Congratulations to Siddhi for his Django wiki video and getting it listed on the Django weekly round-up:
“Siddharta Govindaraj has recorded an excellent screencast and posted it on ShowMeDo that illustrates how a relatively inexperienced Django programmer can create a basic Wiki application in 20 minutes.”
I have my fingers crossed that we see Part II some time soon!
A usage walkthru (part 5) showing the use of the enhanced interactive shell named IPython.
Divided into five parts, this talk in the series will cover session input filtering using an example of physics units for value representation, and support for data visualization using matplotlib.
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A usage walkthru (part3, part4) showing the use of the enhanced interactive shell named IPython.
Divided into five parts, these talks in the series will cover input and output history caching, viewing and editing Python source and the logging of your session, debugging and profiling your code, then look at executing long-running callables in background threads during your session.
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A usage walkthru (part 1, part 2) showing the use of the enhanced interactive shell named IPython.
Divided into five parts, these talks in the series will cover tab completion, namespace management, logging, the help system and introspection, navigation, system shell commands and the running of Python programs.
Create your own Python videos? You’ll find instructions here for how you can make your own videos in just 30 minutes.
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This is one of 127 videos in our Python tutorial section. Track new-video-announces with our video feed.
In this tutorial, I introduce the basics of Django by walking you through the development of a simple wiki application.
We’ll see how you can design your URLs, interact with the database and use the Django template library. As an added bonus, we’ll also include support for editing pages using Markdown syntax.
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Kirby’s fifth video is Working with Stickworks:
“Here’s a Python module you might want to use in your math classes. It works with VPython to provide simple vector graphics, as well as plotting capabilities. Students wouldn’t just use the module, they’d study the source code to gain a stronger understanding of the math concepts involved (”math through programming”).”
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Kirby’s fourth video is A First Look at RSA:
“Building on some ideas introduced earlier in this series, this easygoing lecture takes a somewhat rambling approach to a rather difficult math topic. This is background for math teachers intending to use Python as a vehicle for exploring math concepts interactively, in a hands-on setting.”
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Most of the instructions needed to compile ffmpeg on RedHat are here and here. This builds upon my previous post Compiling LAME on RedHat.
[Includes update below for libfaac/libfaad]
Following these I first tried:
./configure --disable-debug --disable-network --disable-ffserver --disable-ffplay --enable-libmp3lame --enable-gpl --enable-shared --log=log.txt
but I received the following error:
ffmpeg: error while loading shared libraries: libavformat.so.51: cannot open shared object file: No such file or directory
Note the ‘–log=log.txt’ - a handy way of having the makefile dump out a log file which tells you exactly where things have failed.
For the makefile to see the source and libs for libmp3lame I had to read-up on adding cflags and ldflags to the configure line:
./configure --disable-debug --disable-network --disable-ffserver --disable-ffplay --enable-libmp3lame --enable-gpl --extra-cflags=-I/$HOME/include/ --extra-ldflags=-L/$HOME/lib --prefix=$HOME --enable-shared
Finally it is necessary to export an ‘LD_LIBRARY_PATH’ so that ffmpeg can see the shared libraries for LAME. I chose to add the following to my .bash_profile:
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/$HOME/lib
The final steps are to build ffmpeg:
make
make install
The result is a working ffmpeg that can encode to the FLV format that we use inside ShowMeDo.
Update to enable mp4a (libfaad/libfaac):
Our version of ffmpeg didn’t support libfaac/libfaad for mp4 audio/video support. To fix that first I compiled the libfaac and libfaad libraries, then updated our ffmpeg src:
svn checkout svn://svn.mplayerhq.hu/ffmpeg/trunk ffmpeg
The configuration had to change to include libfaac and libfaad:
./configure --disable-debug --disable-network --disable-ffserver --disable-ffplay --enable-libmp3lame --enable-libfaad --enable-libfaac --enable-gpl --extra-cflags=-I/$HOME/include/ --extra-ldflags=-L/$HOME/lib --prefix=$HOME --enable-shared
make
make install
and next we have a working ffmpeg.
There is one change in usage - previously we had ‘-acodec mp3′ which had to be changed to ‘-acodec libmp3lame’.
Oddly the mp4a stream is recognised as ‘Stream #0.0(eng): Audio: mpeg4aac, 44100 Hz, stereo’ - but it works just fine.
LAME (also known as libmp3lame) is a GPL library for mp3 encoding and decoding. It is used by ffmpeg to generate the FLV files which we use in ShowMeDo.
The follow-on to this article is Compiling ffmpeg on RedHat.
Compiling LAME is fairly straight-forward if your environment is already configured, but that wasn’t as obvious as I’d hoped. I share here the steps I went through to get LAME compiled and installed on a RedHat system.
First you need to run ‘configure’ which builds a makefile specific to your environment:
./configure
but annoyingly I had a failure:
checking build system type... mkdir: cannot create directory `./tmp/cg28625-18078': No such file or directory
config.guess: cannot create a temporary directory in ./tmp
The solution was to make a ‘tmp’ directory in my HOME directory:
mkdir ~/tmp
and export a TMPDIR so that the makefile knew where to find ‘tmp’:
export TMPDIR=~/tmp
After this I added $HOME as the directory for installing the compiled libraries (I already had a ‘bin’ and ‘lib’ in my $HOME):
./configure --prefix=$HOME
Next it was as simple as:
make
make install
and the LAME libraries were installed in my ‘$HOME/lib’ ready for use by ffmpeg.
Kirby’s third video is Subclassing for Beginners in his Python for Math Teachers series:
“Let’s define a simple Dog class and show how we make instances (dogs). Then let’s add a stomach attribute so our dogs can eat and poop (kids love scatology). It’s a dog eat dog world! Then we refactor the code to show how Dog and Monkey classes might both inherit from the Animal class.”
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