The main purpose of compressing files is to make the files smaller and easier to store. If the size remains unchanged, there is no special meaning. In the previous article, the editor told you how to compress the file to the minimum? Some netizens reported that they were compressing When checking the file, I found that the size of the file after compression is almost the same as the source file. What is going on? In fact, the reason for this will be clear as long as you know the principle of 360 compression.
360 compression principle
The basic principle of compressing files is to find repeated bytes in the file, and create a "dictionary" file with the same bytes, and represent it with a code. For example, if there are several places in the file that have the same word "People's Republic of China", use a The code represents and writes the "dictionary" file, so that the purpose of reducing the file can be achieved. Compress the binary code of the file and reduce the adjacent 0 and 1 codes. For example, if there is 000000, it can be changed into 60 written with six zeros to reduce the space of the file.
Why does the size of compressed files with 360° compression remain unchanged?
This means that your file no longer has duplicate bytes. Why is there no more bytes? It is very likely that your file has been compressed, such as some jpg formats, mp3 formats, video formats, etc., which are themselves Those that have been compressed can be merged without duplicate parts. If they are compressed again and merged, it will cause the situation that they cannot be decompressed.
Which format files will be compressed to maintain the same size:
Some picture files, music files, video files, and already compressed files do not change much in size when compressed. jpg, png, MP3, MP4, RMVB, AVI, wma, rm, flash, mp4, mid, 3GP, rar, zip, tar, cab, uue, jar, iso, z, 7-zip, ace, lzh, arj, gzip,bz2
How to compress to make it smaller:
Use other format compression, such as 7z, or use volume compression. For specific details, please see: How to set the compressed file size to the minimum in 360 Compression
Summary: The above is all the content of "360 Compression: Why the compressed file size has not changed_Analysis of the reasons why the compressed file size has not changed". Reminder: rar format files that are already compressed very solidly may increase in size if you use Winrar to compress them.
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