Upside down skype video on Fedora 14 64bit

Yes that happens on my laptop:

Laptop: Asus K40AB
Web-cam: Chicony CNF7129

It seems Asus mounted the camera upside down in the laptop. The windows driver internally inverts the image and displays it.

Here's a simple trick that I learnt from the ubuntu forums.
If you run skype with:

LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so /usr/bin/skype

It fixes the issue. But running it that way always isn't a fun.

There are two things to fix this situation:

1. The boring way: Create a shortcut on the desktop, with the above line as the executing application. This fixes the issue for only one user and cannot be invoked by the run command.

2. The fun way:
i. Log in to the super user

$ su

Enter the password
ii. Go to /usr/bin

# cd /usr/bin

iii. Rename skype to skype.main

# mv skype skype.main

iv. Create a new file skype with the below content:
LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so /usr/bin/skype.main

# echo "LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so /usr/bin/skype.main" > skype

v. Make the new skype executable

# chmod 755 skype

And you are done. Now running skype will call the above script which has a fix thus the video is displayed correctly.

Still facing an issue? Post a comment.

Update: having issues with LD_PRELOAD, check updated article on my new blog here.

No sound through headphones in Fedora 14

Sometimes there is no audio from the headphones. In that case, open a terminal, run alsamixer, i.e.

$ alsamixer

The alsamixer window is displayed.
Press F6 button and select "HDA ATI SB" from the list of sound cards and press enter.

Check that none of the mixers are mute (MM is shown below them if they are mute). If none are mute and are at high level but still you can hear no sound, go to the Front Mic, press up-arrow key and then the down-arrow key.

This works for me all the time.

Still have a problem, drop a comment.

Installed froyo on my Samsung Galaxy Spica I5700

Just used this video: http://www.youtube.com/watch?v=RnnX-5FU0O8&feature=related
to install Froyo on to my spica. Its working great.

Prime Number in Perl with a twist

Just a few days ago, I learned that all prime numbers > 3 can be represented as multiple of 6 +1 or -1.

So here's a code in perl to find nth prime number.


#!/usr/bin/perl

print "Enter the number: ";
chomp($num = <>);
$i = 3;
$no_of_prime = 3;
$prime = 0;
if ($num == 1)
{
print "1st prime is 2 \n";
}
elsif ($num == 2)
{
print "2nd prime is 3 \n";
}
elsif ($num > 2)
{
$index = 1;
$powindex = 1;
$no_of_prime = 2;
while($no_of_prime < $num)
{
$prime = (6 * $index) + ((-1) ** $powindex);
$j = 2;
$is_prime = 1;
while($j <= ($prime ** 0.5))
{
if(($prime % $j) == 0)
{
$is_prime = 0;
break;
}
$j = $j + 1;
}

if ($is_prime == 1)
{
$no_of_prime++;
}

if(($powindex % 2) == 0)
{
$index = $index + 1;
}

$powindex = $powindex + 1;
}
print $num, "th prime is: ", $prime, "\n";
}
else
{
print "Invalid number\n";
}
#END

USB Tethering SPICA on fedora

I just usb tethered SPICA on fedora 14.

Here's what I did (could be ugly than other tutorial but works)
But before that, the following helped me.

http://code.google.com/p/azilink/
http://androidforums.com/samsung-i7500/19510-adb-linux.html
http://idolinux.blogspot.com/2010/06/usb-tether-android-with-linux.html <-- Better read this site, than the below thing.

Part 1: Install the driver:
1. Create a new file /etc/udev/rules.d/51-android.rules
vi /etc/udev/rules.d/51-android.rules
2. Copy and paste the below line
SUBSYSTEM=="usb", SYSFS{idVendor}=="04e8", MODE="0666"
3. Then in the terminal type:
chmod a+r /etc/udev/rules.d/51-android.rules

Part 2: Install the ADB:
1. Download the Android SDK. It is a .tgz file, extract it.
2. On the terminal go to the extracted folder. It has a sub-folder, tools. Go to tools/
3. Run ./android
4. A GUI comes up, on the left panel select "Avaiable Package".
5. Select "SDK Platform Android 1.5, API 3" from it and click on Install selected. Next Accept the license.
6. Now go to the /platform-tools/
7. Just to test adb is working, try
./adb shell
It should open a shell. That is actually your phone. If it didn't work, try reading the above links. Or try
./adb devices
This will show the device connected.
I got the following:
List of devices attached
5700db4ac5a1 device

My device is a Samsung Spica 5700

Part 3: azilink to tether:
Now install the azilink to your phone. Simply type
./adb install /azilink-2.0.2.apk

Follow the above given blog.

Mount windows shared drive

Here's a command I keep forgetting.
In order to mount a windows shared folder just try this with root access:

mount -t cifs -o username=Windows-username //ip-of-windows/shared-folder-name /mount/point

And you've got it

For passwords:
mount -t cifs -o username=Windows-username,password=password //ip-of-windows/shared-folder-name /mount/point

Here's a wonderful link:
http://opensuse.swerdna.org/susesambacifs.html

64 bit Google Chome with 32bit Flash on Linux

Read here

http://www.hyperborea.org/journal/2009/12/64bit-chrome-flash/