comprise synchronizing streams with associated program content based on 24-bit presentation time stamps (PTSs) and 32-bit system clock samples (SCSs) field without using decoding time stamps (DTSs). A PTS field may be provided as part of a packetized elementary stream (PES) packet syntax. An SCS field may be provided as part of a transport stream (TS) syntax. A system clock (STC) may be determined from received SCS values. Video and/or audio data may be decoded as soon as they arrive and when there is at least one display and/or presentation frame buffer available. The video and/or audio data may be presented for display and/or play based on a comparison of the PTS and STC values. When a frame does not have an associated PTS, a PTS extrapolation operation may generate an extrapolated PTS value from previously received PTSs.

The ATSC standard for digital television broadcast specifies a data Channel in addition to the normal audio and video channels. A methodology is provided for using the ATSC data Channel to broadcast MPEG-4 video streams, for which a new video service is created. The MPEG-4 streams can be encapsulated into MPEG-2 PES (Packetized Elementary Streams) packets or directly into MPEG-2 transport packets. These mechanisms enable the synchronous broadcast of MPEG-4 streams for an ATSC digital TV system without a change to the ATSC standard when data casting. In a system for transmission of video and audio information, in which the system is constrained to operate pursuant to a given standard, including application of a given coding methodology, transmission of the information using a coding methodology that is independent of the coding methodology is provided through encoding the information into a plurality of increments encoded according to the independent coding methodology; and encapsulating the encoded information increments into a payload portion of transmission packets established according to the given standard.

The invention discloses an audio and video synchronous control method based on a moving picture experts group (MPEG)-2. According to the method, own information dependence on a program stream (PS) and a transition stream (TS) is avoided, and system timing clock (STC) calibration is directly performed on a program timing stream (PTS) information in a packetized elementary stream (PES), so that a synchronization effect can be achieved under the condition that a program clock reference (PCR) or a system clock reference (SCR) are not accurate. According to a solution that the PS is required to be converted to the TS or the TS is required to be converted to the PS, a PCR packet of the TS or a SCR packet of the PS are not required to be rebuilt in a conversion processing program, so that the load of a system processor is reduced, and the program implementation difficulty is reduced.

Video ES and audio ES filters extract video and audio payloads from a transport stream. Video ES and audio ES recording units record the payloads as a PES (Packetized Elementary Stream) or an ES (Elementary Stream). An editing control unit edits the ES recorded by the recording units, on the basis of an editing instruction input from a user interface. A TS generating circuit re-converts the ES edited by the editing control unit into a transport stream and outputs the transport stream.

A method of searching for a broadcasting channel of a specific program in a digital multimedia broadcasting (DMB) receiving terminal. The method includes detecting a program number input by a user, determining whether particular bits in a header of a received transport stream (TS) packet are identical to fixed values for the particular bits in the header, if the particular bits in the header are identical to the fixed values for the particular bits in the header, determining whether particular bits in a payload of the TS packet are identical to fixed values for the particular bits in the payload, and if the particular bits in the payload are identical to the fixed values for the particular bits in the payload, determining that the TS packet has program map table (PMT) information, and analyzing the PMT information to detect a packet identifier (PID) of an audio/video packetized elementary stream (PES) constituting the specific program.

The invention discloses a method for converting a transport stream program into a China Mobile multimedia broadcasting program. Take out the packaged basic code stream package from the stream package; when the transport stream forms a complete packaged basic code stream, take out the packaged basic code stream package from the MPIC transport stream package, and extend the packaged basic code stream to the display time in the header stamp or decoded timestamp, and convert it into the timestamp in the multiplexed frame; take out the elementary stream packet in the packaged elementary code stream, and fill the video elementary stream packet into the video unit according to the requirements of the China Mobile Multimedia Broadcasting Multiplexing Protocol, or Fill the audio elementary stream packet into the audio unit, form a multiplex frame within the set time; encapsulate the multiplex frame and send it.

The invention discloses an audio-video multiplexing device. The multiplexed video ES (Elementary Stream) and audio PES (Packetized Elementary Stream) both are obtained from an external memory, the video ES is generated by a video encoder in an encoding manner, and an audio PES packet is formed by an audio encoder in a manner of encoding and packaging; a CPU (Central Processing Unit) part packages the program specific information (PSI) and the program clock reference (PCR) into a TS (Transmission Stream) packet according to the syntax rules of the transmission stream (TS) in the standard, and simultaneously generates a video PES head and the configuration information needed for other multiplexer hardware accelerators; and the multiplexer hardware accelerator part selects to multiplex the TS packet and a padding packet into the transmission stream with constant output rate according to a multiplexing strategy, wherein the TS packet is formed by packaging of the PSI, the PCR and the audio-video PES. The invention provides an audio-video multiplexing device, which can process high-definition video in real time, and is high in flexibility, simple in hardware structure, small in delay, constant in multiplexing rate and small in PCR jitter.

Presented herein is a scheme for processing multilayered packets. In one embodiment, an application engine aligns a lower level packet header with data objects in the multilayered packet. Additionally, the memory stores the objects of the multilayered packet, such that the objects start at the beginning of a data word. Remainder portions of data words can store 0's. Additionally, an object table stores records comprising object identifiers associated with particular objects, and the address where the particular object is stored.

An apparatus for IP streaming capable of smoothing a multimedia stream is disclosed. The apparatus transmits real-time broadcast through an Internet protocol (IP) network and reduces transmission loss by lowering the influence derived from jitters in an IP network having a burst characteristic. The apparatus is capable of smoothing a multimedia stream in a multimedia stream service outputting data through buffering based on a packetized elementary stream packet unit, which is easy to synchronize voice with video and suitable for the real-time multimedia stream service.

The invention provides a transport stream-based duplex digital television signal seamless switching method and a transport stream-based duplex digital television signal seamless switching system. The method comprises the following steps: acquiring two transport streams of data with the same encoding mode and the same program content; respectively dismounting the two transport streams of data into a plurality of TS (transport stream) packets which take the predetermined number of bytes as a unit, wherein each TS packet comprises at least one PES (packet elementary stream) packet; reading DTS (decoding time stamp) frame information in each PES packet according to a PID (packet identifier) value of the encoding end mark of the PES packet, and taking the DTS frame information as a relative reference time stamp for code stream switching; aligning the two transport streams of data by taking the time stamp as the reference and caching the two transport streams of data; and respectively capturing the TS packets in each transport stream of data and performing continuous counting wrong statistics, outputting one transport stream of data with fewer errors as a main path, and discarding or taking the other transport stream of data with the same time for standby application. The invention discloses a code stream switching technology based on a transport stream base layer; the seamless switching on the objective sense is realized; and the receiving time delay error caused by the difference of channels and modulation modes are effectively evaded.