Some Random Stuff

I got a chance to work on a video encoding application that decodes series of jpeg files and convert them into ogg theora video file. I used the infamous libavcodec library that is used in FFMPEG . I decided to write blog posts explaining how I decode jpeg images and convert them into ogg video file. This is the first part and in this I will explain how to decode jpeg images using libavcodec. To learn how to write decoded images as a ogg video file please read http://random-stuff-mine.blogspot.com/2017/07/encoding-raw-images-to-ogg-theora-video.html Before reading this blog post you must be aware of using and setting up libavcodec. I highly recommend this tutorial to get basics of using libavcodec http://www.ffmpeg.org/doxygen/0.6/api-example_8c-source.html Allocating input format context We will first allocate input format for reading the file. We will use avformat_open_input function that will allocate AVFormatContext structure passed to it , the function detects input typ...

Few years back I wrote a program in C language using Windows API that displays the list of all "Windows" opened on my PC (Windows) and I can make any of them visible/invisible. I decided to share the part of code which Enumerate windows, find a window and make them visible/invisible. Enumerating Windows Windows API provide a function EnumWindows  which takes a pointer to Callback function which it calls for each window found. Second parameter is a LPARAM which you can use to pass any argument you want, this LPARAM will be passed to our callback function. Here is how to use EnumWindows BOOL isSuccess=EnumWindows(OurAppCallback,(LPARAM)userDefinedVariable); Syntax of callback (OurAppCallback) will be like this BOOL CALLBACK OurAppCallback(HWND h,LPARAM l)  Important Remarks about EnumWindows from MSDN:  The EnumWindows function does not enumerate child windows, with the exception of a few top-level windows owned by the system that have the WS_CHILD style....