![]() ![]() HEAACv2 is the adopted standard for ATSC-M/H and many other systems around the world. It comes with a fully featured toolset which enables coding in mono, stereo and multichannel modes (up to 48 channels). ![]() HE AAC v2 has been proven to be the most efficient audio compression tool available today. It is specifically designed for low bit rate applications such as streaming, mobile broadcasting etc. HEAACv2 or High efficiency advanced audio codec version 2 also known as enhanced aacplus is a low bit rate audio codec defined in MPEG4 audio profile belonging to the AAC family. Hence it is relevant and practical to encode/decode and multiplex/demultiplex both video and audio for replay at the receiver. H.264 covers only video coding and is not of much use unless the video is accompanied by audio. The H.264 has been adopted as the video standard for many applications around the world including ATSC. But the higher codingefficiency comes at the cost of increased complexity. This standard achieves much greater compression than its predecessors like MPEG-2 video, MPEG4 part2 visual etc. It was jointly developed by the VCEG (video coding experts group) of ITU-T (international telecommunication union) and the MPEG (moving pictures experts group) of ISO/IEC (international standards organization). Introduction H.264 is the latest and the most advanced video codec available today. It is shown that during decoding the audio-video synchronization is achieved with a maximum skew of 13ms.ġ. The proposed multiplexing and de-multiplexing algorithms followed to achieve synchronization are explained. It also introduces the concept of timestamps. This paper briefly introduces the MPEG2 systems, two layers of packetization namely program elementary stream (PES) and transport stream (TS). This paper presents a scheme to multiplex the elementary streams of H.264 video and HE AAC v2 audio using the MPEG2 systems specifications, then de-multiplex the transport stream and playback the decoded elementary streams with lip synchronization or audio-video synchronization. In a broadcasting system, multiplexing is a process in which two or more elementary streams are converted into a single transport stream ensuring synchronous playback of the elementary streams and proper buffer behavior at the decoder. MPEG2 part1 specifies two layers of packetization to achieve a transport stream suitable for digital transmission. This allows easy integration of the solution with any digital media workflow and further processing of the report information with any third party systems.Television broadcasting applications such as ATSC-M/H, DVB require that the encoded audio and video streams to be transmitted across a network in a single transport stream containing fixed sized data packets that can be easily recognized and decoded at the receiver. The combined validation report output, containing the multiplex and all elementary streams validation information, can be exported into XML report file, having the full report information in standard XML format. The currently loaded file in the MPEG TS Utils Ultimate can be validated by selecting “Validation” from the “Tools” menu.Īpart from the manual MPEG Transport Stream, AVC.H264 Video, MPEG-2 Video, AAC Audio and MPEG Audio media validation provided in the MPEG TS Utils Ultimate solution, Jongbel Media Solutions also provides automated media validation of the specified media formats in its Media Validatorsolution. The elementary streams validation process is performed by on-the-fly demultiplexing and verifyication of all audio and video elementary streams subsequently. Along with the standard functionality of MPEG TS Utils Pro, the extended product includes AVC/H.264 Video Validation, MPEG-2 Video Validation, AAC Audio Validation and MPEG Audio Validation Modules, which now enables not only the container validation but also the audio and video elementary streams validation. MPEG TS Utils Ultimate is a product extension of the MPEG TS Utils Pro. The currently loaded file in the MPEG TS Utils Pro can be validated by selecting “Validation” from the “Tools” menu. MPEG TS Utils Pro offers MPEG Transport Stream files verification and validation according to the ISO/IEC 13818-1 standard. The application also allows the user to manipulate with transport streams by filtering specified PIDs and exporting to file, demultiplexing to PES and ES streams, converting multi-program TS to single-program TS. MPEG TS Utils can also perform MPEG-2 Transport stream validation according to the ISO/IEC 13818-1 specification. ![]() The application allows the user to investigate the basic transport stream and DVB packets with their fields. MPEG TS Utils solution provides a structural representation of a multiplexed MPEG-2 Transport Streams, compliant with the ISO/IEC 13818-1 specification, and DVB Streams, compliant with the ETSI EN 300 468. ![]()
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