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FFMPEG

Upgrading ffmpeg through 3rd party Slackbuilds.

FFmpeg is a complete, cross-platform solution to record, convert and stream audio and video.
It includes libavcodec - the leading audio/video codec library.  It is always improving with each new
release, so it pays to upgrade.  In this tutorial we are going to achieve 3 things.
1. How to upgrade ffmpeg through 3rd party SlackBuilds.
2. How to edit the SlackBuild to Vectorlinux standards.
3. How to create a package that is worthy of being contributed to the Vectorlinux repository.

This also serves as the first in a 5 part tutorial on installing Kdenlive on Vectorlinux 6.0 Gold.
You can find the part 2 here.
Click the Green Arrow to start.

Exported text from the tutorial.
I'm trying something new and including the exported text from the tutorial.
My hope is that this may do more than just make the content more searchable,
but also encourage some community participation.

 If you are able to translate the dialog to another language or improve it
in any way simply...
1. copy everything below to a text editor.
 2. You can change anything inbetween the '+--->' Markers.
3. Save the text file with your changes and email it to me here

If you wish to comment on the above tutorial. Please do so
here at opensourcebistro.com/blog1
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This is part 1 of a series of tutorials that will eventually lead to building Kdenlive for Vectorlinux 6.0.
It also opens the doors for any other package that has dependencies on a newer ffmpeg.
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Upgrading ffmpeg using a 3rd party SlackBuild.
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Before you go any further you should know that I will be uploading this very ffmpeg upgrade to the testing repositories and you can simply install it via Gslapt if you want.
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However, if you follow this tutorial you will be able to enable some proprietary codecs that I can not enable on a package that gets distributed through the repositories.
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The most recent version of ffmpeg in the repository is actually quite old.
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The source for the 3rd party SlackBuild is connie.slackware.com/~alien/slackbuilds/
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There are a variety of SlackBuilds here. For many of them the steps covered here will work for them as well.
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We of course want the ffmpeg, one.
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'connie.slackware.com' uses a format which puts everything needed in a folder called 'build'
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So we want to make our own folder called 'build'
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Then from inside the 'build' folder open up a terminal.
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Press the 'alt' and 'space bar' at the same time. This will bring up the context menu.
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We want to keep this terminal layered on top.
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The reason for all of this is we are going to download all of these items into our own build folder.
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Copy each of the link addresses...
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Then in the terminal we are going to use wget to do the actual download. (Make sure your internet is connected.)
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Then just press 'Shift' + 'Insert' to paste in the copied link address.
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Your going to need to do this for each item in the 'build' directory.
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Each time pasting the link into a wget command, which will complete the download.
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When you are done you will have each of the files downloaded into your own 'build' directory.
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Now you can run the SlackBuild exactly as it is and end up with an installable .tgz file.
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However, I'm going to show you how to tweak this one for Vectorlinux first.
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Now one good reason to build this yourself is that you can choose to keep the proprietary codecs enabled.
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Proprietary codecs have to be disabled in anything that is packaged for the repositories.
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Now to tweak this for Vector, any thing that references a i486 architecture, must be changed to i586
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Also the 'TAG' for Vectorlinux version 6.0 builds is vl60.
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To save time use the 'Find' function to locate anything else referencing 486.
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You should find two more.  Make sure to change them to i586.
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The last thing you need to change is right near the bottom of the script.
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Everything that reads .tgz needs to be changed to .tlz.
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Once that is done, save your changes and your ready to run the .SlackBuild script.
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Sign in as a root user. SlackBuilds always are run as root.
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Then just start the SlackBuild as shown.
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Then just start the SlackBuild as shown.
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Here's an example of me making a mistake so you don't have too.
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Before running the SlackBuild make sure to install yasm via Gslapt.
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OK, now we can run the .SlackBuild.
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If you do this yourself, be warned this build will run a long time.
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When it's done you won't find the packaged .tlz in the directory above like in our other tutorials.
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Instead you will find them in the /tmp/ directory.
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We don't need to be root to copy this to our home directory so exit out.
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Then just use the copy command to move the file...
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To your home directory, or a place of your choosing.
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Then you just need to install the package and that's it. 
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You know have a newer, fancier, ffmpeg libraries which you can build newer fancier things against.
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You can now go on and check out the tutorial on packaging MLT, the next step on the way to building Kdenlive for Vectorlinux 6.0.
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Bonus Material.
How to complete this so it can be sent up as a package for Vectorlinux 6.0.
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+--->

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There is something missing from the .tlz file that keeps it from being ready for submission as a package.
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In the 'install' directory we should have a file called slack-required.
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+--->

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+--->

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+--->

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So I'm going to show you how to create that file and how to get it into the packaged .tlz.
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We'll start off just by creating an empty file named slack-required.
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+--->

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+--->

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+--->

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+--->

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+--->

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+--->

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+--->

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+--->

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+--->

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+--->

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+--->

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+--->

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+--->

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+--->

+--->
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+--->
Next, open a terminal in the same directory as the packaged .tlz file.
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We are going to use a utility called requiredbuilder to generate a list of the required dependencies.
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Use the options -n -v, this will cause the results to output to the terminal and include version numbers
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+--->
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give the path to the .tlz in question in the last part of the command.
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+--->

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+--->

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+--->

+--->
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+--->
The resulting output is the required dependencies for ffmpeg.  Copy this and paste it into our empty slack-required file.
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+--->
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+--->

+--->
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+--->

+--->
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+--->

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+--->

+--->
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+--->

+--->
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+--->
Of course, save the changes.
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+--->

+--->
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+--->

+--->
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+--->
Now copy the slack-required file into the ''build' folder.
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+--->

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+--->

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+--->

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+--->

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+--->

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+--->

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+--->

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+--->

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+--->

+--->
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+--->
Now, we know the ffmpeg.SlackBuild already has code that will transfer the slack-desc file into the packaged .tlz.
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+--->

+--->
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We are going to find that code and do the same for the slack-required file.
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+--->

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+--->

+--->
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+--->

+--->
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+--->

+--->
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+--->

+--->
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+--->

+--->
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+--->

+--->
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+--->

+--->
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+--->

+--->
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+--->

+--->
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+--->

+--->
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+--->
Now insert a line of code that replaces slack-required where slack-desc was used.
+--->
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+--->
What this line does is copy the slack-required file and put it into a folder called 'install' which is going to be part of the .tlz package.
+--->
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+--->

+--->
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+--->
Save your changes and that's it.
+--->
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+--->

+--->
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+--->

+--->
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+--->

+--->
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+--->

+--->
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+--->

+--->
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+--->

+--->
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+--->

+--->
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+--->

+--->
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+--->
You'll have to run ffmpeg.SlackBuild all over again.
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+--->

+--->
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+--->

+--->
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+--->

+--->
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+--->
But when it is done the 'build' directory along with the ffmpeg.tlz will be ready for uploading to the repository.
+--->
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+--->

+--->
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+--->

+--->
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+--->
Finished

View Again?
+--->
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