H.265 is a new video coding standard developed by ITU-T VCEG after H.264. H.265 complies with the existing video coding standard H.264, retains some original technologies and improves some related technologies.
The new standard uses advanced technologies to improve the relationship between code streams, coding quality, delay and algorithm complexity, achieving optimal settings.
The specific research contents include: Improve the compression efficiency, improve the robustness and error recovery capability, reduce the real-time delay, reduce the channel acquisition time and random access delay and reduce the complexity. H.264 allows SD digital videos to be transmitted at a speed lower than 1 Mbit/s. H.265 allows 720P HD digital videos to be transmitted at a speed of 1–2 Mbit/s.
Average bit rate reduction compared with H.264 (from Wikipedia):
Bit rate: the number of bits that are conveyed or processed per unit of time. The bit rate is quantified using the bits per second unit (bit/s). The bit rate represents the bandwidth usage.
Frame rate: a frame is a static picture. Continuous frames form an animation, such as a TV video.
The frame rate is the number of frames transmitted in one second, or the number of times that the graphics processor can be refreshed every second. Generally, the unit is frames per second (FPS).
Resolution: the resolution is the number of pixels displayed on the screen. When the screen size is the same, the higher the resolution is, the better the display effect is. The resolution is generally represented by CIF, QVGA, VGA, 4CIF, 720P, 1080P, 4K.
Packet loss: media packets may be lost during transmission on the network, causing d discontinuous media signals.
Delay: delay refers to the time required for a packet to be transmitted from one end to another end.
Jitter: the data packets are assembled at a specified interval by the sender and sent to the network in sequence. However, when the peer end receives the packets, the packets are randomly displaced. The variation in packet delay is called jitter. For example, voice packets are assembled and sent at a 20 ms interval by the sender. However, after the peer end receives the first packet, it may receive the second packet after 100 ms, then receive four packets after 10 ms and then receive three packets after 50 ms.
Redundancy: audio and video media packets are transmitted in UDP mode, and packet loss may occur during transmission. Therefore, multiple same packets (probably calculated) are sent to the peer end so that the peer end can restore the lost packets using the redundant packets.
