【摘要】 H.265视频编解码通常用于超高清视频，但由于数据量大，编解码算法复杂，会导致较大的视频端到端传输时延。该文提出了一种针对4K视频流H.265编解码的低时延解决方案，采用同步机制的异构多核ARM+FPGA架构，在RAM端搭建Linux操作系统实现多任务处理和实时监控，在FPGA端实现并行加速的H.265编码格式。利用该方案对4K@60 Hz，像素格式YCbCr 4∶2∶0，颜色深度8 bits的视频进行测试。测试结果显示，端到端时延仅为29.5 ms，其中捕获时间为2 ms，编码时间为5 ms，解码时间为10 ms，显示时间为12.5 ms，传输速度提高了45.5%。通过比较分析，该方法在保证高压缩率的情况下，具有低时延传输的明显优势。更多还原

【Abstract】 H.265 video codec is usually used for ultra HD videos. However,due to the large amount of data and complex codec algorithm,the end-to-end video transmission delay is relatively large. In this paper,a low latency solution for 4K video stream H.265 codec is proposed. A heterogeneous multi-core ARM+FPGA architecture based on synchronous mechanism is adopted. Linux operating system is built on the RAM side to realize multitasking and real-time monitoring,and parallel accelerated H.265 encoding format is implemented on the FPGA side. This scheme is used to test the video with 4K@60 Hz,pixel format YCbCr 4∶2∶0 and color depth of 8 bits. Test results show that the end-to-end delay is only29.5 ms,including capture time of 2 ms,encoding time of 5 ms,decoding time of 10 ms,display time of12.5 ms,transmission speed increased by 45.5%. Through comparative analysis,this method has the obvious advantage of low latency transmission under the condition of guaranteeing high compression rate.更多还原