[Solved] Ubuntu can not use webcam for video call, while Cheese is working properly

This post is not for people who is facing Linux webcam driver issue, it is for people who can get webcam working (with some application, such as Cheese) but webcam is not working for video calling like Skype or Google video call.

I also don't know the cause but for solution is to set this to environment variable before running video call application

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

For convenient, you can rename the original application bin file to other name and making below script naming as bin file.

For example, I did rename my /usr/bin/google-chrome to /usr/bin/google-chrome.real and create a script at /usr/bin/google-chrome with below content

#!/bin/sh
LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so /usr/bin/google-chrome.real

Now Gmail video call on my Google Chrome should work. (Skype also can do the same way)

Tested with Ubuntu 10.04 on 32-bits machine.
Credited to some forums in internet. Sorry for forgotten.

[VIM] config per file type

add to your .vimrc

autocmd FileType [type] setlocal [configs...]

[Git] Rebase

So far I have used git rebase for 3 scenarios.

1. Want to add more change in the commit that is not the last commit of any branch. Use git rebase -i
2. Want to move whole different branch to base on another branch.
   

         A---B---C topic
        /
   D---E---F---G master

   to
   

                 A'--B'--C' topic
                /
   D---E---F---G master

   git checkout <branch-to-move>
   git rebase <base-branch>

3. Want to move part of different branch to base on another branch.

       o---o---o---o---o  master
           \
            o---o---o---o---o  next
                             \
                              o---o---o  topic

   to
   

   o---o---o---o---o  master
       |            \
       |             o'--o'--o'  topic
       \
        o---o---o---o---o  next

   git rebase --onto <new-base-branch> <old-base-branch> <move-branch>
   
   
   

[Git] delete/remove remote tag

To delete/remove remote branch in Git, you use

git push <remote*> :<branch-to-remove>

Also to delete/remove tag in remote server, you can use

git push <remote> :refs/tags/<tag-to-remote>

These commands might seem weird and hard to remember. To be able to remember them easier, I suggest you to see this full git push command

git push <remote> <local-branch-name>:<remote-branch-name>

Then to delete is to push empty branch to expected branch on remote. That's all why.


 *remote is an alias of other repository see git remote
Credit: How to: Delete a remote Git tag

==

Update
The current version of git now support argument --delete for push. So now you can delete branch hello from origin with this command

git push --delete origin hello

[Git] Ignore change of a file that is in an index

There is a command git update-index --assume-unchanged <file> for ignore.
And there is a command git update-index --no-assume-unchanged <file> for unignore.

For listing assume-unchanged files use git ls-files -v and see lower h in front of file name.
You can combine this with grep "h ". And you can also use git ls-files -v if you are interesting only a file.

[Git] partially add some changes in a file to index

- Use git add -i (<filename>)
- Select 5 (or p) then enter to see changes for selection.
- Choose files by type number in front of each file name and enter.
- Enter again to start.
- Type y or n to choose or not choose changes.
  Type s to divide changes to smaller sectioin.
  Type e to manually choose change.
- After back to main prompt choose 7 (or q) and enter to leave.

Ant OS specific value

<condition property="os.dep.value" value="value for MacOSX">
  <os family="mac" />
</condition>

<condition property="os.dep.value" value="value for Windows">
  <os family="windows" />
</condition>

<condition property="os.dep.value" value="value for Unix" >
  <os family="unix" />
</condition>

Use as "${os.dep.value}"

Creadit: Can I make the Ant copy task OS-specific? - Stack Overflow, How to make a conditional decision in an Ant build script based on operating system | java ant | devdaily.com