What is the difference between encoding h264h and h264b

The differences are as follows:

1. Version

H.265 is a new encoding protocol, which is an upgraded version of H.264. The H.265 standard retains some of the original technologies of H.264, while improving some related technologies. The new technology uses advanced technology to improve the relationship between code stream, encoding quality, delay and algorithm complexity to achieve optimal settings.

2. Storage space and image quality With the same image quality and the same bit rate, H.265 takes up 50% less storage space than H2.64. If the storage space is the same, it means that H.265 will have higher image quality than H2.64 at the same bit rate. The theoretical value is 30%~40%.

3. Bit rate reduction

Compared with H.264/AVC, H.265/HEVC provides more different tools to reduce the bit rate. In terms of coding units, H. The size of each macroblock (macroblock/MB) in 264 is fixed at 16x16 pixels, while the encoding unit of H.265 can be selected from the smallest 8x8 to the largest 64x64.

Extended information:

Advantages of H.265

1. H.265/HEVC encoding The architecture is roughly similar to that of H.264/AVC, and mainly includes intra prediction, inter prediction, transform, quantization, and deblocking filter), entropy coding (entropy coding) and other modules.

But in the HEVC coding architecture, the whole is divided into three basic units, namely coding unit (CU), prediction unit (PU) and transform unit (TU) .

2. Compared with H.264/AVC, H.265/HEVC provides more different tools to reduce the bit rate. In terms of coding units, each macroblock (macroblock/ MB) size is fixed at 16x16 pixels, while the encoding unit of H.265 can be selected from the smallest 8x8 to the largest 64x64.

3. The intra prediction mode of H.265 supports 33 directions (H.264 only supports 8), and provides better motion compensation processing and vector prediction methods.

4. Repeated quality comparison tests have shown that under the same image quality, the video size encoded by H.265 will be reduced by approximately 39-44% compared to H.264. Due to different quality control measurement methods, this data will also change accordingly.

5. Data obtained through subjective visual tests show that when the bit rate is reduced by 51-74%, the quality of H.265 encoded video can be similar to or even better than H.264 encoded video. It's essentially better than expected signal-to-noise ratio (PSNR).

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