Audio file from video file

$ ffmpeg -vn -acodec copy -i infile.avi outfile.mp3

$ mplayer -vo null -dumpaudio video.avi -dumpfile audio.mp3

setup clock in linux

$ sudo emacs /etc/ntp.conf

server time.nist.gov
fudge time.nist.gov stratum 10

$ sudo timeconfig
$ sudo dateconfig

Linux as the WebDAV Server

Linux as the WebDAV Server:

On Linux, use your favorite package manager to install Apache. Most distributions will use Apache httpd 2.0 which has mod_dav built-in, so the only editing of the httpd.conf file needed are the DAVLockDB and Directory definitions. Note that you can also authenticate against Active Directory or LDAP using the mod_auth_kerb or mod_auth_ldap Apache modules. For this example, we’ll stick with using htpasswd:

$ sudo vi /etc/httpd/conf/http.conf
..
DAVLockDB /var/lib/dav/DAVLockDB

DAV On
AuthName "WebDAV Login"
AuthType Basic
AuthUserFile /etc/httpd/.htpasswd

  require valid-user

Order allow,deny
Allow from all

Now create the directories and set permissions:

$ sudo su
# mkdir /usr/local/apache/var
# chown apache:apache /usr/local/apache/var
# mkdir /var/www/html/webdav
# chown www:www /var/www/html/webdav 

Finally, on Linux create the user and password file and restart the httpd daemon:

# htpasswd -m -c /etc/httpd/.htpasswd testuser
New password:
Re-type new password:
Adding password for user testuser
# /sbin/service httpd restart
Stopping httpd:  [ OK ]
Starting httpd:  [ OK ]

Now let’s try it out by connecting some clients!

reference:
http://weblog.bignerdranch.com/?p=18

Linux as the WebDAV Server:

On Linux, use your favorite package manager to install Apache. Most distributions will use Apache httpd 2.0 which has mod_dav built-in, so the only editing of the httpd.conf file needed are the DAVLockDB and Directory definitions. Note that you can also authenticate against Active Directory or LDAP using the mod_auth_kerb or mod_auth_ldap Apache modules. For this example, we’ll stick with using htpasswd:

$ sudo vi /etc/httpd/conf/http.conf
..
DAVLockDB /usr/local/apache/var/DAVLockDB

 DAV On
 AuthName “WebDAV Login”
 AuthType Basic
 AuthUserFile /etc/httpd/.htpasswd
 
   require valid-user
 
 Order allow,deny
 Allow from all

Now create the directories and set permissions:

$ sudo su
# mkdir /usr/local/apache/var
# chown apache:apache /usr/local/apache/var
# mkdir /var/www/html/webdav
# chown www:www /var/www/html/webdav 

Finally, on Linux create the user and password file and restart the httpd daemon:

# htpasswd -m -c /etc/httpd/.htpasswd testuser
New password:
Re-type new password:
Adding password for user testuser
# /sbin/service httpd restart
Stopping httpd:  [ OK ]
Starting httpd:  [ OK ]

Now let’s try it out by connecting some clients!

reference:
http://weblog.bignerdranch.com/?p=18

apache, DocumentRoot must be a directory

You got "DocumentRoot must be a directory" error even it is really a
directory because of SELinux extensions. Run
system-config-securitylevel (or redhat-config-securitylevel) to
disable SELinux for httpd or give SELinux permissions to that
directory:
chcon -R -h -t httpd_sys_content_t /path/to/directory

More help at: http://fedora.redhat.com/docs/selinux-faq-fc3/index.html

reference:
http://www.issociate.de/board/post/186682/DocumentRoot_must_be_a_directory.html