compression

I am Successful in encoding a series of image captured by AVCaptureVideoPreviewLayer of AVFoundation Framework into a Video using AVAssetWriter and AVAssetWriterInput. But the size of the video is too large, Can anyone of you suggest me a tutorial or atleast a direct me in this case or give me the correct Video output Settings for video compression. I am using the following VideoOutputSetting. videoOutputSettings = @{ AVVideoCodecKey: AVVideoCodecH264, AVVideoWidthKey: [NSNumber numberWithInt:width], AVVideoHeightKey: [NSNumber numberWithInt:height], AVVideoCompressionPropertiesKey: @{

I'm trying to understand the effect of the Block Size and best strategy of choosing the Coefficients in DCT compression. Basically I want to ask what I wrote here: Video Compression: What is discrete cosine transform? Lets assume the most primitive compression. Making block of an image. Performing a DCT on each blog and zeroing out some coefficients. To my understanding, the smaller the block the better. Smaller blocks means the Pixels are more correlated hence the energy in the DCT spectrum is more "Compact". It should be more emphasized in a fast varying images (High Frequency). Let's say we

I am trying to write a batch script that will run automatically compressing subdirectories using winrar or 7-zip: Example: My Pictures Pics1 (Pics1.zip) File1.jpg File2.jpg File3.jpg Pics2 (Pics2.zip) File4.jpg File5.jpg Pics3 (Pics3.zip) File6.jpg File7.jpg ... How do i write script. (1) Using WinRAR: WinRAR includes two command-line tools, rar.exe and unrar.exe , where rar.exe compresses and unrar.exe uncompresses files. Both are located in the C:\Program Files\WinRAR folder in the installable version. Assuming, if there are multiple subfolders under C:\MyPictures and you want each subfolder

I have IIS 7.5 with static and dynamic compression enabled. It seems to work fine for dynamic files, but for static ones it behaves erratically, often sending a http header "Content-Encoding: gzip" when the content is not compressed. This causes browsers to attempt to uncompress, throwing an invalid magic number error. Here's my configuration: <httpCompression dynamicCompressionDisableCpuUsage="95" dynamicCompressionEnableCpuUsage="70" > <scheme name="gzip" dll="%Windir%\system32\inetsrv\gzip.dll" /> <dynamicTypes> <add mimeType="text/*" enabled="true" /> <add mimeType="application/javascript"

I have an iPhone application that I have developed using ARC. I have a folder that contains a heap of images in my documents directory that I need to zip up and e-mail. My project uses ARC. Does anyone have any example code/links to a resource that would be helpful to me? I've been raking around online and what I can find is not compatible with ARC - even when it claims to be. iPhone Developer Download and drag the Objective-Zip, MiniZip and ZLib drag in to your project from this link http://code.google.com/p/objective-zip/downloads/list (Objective-zip). import the files: ZipFile.h,