compression

Avoid Video Compression when Selecting Movie with UIImagePickerController?

由 不想你离开。 提交于 2019-11-26 22:57:36
问题 I'm using UIImagePickerController to allow my user to select a video from the asset library. When the user selects the "Choose" button on the second screen, the view displays a progress bar and a "Compressing Video..." message. Why is this happening? Is there some way I can avoid this compression operation? 回答1: Answer: There is currently no way to control how UIImagePickerController compresses the picked video. I just did some quick tests. Using a test app I created, I picked the same video

Can gzip compression be selectively disabled in ASP.NET/IIS 7?

由 纵然是瞬间 提交于 2019-11-26 22:41:02
问题 I am using a long-lived asynchronous HTTP connection to send progress updates to a client via AJAX. When compression is enabled, the updates are not received in discrete chunks (for obvious reasons). Disabling compression (by adding a <urlCompression> element to <system.webServier> ) does solve the problem: <urlCompression doStaticCompression="true" doDynamicCompression="false" /> However, this disables compression site-wide. I would like to preserve compression for every other controller and

How can I tell if my server is serving GZipped content?

由 夙愿已清 提交于 2019-11-26 22:29:30
问题 I have a webapp on a NGinx server. I set gzip on in the conf file and now I'm trying to see if it works. YSlow says it's not, but 5 out of 6 websites that do the test say it is. How can I get a definite answer on this and why is there a difference in the results? 回答1: It looks like one possible answer is, unsurprisingly, curl: $ curl http://example.com/ --silent --write-out "%{size_download}\n" --output /dev/null 31032 $ curl http://example.com/ --silent -H "Accept-Encoding: gzip,deflate" -

python: read lines from compressed text files

由 不问归期 提交于 2019-11-26 22:26:27
Is it easy to read a line from a gz-compressed text file using python without extracting the file completely? I have a text.gz file which is aroud 200mb. When I extract it, it becomes 7.4gb. And this is not the only file I have to read. For the total process, I have to read 10 files. Although this will be a sequential job, I think it will a smart thing to do it without extarcting the whole information. I do not even know that it is possible. How can it be done using python? I need to read a text file line-by-line. Have you tried using gzip.GzipFile ? Arguments are similar to open . Using gzip

Zip support in Apache Spark

由 [亡魂溺海] 提交于 2019-11-26 22:24:36
问题 I have read about Spark 's support for gzip -kind input files here, and I wonder if the same support exists for different kind of compressed files, such as .zip files. So far I have tried computing a file compressed under a zip file, but Spark seems unable to read its contents successfully. I have taken a look to Hadoop 's newAPIHadoopFile and newAPIHadoopRDD , but so far I have not been able to get anything working. In addition, Spark supports creating a partition for every file under a

Python unzipping stream of bytes?

由 风流意气都作罢 提交于 2019-11-26 22:08:32
Here is the situation: I get gzipped xml documents from Amazon S3 import boto from boto.s3.connection import S3Connection from boto.s3.key import Key conn = S3Connection('access Id', 'secret access key') b = conn.get_bucket('mydev.myorg') k = Key(b) k.key('documents/document.xml.gz') I read them in file as import gzip f = open('/tmp/p', 'w') k.get_file(f) f.close() r = gzip.open('/tmp/p', 'rb') file_content = r.read() r.close() Question How can I unzip the streams directly and read the contents? I do not want to create temp files, they don't look good. Yes, you can use the zlib module to

Python image library (PIL), how to compress image into desired file size?

由 僤鯓⒐⒋嵵緔 提交于 2019-11-26 21:49:47
问题 I got a requirement to compress any uploaded images less than 500kb in file size, I have searched on google and all I can see is: >>> foo = foo.resize((160,300),Image.ANTIALIAS) >>> foo.save("path\\to\\save\\image_scaled.jpg",quality=95) If I go with this approach I will have to check if the image is less than 500kb after compress, if not then go for lower quality and size. Is there a better way to do it? 回答1: JPEG compression is not predictable beforehand. The method you described, compress

Is there a way to 'compress' an lm() object for later prediction?

由 邮差的信 提交于 2019-11-26 21:34:45
问题 Is there a way to 'compress' an object of class lm, so that I can save it to the disk and load it up later for use with predict.lm? I have an lm object that ends up being ~142mb upon saving, and I have a hard time believing that predict.lm needs all of the original observations / fitted values / residuals etc. to make a linear prediction. Can I remove information so that the saved model is smaller? I have tried setting some of the variables (fitted.values, residuals, etc.) to NA, but it seems

How to read data from a zip file without having to unzip the entire file

由 ＊爱你＆永不变心＊ 提交于 2019-11-26 21:34:14
Is there anyway in .Net (C#) to extract data from a zip file without decompressing the complete file? Simply I possibly want to extract data (file) from the start of a zip file, obviously this depends if the compression algorithm compress the file in a deterministic order. DotNetZip is your friend here. As easy as: using (ZipFile zip = ZipFile.Read(ExistingZipFile)) { ZipEntry e = zip["MyReport.doc"]; e.Extract(OutputStream); } (you can also extract to a file or other destinations). Reading the zip file's table of contents is as easy as: using (ZipFile zip = ZipFile.Read(ExistingZipFile)) {

Fast Video Compression on Android

由 这一生的挚爱 提交于 2019-11-26 20:57:29
I want to upload video files to server and compress before uploading. I'm using ffmpeg libx264. I have seen viber can upload 30 second video file of size 78MB within a minute [reduce it's down to 2.3MB]. I want to know how do they do it so fast? What I have tried so far - FFMPEG version : n2.4.2 Built with gcc 4.8 Build Configuraiton : --target-os=linux --cross-prefix=/home/sb/Source-Code/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/sb/Source-Code/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable
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