New application under FOSSEE-tools to reduce noise from recorded videosNoNoise-1

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+Introduction
+============
+
+With home made videos or screencasts, we often find a constant noise in our recording due to electric wiring, fan, choke coil of fluorescent
+lamp etc. This could be  irritating.But fortunately, these noises can be easily detected and can be removed with GUI based tools, such as 
+Audacity.
+To use any GUI based tool, we need to extract audio manually and then feed it to the software, once done we have to again join the noisefree
+audio with the video. This is OK with 1 or 2 files. But to for automating each step and to handle multiple files we need a simple script.
+
+One can simply use `sox` and `ffmpeg` commands shown below in given order to get the same result(see `Working`).
+
+
+UPDATE for 14.04
+----------------
+
+Install **libav-tools** and **sox**.
+
+Run as ::
+
+	$ bash noNoise.sh noisyVideo.mp4 noise-reduction-factor
+
+This will create an backup file of original video in **/tmp**
+and noisefreeVideo in **pwd**.
+
+Example ::
+
+	$ bash noNoise.sh Kazam_screencast_00000.mp4 0.2
+
+It will create **noisefree_Kazam_screencast_00000.mp4.mp4** in **pwd**
+and a backup of original video in **/tmp/orig_Kazam_screencast_00000.mp4**
+
+This is just an early fix, will add more features soon. 
+
+Please raise issues for any bugs or email me for feature requests. 
+
+Also, I recently came across **Kazam** package (available in repositories),
+its a good screen recorder with most needed keyboard shortcuts, such as
+
+* start recording: Super + Control + r
+* pause recording: Super + Control + p
+* finish recording: Super + Control + f
+* show Kazam: Super + Control + s
+* quit: Super + Control + q
+
+Required packages (Upto Ubuntu 13.10)
+-------------------------------------
+
+ *  sox
+
+ * ffmpeg
+
+ * ffmpeg2theora
+
+ * libmp3lame0
+
+ * Linux machine with default python 
+
+
+
+Usage
+-----
+
+### Remove noise from a single file
+
+    
+      $ python noNoise.py VideoWithNoise.ogv  CleanVideo.ogv
+                            (source file)     (destination file)
+                    
+(OR)
+
+      $ python noNoise.py VideoWithNoise.ogv  CleanVideo.ogv     0.21
+                            (source file)     (destination file) (noise factor)  
+
+   The third argument is optional(Noise factor). The scale spans from 
+   `0.0` to `1.0`. Zero means no noise supression and 1.0 means full. The full
+   scale is avoided. Best optimum result is found between `0.2` to `0.3`. By default
+   script will take `0.26`. One can experiment with noise factor to get best noise
+   free video. 
+   NOTE: Careful, destination file will be overwritten if exist in given path.
+   
+
+
+### Remove noise from all files inside a directory
+
+      
+      $ python noNoise.py allNoisyFiles  allCleanFiles
+                            (source dir)  (destination dir)
+
+(OR)
+                        
+      $ python noNoise.py allNoisyFiles  allCleanFiles      0.21
+                          (source Dir)   (destination dir) (Noise factor)
+
+NOTE: Please don't use any '/' after directory name. It will spit error.
+The fix is possible, but I don't want to spend time on it. This script is dirty
+but useful(atleast for me). When I find time, I will surely modify it. Meanwhile
+you all are welcome to add modifications.
+
+
+
+Working:
+-------
+###1. Extracting video in less compressed format
+
+        ffmpeg -i 1.ogv -sameq -an 2.wmv 
+   
+   Extracting video in wmv format for easy editing(less compressed
+   than mp4,ogv,avi). We can leave the video intact and combine the
+   noiseless audio later to it, but it will hamper the video quality
+   of the newly joined video.
+   The size of this 'wmv' will be approximately 5 times than that of
+   original 'ogv' video.
+   
+
+###2. Extracting audio in less compressed format
+   
+        ffmpeg -i 1.ogv -sameq 2.wav
+   
+   Extracting audio in wav format for fast & easy editing.The size of the
+   `wav` audio file will be approximately 8 times larger than the original.
+
+
+###3. Getting noise profile
+        
+        sox 2.wav -t null /dev/null trim 0 0.5 noiseprof myprofile
+   
+   Creating a noise profile of original audio at 0 to 0.5 second.
+   One can change this duration if required. In most cases the
+   standard noise is evenly distributed throughout the recording(eg: 
+   fan, PC etc), so the default 0 to 0.5 value will do the trick.
+
+###4. Converting audio according to noise profile
+    
+       sox 2.wav 2-noisefree.wav noisered myprofile 0.26
+
+   Creating a noisefree audio based on our noise profile. The value 
+   `0.26` is important. This is scale for noise removal. 0 means no removal
+   and 1 means full removal. The full removal will supress most of the
+   orginal audio too. So as per my R&D, I found `0.26` to be most optimized
+   one for noise removal.
+
+   
+###5. Combining back audio and video
+   
+       ffmpeg -i 2-noisefree.wav -i 2.wmv -sameq vid.wmv
+
+   Merging new noiseless audio and old video together.
+
+
+###6. Final conversion
+       
+       ffmpeg2theora vid.wmv -o vid.ogv
+
+   Now converting wmv into our favorite ogv format. This will create a 
+   `vid.ogv` of almost same size that of original video.
+
+
+License
+-------
+GNU GPLV3