Q: What are the common video compression technologies?
A: Common video compression technologies include the following:
(1) JPEG: The compression ratio is 20 to 80 times, which is suitable for the compression of static images, and there is no room for resolution.
(2) MPEG1 and MPEG2: The compression ratio of MPEG1 and MPEG2 is approximately 100 times (image size is 35 times that of normal VCD and DVD) when the image does not move much. The resolution of MPEG1 depends on the specifications of VCD and DVD. For 320×240 (or less), MPEG2 is usually 720×480. MPEG1 and MPEG2 are partial pictures that transmit different actions.
(3) MPEG4: The compression ratio is 450 times (up to 800 times for still images), and the resolution input can be from 320x240 to 1280x1024. It is the latest MPEG standard for the real-time transmission of audio/video signals over the Internet for mobile communication devices such as mobile phones. Compared with the previous versions of MPEG4 and MPEG, the biggest difference is that MPEG4 uses the “layer†method, which can intelligently select the differences between images, and edit individual images under compression to greatly reduce the capacity of the image files. Accelerate audio/video transmission.
(4) H.263: Developed for streaming video at bandwidths as low as 20K to 24Kbps, allowing users to expand bandwidth utilization and achieve full motion video (30 frames per second) at rates as low as 128Kbps. It is based on the H.261 codec, but theoretically only half the bandwidth is required to achieve the same video quality as H.261.
(5) H.264: A new natural video coding (compression) standard developed by ISO/IEC MPEG JVT (Joint Video Team, Joint Video Team) and ITU-T VCEG (Video Coding Experts Group). This is called the 10 part of MPEG-4, "Advanced Video Coding." H.264 is also a hybrid coding mode of DPCM plus transform coding, but it adopts a "regressive basic" concise design, achieves much better compression performance than H.263++, and enhances adaptability to various channels, adopting " The "network-friendly" structure and grammar facilitate the handling of bit errors and packet loss. In terms of technology, the H.264 algorithm has a very high coding efficiency, and can save about 50% of the code rate compared with H.263 under the same reconstructed image quality. The H.264 code stream structure network has strong adaptability, increases the error recovery capability, and can well adapt to the application of IP and wireless networks.
A: Common video compression technologies include the following:
(1) JPEG: The compression ratio is 20 to 80 times, which is suitable for the compression of static images, and there is no room for resolution.
(2) MPEG1 and MPEG2: The compression ratio of MPEG1 and MPEG2 is approximately 100 times (image size is 35 times that of normal VCD and DVD) when the image does not move much. The resolution of MPEG1 depends on the specifications of VCD and DVD. For 320×240 (or less), MPEG2 is usually 720×480. MPEG1 and MPEG2 are partial pictures that transmit different actions.
(3) MPEG4: The compression ratio is 450 times (up to 800 times for still images), and the resolution input can be from 320x240 to 1280x1024. It is the latest MPEG standard for the real-time transmission of audio/video signals over the Internet for mobile communication devices such as mobile phones. Compared with the previous versions of MPEG4 and MPEG, the biggest difference is that MPEG4 uses the “layer†method, which can intelligently select the differences between images, and edit individual images under compression to greatly reduce the capacity of the image files. Accelerate audio/video transmission.
(4) H.263: Developed for streaming video at bandwidths as low as 20K to 24Kbps, allowing users to expand bandwidth utilization and achieve full motion video (30 frames per second) at rates as low as 128Kbps. It is based on the H.261 codec, but theoretically only half the bandwidth is required to achieve the same video quality as H.261.
(5) H.264: A new natural video coding (compression) standard developed by ISO/IEC MPEG JVT (Joint Video Team, Joint Video Team) and ITU-T VCEG (Video Coding Experts Group). This is called the 10 part of MPEG-4, "Advanced Video Coding." H.264 is also a hybrid coding mode of DPCM plus transform coding, but it adopts a "regressive basic" concise design, achieves much better compression performance than H.263++, and enhances adaptability to various channels, adopting " The "network-friendly" structure and grammar facilitate the handling of bit errors and packet loss. In terms of technology, the H.264 algorithm has a very high coding efficiency, and can save about 50% of the code rate compared with H.263 under the same reconstructed image quality. The H.264 code stream structure network has strong adaptability, increases the error recovery capability, and can well adapt to the application of IP and wireless networks.
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