compression

In my app I'm trying to upload some videos that the user picked from gallery. The problem is that usually the android video files are too big to upload and so- we want to compress them first by lower bitrate/ resolution. I've just heard about the new MediaCodec api that introduce with API 16 (I perviously tried to do so with ffmpeg). What I'm doing right now is the following: First decode the input video using a video decoder, and configure it with the format that was read from the input file. Next, I create a standard video encoder with some predefined parameters, and use it for encoding the

I use GZIPOutputStream or ZIPOutputStream to compress a String (my string.length() is less than 20), but the compressed result is longer than the original string. On some site, I found some friends said that this is because my original string is too short, GZIPOutputStream can be used to compress longer strings. so, can somebody give me a help to compress a String? My function is like: String compress(String original) throws Exception { } Update: import java.io.ByteArrayOutputStream; import java.io.IOException; import java.util.zip.GZIPOutputStream; import java.util.zip.*; //ZipUtil public

How can one detect the type of compression used on the file? (assuming that .zip, .gz, .xz or any other extension is not specified). Is this information stored somewhere in the header of that file? Mark Adler You can determine that it is likely to be one of those formats by looking at the first few bytes. You should then test to see if it really is one of those, using an integrity check from the associated utility for that format, or by actually proceeding to decompress. You can find the header formats in the descriptions: Zip (.zip) format description , starts with 0x50, 0x4b, 0x03, 0x04

I'm trying to load a couple of files into the memory. The files have either of the following 3 formats: string TAB int string TAB float int TAB float. Indeed, they are ngram statics files, in case this helps with the solution. For instance: i_love TAB 10 love_you TAB 12 Currently, the pseudocode of I'm doing right now is loadData(file): data = {} for line in file: first, second = line.split('\t') data[first] = int(second) #or float(second) return data To much of my surprise, while the total size of the files in disk is about 21 mb, when loaded into memory the process takes 120 - 180 mb of