Video format

In some smart phones currently on the market or mobile phones that support video capture, we can often see so-called 3GPP-format images. What is the 3GPP format? Simply put, this format is a multimedia standard developed by the "3rd Generation Partnership Project" (3GPP), which enables users to enjoy high-quality multimedia content such as video and audio using mobile phones. Its core consists of Advanced Audio Coding (AAC), Adaptive Multi-Rate (AMR) and MPEG-4 and H.263 video codecs. Currently, most handsets supporting video capture support 3GPP format video playback. 3GP is a video encoding format for 3G streaming media, similar to the MP4 file format, and is widely used as a file format for mobile video. At present, there are better QuickTime6.5 and realplay10 softwares supporting 3GP video. Mainly to develop with the high transmission speed of 3G network, it is also the most common video format in current mobile phones.

MPEG (Moving Picture Experts Group) is a working group established by the International Organization for Standardization (ISO) to develop standards for motion picture compression coding. The standard developed is an international standard called the MPEG standard. Audio and system are composed of three parts. MPEG1 is the VCD video image compression standard; MPEG2 is the DVD/Super VCD video image compression standard; MPEG4 is one of the network video image compression standards, characterized by high compression ratio and clear imaging. MPEG4 video compression algorithm can provide extremely high compression ratio up to 200:1. What's more, MPEG offers a high compression ratio and little loss of data. MPEG4 is the latest image compression technology standard proposed by MPEG.

H.264/AVC is a video processing standard jointly developed by ITU-T VCEG and ISO/IEC MPEG. ITU-T recommends H.264 as a standard and ISO/IEC as an international standard 14496-10 (MPEG-4 part 10). Video Coding (AVC). H.264 not only saves 50% bit rate than H.263 and MPEG-4, but also has better support for network transmission. It introduces an encoding mechanism for IP packets, which facilitates packet transmission in the network and supports streaming media transmission of video in the network. H.264 has strong anti-error code characteristics and can adapt to video transmission in wireless channels with high packet loss rate and serious interference. Supports hierarchical encoding transmission under different network resources to achieve smooth image quality. Can adapt to video transmission in different networks, network affinity is good.

*.RM, one of Real Media's audio/video compression specifications developed by Real Networks. What Real Player can do is use Internet resources to broadcast live audio/video that conforms to Real Media specifications. The Real Media specification mainly includes three types of files: RealAudio, Real Video, and Real Flash (a new generation of high-compression ratio animation formats that Real Networks and Macromedia have jointly developed). The REAL VIDEO (RA, RAM) format from the very beginning was positioning in terms of video streaming applications, and was also the creator of video streaming technology. It can achieve continuous video playback with 56K MODEM dial-up conditions, but its image quality is worse than VCD. If you have seen those RM-compressed DVDs, you can clearly compare them.