RM is a video file format developed by RealNetworks. It uses the RealPlayer player, that is, a program for streaming audio and video files. The format contains audio and video data or links to streaming, which can be played back as it downloads. The RealMedia Player program was in great demand when they connected to the Internet using a modem, and when there was practically no broadband access to the global network. The large compression ratio of the format provided the opportunity to carry out online transmission of video and audio data. The quality of the output file, as a rule, was low. Today, such files are often used in order to broadcast Internet radio and Internet video. In the .RM format, music and video are found on the global network or on Western cable channels, on Internet radio stations. Support for this format is carried out by such mobile phones and smartphones as Nokia, Ericsson, Sony, iPhone, as well as mobile devices that operate on the Google Android operating system. Files with the extension .RM are compressed using proprietary codecs RealVideo and RealAudio. Individual Real Media files can be played using a VLC media player that partially supports RM files.
H264 is a licensed video compression standard that is necessary in order to obtain a high degree of video stream compression while maintaining good quality. The H264 format has been widely used to record, process and store data from an external surveillance camera. That is, a file with an extension of H264 is essentially a video. The file was developed by Video Coding Experts Group. The specificity of the H264 format is that video data is compressed to a minimum size. Moreover, the resolution settings for video and audio quality are at a high level. The format is innovative. He found widespread use on vehicle video recorders and outdoor surveillance cameras. H.264 is a video compression codec that requests the video container needed to store encoded videos. This is a proprietary video codec that uses highly efficient compression algorithms and delivers great video quality. The main advantage of the H264 format is its high compression ratio when it is necessary to maintain the proper quality of video and audio data. When working with video recorders such as a camera and a DVR, which can be long and even continuous, this is very important if it is not possible to clean the physical memory. For users, the H264 video format is very popular. And therefore, there is practically no problem with playing back an H264 file. It can be opened online. For this, standard Windows tools are used. Say Media Player. Specialized programs are also used.