Can't locate Audio/Wav.pm

Error: Can't locate Audio/Wav.pm

Solution: install the missing Audio::Wav dependency module by following command:
sudo cpan Audio::Wav

Resampling audio data

Method1:

Using ch_wav  command

Example: Converting 16 Khz wave file into 8 Khz

ch_wave   -f    16000   -F    8000 -o   wav_8KHz/text001.wav     ../wav_16KHz/text001.wav

Method2:

Using sox command

sox input.wav -r 44000 output.wav resample

Here 44000 is the sampling rate of output file

Example: Converting 16 Khz wave file into 8 Khz

sox   text0001.wav   -r    8000   wav_8KHz/text001.wav   resample

Resampling all files of a directory

write following code in a file suppose down_sample.pl
chomp(@ARGV = <STDIN>) unless @ARGV;
for ( @ARGV )
{
  $was = $_;
  print "was=$was";
  #print "op =$op";

   
 
 $now="./output/".$was;
print "now1=$now\n";
   # @args= ( "ch_wave", "-f", "48000", "-F", "16000", "-o", "$now", "$was");
 @args= ( "sox", "$was", "-r", "16000", "$now", "resample" );
  
                            system(@args);


}

Suppose you are having 48 Khz wav files i directory wav_48khz:

1. Copy the down_sample.pl file having above code into wav_48khz directory

2. Create directory output inside wav_48khz directory

3. Open terminal and go to the wav_48khz directory

4. run following command

    perl down_sample.pl *.wav

5. 16 Khz wav files will be inside output directory

7. You may use either sox or ch_wav command. Some times ch_wav command does not recognise wave files then we should use sox.

How to Install the latest version of Adobe Flash Player in Linux

1. Open a terminal window (press Ctrl + Alt + T) and run the following command:
     

sudo apt-get install flashplugin-installer 

2. When the Flash Player is installed, close the terminal window and restart your browser.

How to upgrade google chrome on linux

 To selectively upgrade Google Chrome, run this command from the terminal:

    sudo apt-get upgrade google-chrome-unstable

How to free caches in ubuntu

How to free caches in ubuntu

sudo sync && sudo sysctl -w vm.drop_caches=3

Unable to run a 32-bit program on 64-bit machine

Qs. I compiled a small "hello world" C program on Ubuntu 10.04 32 bit machine. Then I put the executable(a.out) on Ubuntu 12.10(64 bit) VMWare virtual machine and tried to execute it(./a.out). The OS does not identify the file and says 'No such file or directory'. But when I put the same executable on a Ubuntu 12.10(64 bit) running on a 64 bit laptop, it runs fine and I get the desired output. The VM is running on IBM Blade Servers. I wanted to know why the results for a VM?

Ans:
The message No such file or directory does not refer to your executable file: a.out. Instead it refers to a helper program that's needed to run the 32 bit dynamically linked executable a.out.

Source: http://askubuntu.com/questions/351827/unable-to-run-a-32-bit-program-on-64-bit-vm

PHP is running with user ID=33, but this directory is owned by the system user with ID=0

Error:PHP is running with user ID=33, but this directory is owned by the system user with ID=0

Solution:
 sudo chown -R  www-data:www-data  /var/www/X2Engine/

before changes it was

drwxrwxrwx 3 root root    4096 Mar  4 16:24 X2Engine

--
Pranaw Kumar
C-DAC MUMBAI
Ph-(+91) (22) 26201606

How to enable or activate the apache mod_rewrite module

sudo a2enmod rewrite

then restart apache by

/etc/init.d/apache2 restart

How to change Apache Document root Directory in Ubuntu 13.10

http://www.binarytides.com/install-apache-ubuntu-13-10/

“Adding Printer” dialog asks for root password?

start printer configuration window through command line:

sudo system-config-printer

error while loading shared libraries: libtk8.4.so: cannot open shared object file: No such file or directory

Problem: On some Linux systems, launching oommf.tcl yields an error message of the form

error while loading shared libraries: libtk8.4.so: cannot open shared object file: No such file or directory

Solution: This typically happens because the libtk8.x.so (and libtcl8.x.so) files are installed in a directory not included in the ld.so runtime linker/loader search path. One way to fix this is to add that directory (say /usr/local/lib) to the LD_LIBRARY_PATH environment variable. For example, add

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib

to your ~/.bashrc file (bash shell users) or

setenv LD_LIBRARY_PATH ${LD_LIBRARY_PATH}:/usr/local/lib

to your ~/.cshrc file (csh or tcsh shell users). Another option is to modify the ld.so cache; see the ld.so and ldconfig man pages for details.

source: http://math.nist.gov/oommf/software-patchsets/oommf12a3/