Introduction to H.264
H.264 is a next-generation digital video compression format jointly developed by the International Organization for Standardization (ISO) and the International Telecommunication Union (ITU), succeeding MPEG4.
Built upon MPEG-4 technology, the H.264 codec process mainly consists of five parts: inter and intra prediction (Estimation), transform and inverse transform, quantization and inverse quantization, loop filtering, and entropy coding.
The primary goal of the H.264 standard is to provide superior image quality at the same bandwidth compared to other existing video coding standards. With this standard, compression efficiency is approximately doubled compared to previous standards (such as MPEG2) under equivalent image quality.
Advantages of H.264Low Bit Rate: Compared to compression technologies like MPEG2 and MPEG4 ASP, H.264 reduces the data volume to about 1/8 of MPEG2 and 1/3 of MPEG4 under the same image quality.
High-Quality Images: H.264 delivers continuous, smooth, high-quality images (DVD quality).
Strong Error Resilience: H.264 provides necessary tools to handle errors such as packet loss that commonly occur in unstable network environments.
High Network Adaptability: H.264 includes a Network Abstraction Layer (NAL), enabling H.264 files to be easily transmitted over various networks (e.g., the Internet, CDMA, GPRS, WCDMA, CDMA2000, etc.).
Like previous standards, H.264 is a hybrid coding model combining DPCM and transform coding. However, it adopts a "back-to-basics" simplified design with fewer options, achieving significantly better compression performance than H.263++. It enhances adaptability to various channels by using a "network-friendly" structure and syntax, which facilitates handling of bit errors and packet loss. Its application scope is broad, meeting the needs of different bitrates, resolutions, and transmission/storage scenarios.
