I'm looking for a library specialized at compressing Jpegs even further without changing the image. I've found PackJpeg but it doesn't provide any source code and you're not allowed to use it...

I'm looking for a JavaScript function that given a string returns a compressed (shorter) string. I'm developing a Chrome web application that saves long strings (HTML) to a local database. For tes...

I have an audio file which has both leading and trailing silence and with the following specifics: Codec: MPEG AAC Audio (mp4a) Channels: Stereo Sample rate: 44100 Hz Bitrate: 253 kbps I want to ...

Is it possible to do completely lossless encoding in h264? By lossless, I mean that if I feed it a series of frames and encode them, and then if I extract all the frames from the encoded video, I w...

I have a large file of size 500 mb to compress in a minute with the best possible compression ratio. I have found out these algorithms to be suitable for my use. lz4 lz4_hc snappy quicklz blosc ...

DNA strings can be of any length comprising any combination of the 5 alphabets (A, T, G, C, N). What could be the efficient way of compressing DNA string of alphabet comprising 5 alphabets (A, T, G...

I was recently compressing some files, and I noticed that base64-encoded data seems to compress really bad. Here is one example: Original file: 429,7 MiB compress via xz -9: 13,2 MiB / 429,7 MiB ...

I am trying to encode signed values ranging from -256 <-> 255 (i.e. 9 bit data represented by short) with arithmetic encoder, however I have discovered that existing implementations of Ari...

I understand that JPEG is a lossy compression standard, and that the 'quality' factor controls the degree of compression and thus the amount of data loss. But when the quality number is set to 100...

In honor of the Hutter Prize, what are the top algorithms (and a quick description of each) for text compression? Note: The intent of this question is to get a description of compression algorith...

I tried various methods to do data compression when saving to disk some numpy arrays. These 1D arrays contain sampled data at a certain sampling rate (can be sound recorded with a microphone, or a...

I have a motion-JPEG 2000 file that I need to determine if the creator used lossless compression to create it based on the file itself. I do not have the raw video data to compare to, and I do not ...

I've got 100's (maybe 1000's) of products with 10-30 images of each product coming to an online store I've put together. I need to optimize the images' file sizes as much as possible without loosin...

I'm doing optimization and Google recommends Lossless compression to images, looking for a way to implement this in Django. Here's the images they specified, I think for it to be done effectively ...

My friend told me it existed but I could never find it, not sure if he was lying but I'm very interested as to how the proof works. (Yes, I'm one of those people who found out about Huffman coding ...

Can anyone please explain arithmetic encoding for data compression with implementation details ? I have surfed through internet and found mark nelson's post but the implementation's technique is in...

Background: I have an implementation of a generic LZSS backend on C++ (available here. The matching algorithm I use in this version is exceedingly simple, because it was originally meant to compres...

I understand the LZ77 and LZ78 algorithms. I read about LZ4 here and here and found code for it. Those links described the LZ4 block format. But it would be great if someone could explain (or dir...

This C program is just 143 characters long! But it “decompresses” into the first 10,000 digits of Pi. // Created by cheeseMan on 30/11/13. long a[35014],b,c=35014,d,e,f=1e4,g,h; int main(int ar...

I want my program to be able to use zlib, lzma, lzo and bzip2 compression algorithms. Is there any compression library for C which simlifies working with multiple algorithms (like libmcrypt suppor...

I have a need to compress a video stream to transfer it from a C++ library to a Java platform (Android) by network and decompress it there. The requirements are as follows: The library must be av...

Google PageSpeed recommends the images on my web page could be optimized. The lossless compression would save an average of 11%, however my images are created with the following FFmpeg comman...

Does anyone of you know a lossless compression algorithm, which produces headerless outputs? For example do not store the huffman tree used to compress it? I do not speak about hard coded huffman t...

I am trying to losslessly compress an image, and in order to take advantage of regularities, I want to convert the image from RGB to Y'CbCr. (The exact details of what I mean by RGB and Y'CbCr are ...

Is there someone that can tell me how to write 'jpeg' file using lossless compression in java? I read the bytes using the code below to edit the bytes WritableRaster raster = image.getRaster(); ...