What is h264 video file format?

What is h264 video file format?

H.264 is the latest format defined by the MPEG-4 standard, and it is also one of the most technically available video coding formats, representing the latest technology, some also called AVC (Advanced Video coding), a video compression standard. is a widely used format for recording, compressing, and publishing high precision video.

H.264 hardware Applications-Hd-dvd/Blu-ray (Blu-ray)

The DVD Forum (DVD Forum) and the Blu-Ray Disc Association (Blu-ray Disc Association) are discussing the ability to support high-definition (high definition) content (storage capacity completely exceeding the current DVD) Successor to the next-generation DVD format: HD-DVD and Bd-rom

It is reported that the HD-DVD will be forced to adopt MPEG-4 avc/h.264, and Blu-ray support was MPEG-4 avc/h.264.

So avc/h.264 is very likely to be the next generation video format, and will be widely used and supported, just like today MPEG-2 (for DVDs)!

With the demand of the market, getting good image quality and low bandwidth image fast transmission has become the two difficult problems in video compression with the lowest possible storage. To this end, ieo/iec/and ITU-T two major international Organization for Standardization to develop a new generation of video compression standard H.264.

H.264, like the previous standard, is also a hybrid encoding mode with DPCM and transform encoding. But it uses "return basic" concise design, do not have many options, obtains much better compression performance than MEPG-4; H.264 strengthens the adaptability to various channels, and uses the structure and syntax of "network friendliness", which is advantageous to the treatment of false friends and packet loss; The H.264 application target range is wide and can meet the needs of different rates, different resolution and different transmission (storage) situations.

Technically, there are several flash places in the H.264 standard, such as unified VLC symbol coding, high-precision, multimodal displacement estimation, based on 4 block integer transformations, layered coding syntax, and so on. These measures make the H.264 algorithm have high coding efficiency, under the same reconstructed image quality, can save about 50% of the code rate than the H.263. H.264 's Code flow structure network is adaptable, which increases the ability of error recovery, and can adapt to the application of IP and wireless network well.

About DVD and H264 video formats

Question 1: On the computer, see the low bit rate of the H264 format film in the sharpness of the slightest worse than the DVD, but the volume is only about 2/5 of the DVD, this is why? So why not replace DVDs with H264? In this way, is not a piece of D5 will be able to install more high definition of film?

Question 2: The definition of the supposedly DVD should be better than the H264 higher (after all, many H264 from the DVD), but when I looked directly at the DVD on my computer, I found that the resolution was only 720x480, and the general H264 resolution was 960x540 (higher than DVD), Are those 960x540 H264 format movies on the Internet all come from Blu-ray DVD format or HDV but it is said that Blu-ray and HD-DVD can be used to replay digital video with a higher bit rate (up to a few mbps/s of the maximum 9 points above a normal DVD), which is not the crux of the problem, What I want to ask is, why so high-rate DVDs on a computer monitor (without comparing the H264 format to a big-screen color TV), the sharpness is not as much as the code rate than its lower H264 (video code rate is only 1411Kbps, but 1.4Mbps) and 1080P HD ( Next, video bit rate and ordinary DVD equivalent, 5Mbps or so? DVD MPEG-2 Compression technology is really outdated, resulting in a large amount of data to suppress, but the effect is not as much as the amount of data than it is a lot of H264?

Problem 1: Low bit rate of H264 hardware requirements, the general computer configuration can not see, watching DVDs is P3 enough

Question 2: The real H264 resolution is 720P, 1080I, 1080P three kinds, no 960x540, after the H264 quality and the original can not compare, the original H264 is the film, not Blu-ray or DVD-turned, Some of the 950x540 formats on the web come from HD and blu, and partly to the TV HD switch.