¿Por qué mi archivo comprimido tiene el mismo tamaño?

Why is my compressed file the same size?

For example, most multimedia files will not compress much, as they already exist in a highly compressed state. This second Zip file would not be substantially smaller than the first one (it may even be slightly larger). Again, this is because the data in the original Zip file is already compressed.

Lossless compression can reduce file sizes by up to 50% without losing quality. Lossy compression permanently removes data. For example, a WAV file compressed to an MP3 would be lossy compression. The bit rate could be set at 64 kbps, which would reduce the size and quality of the file.

It’s important to note that compression is not infinite. Compressing a file into a ZIP may reduce its size, but it is impossible to continue compressing the file further and reduce the size to nothing.

Yes, that can happen. Zip has a method for that which will just store the file if it cannot be compressed which means that the file will be a bit longer due to the headers and checksums, but not by much. There are other compression algorithms that make some data very much longer, e.g. the LZW used in GIF.

An alternative to the JPEG compression format is the LZW (for the developers, Lempel-ZIV-Welch) TIFF compression format. LZW TIFFs are considered a lossless file format. LZW TIFF compressions reorder the digital data into a smaller file size without deleting any pixels at all.

Lossy compression is a method of data compression in which the size of the file is reduced by eliminating data in the file. In doing so, image quality is sacrificed to decrease file size. Any data that the compression algorithm deems expendable is removed from the image, thereby reducing its size.

According to Igor Pavlov, developer of 7-zip, the standard zip format underperforms the other two formats by as much as 30 to 40 percent, depending on the type of data being compressed. In a test, Pavlov compressed a full installation of Google Earth 3.0. 0616. The data totaled 23.5 MB before compression.

Compressing Large Video Files. Download Avidemux. To compress a large video into a smaller file, you’ll need compression software that’s specifically for video. Avidemux is a free option that can considerably decrease a video’s size, and it’s available for Windows, Mac, and Linux.

Open that folder, then select File, New, Compressed (zipped) folder. Type a name for the compressed folder and press enter. Your new compressed folder will have a zipper on its icon to indicate that any files contained in it are compressed. To compress files (or make them smaller) simply drag them into this folder.

Simple answer: compressed files (or we could reduce file sizes to 0 by compressing multiple times :). Many file formats already apply compression and you might find that the file size shrinks by less then 1% when compressing movies, mp3s, jpegs, etc.

The optimization is simply this: if the file is small enough, and there’s enough space left over in the directory listing to hold the file’s data, it’s placed there instead of being allocated any clusters at all. In a sense, the file takes up no additional space on disk (zero clusters) beyond its directory listing.

Generally you cannot compress data that has already been compressed. You might even end up with a compressed size that is larger than the input. You will probably have difficulty compressing encrypted files too as they are essentially random and will (typically) have few repeating blocks. Media files don’t tend to compress well.

That way, the signature makes sure no file was altered, including the ToC, and the ToC makes sure no file was added or removed. The output depends on the compression algorithm settings. In the archiver, you can usually set many parameters like compression level, amount of resources to compress/decompress the file etc.