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MP4 to RMVB format is small and clear. RMVB is a new video format extended from RM video format. RMVB video format breaks the average compression sampling mode of RM format and reasonably utilizes bit rate resources on the basis of ensuring average compression ratio.

Operating environment: Windows 7, Dell G3 PC.

Video is composed of audio stream + video stream, video size and definition and audio stream bit rate and video bit rate and resolution have a great relationship. We'll start with common video formats and conclude with a look at them. First of all, 3GP is mainly used for mobile phones. Most of the videos shot by mobile phones are in this format, mainly because of small capacity and average picture. If you are viewing on a larger screen or computer, it is not recommended to convert to this format.

RM and RMVB, image quality can be, medium capacity, Real Video or Real Media, is a file container developed by RealNetworks. It usually only accommodates Real Video and Real Audio encoded media. This file has some interactivity, allowing scripts to be written to control playback. RM, especially the variable bit rate RMVB format, is very small and popular with network downloaders. RMVB is a new video format extended from RM video format. RMVB video format breaks the average compression sampling mode of RM format and reasonably utilizes bit rate resources on the basis of ensuring average compression ratio. Rmvb is currently the most commonly used video format that also occupies a relatively small space, and the relative quality is also better.

AVI, is the abbreviation of Audio Video Interleaved, the picture quality is clear, generally relatively large. Developed by Microsoft, it is a format that interweaves video and audio together for simultaneous playback. The general *.avi file size is large and the picture quality is good. There are also compressed *.avi files, but since compression standards are not uniform, compatibility issues may arise. WMV, a technical standard for real-time multimedia transmission on the Internet independent of encoding methods, Microsoft hopes to replace technical standards such as QuickTime and file extensions such as WAV and AVI. The main advantages of WMV are scalable media types, local or network playback, scalable media types, streaming prioritization, multilingual support, extensibility, etc.

MPEG1, MPEG2, MPEG4, the picture quality is very clear, the capacity is relatively large. MPEG stands for Motion Picture Experts Group, which includes MPEG-1, MPEG-2 and MPEG-4 (note that there is no MPEG-3, the familiar MP3 is just MPEG Layeur 3). MPEG-1 is believed to be the most contacted by everyone, because it is widely used in the production of VCDs and some network applications for video clips download. It can be said that 99% of VCDs are compressed in MPEG-1 format. Using MPEG-1 compression algorithm, a 120-minute movie can be compressed to about 1.2 GB in size. MPEG-2 is used in DVD production (compression), but also in some HDTV (high-definition television broadcasting) and some high-demand video editing, processing has a considerable application surface. MPEG-2 compression algorithms can compress a 120-minute movie (not a video file) to a size of 4 to 8 GB (of course, MPEG-1 is unmatched in terms of performance such as image quality). MPEG-4 is a new compression algorithm that uses ASF format to compress a 120-minute movie (no video file) into a video stream of about 300 megabytes for viewing on the Internet.

MP4, the most commonly used video format, picture quality is generally better than RMVB, capacity size is also higher. MKV, TS, MKV is used for packaging, just like packaging, relatively large, the picture is very clear, TS common language HD ultra clear, general video capacity and resolution are very large. If you want the video to be small and clear, it is recommended to use RMVB format, the picture and size can be balanced. If the mobile phone or mobile storage device capacity is relatively large, it is recommended to convert to MP4 format.

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