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• How Many Default Languages ?

  26 janvier 2012, par Multimedia Mike — Programming

  I was thinking back to my childhood, when my family first owned a computer. It was an MS-DOS-powered IBM PC. The default OS came with 2 programming environments, such as they were : GW-BASIC and batch files. It was a start, I suppose. I guess most any microcomputer you can name from that era came with some kind of BASIC interpreter. That defined the computer’s “out of the box” programmability.

  Then I started wondering how this compares to computers (operating systems/distributions, really) these days. So I installed a fresh version of the latest Ubuntu Linux version (11.10 as of this writing ; x86_32) and looked for programmability (without installing anything else). This is what I came up with :

  1. gcc/C (only the C compiler ; other components of the GNU compiler collection are installed separately)
  2. Perl
  3. Python
  4. C#, as furnished by Mono
  5. Bash — can’t forget about the shell as a full-featured programming language (sh is also present, but not t/csh)
  6. JavaScript — since Firefox is installed per default, JS counts
  7. GNU Assember — thanks to Reimar for the reminder that if gcc is present, gas necessarily needs to be there as well

  I checked on C++, Objective C, Java, Ada, Fortran, Go, Lua, Ruby, Tcl, PHP, R and other languages I could think of, but the above items were the only ones present by default. At the same time, I checked my Mac OS X (10.6) box and it also has Ruby and PHP installed. It has a bunch of other languages, courtesy of Xcode, so I can’t certify anything about its out of the box programmability.

  Still, I think “embarrassment of riches” pretty well sums it up. I try not to be crotchety old fogey complaining that kids these days don’t know how good they have it ; rather, I’m genuinely excited for anyone who wants to leap into computer programming in this day and age.

• script ubuntu lucid : x264

  4 mars 2012

  Dans le log du script d’installation j’ai cette erreur :

  Téléchargement, compilation et installation de x264

  1. Initialized empty Git repository in /usr/local/src/x264/.git/
  2. Package x264 was not found in the pkg-config search path.
  3. Perhaps you should add the directory containing `x264.pc’
  4. to the PKG_CONFIG_PATH environment variable
  5. No package ’x264’ found

  Télécharger

  si je tape "echo $PKG_CONFIG_PATH" j’ai une ligne vide

  je suppose que la suite est en rapport :

  1. Makefile :3 : config.mak : Aucun fichier ou dossier de ce type
  2. cat : config.h : Aucun fichier ou dossier de ce type
  3. ./configure
  4. Found yasm 0.8.0.2194
  5. Minimum version is yasm-1.0.0
  6. If you really want to compile without asm, configure with —disable-asm.
  7. make : *** [config.mak] Erreur 1
  8. Found yasm 0.8.0.2194
  9. Minimum version is yasm-1.0.0
  10. If you really want to compile without asm, configure with —disable-asm.

  Télécharger

• Using ffmpeg with Python3 subprocess to convert multiple PNGs to a video

  17 décembre 2016, par ylnor

  I am using Python3, subprocess and ffmpeg to convert multiple PNG images into a single video.

  I have 400 PNG numbered as "00001.png".

  This call for one single specific image to a a one-frame-video works :

  subprocess.call(["ffmpeg","-y","-r","24","-i", "00300.png","-vcodec","mpeg4", "-qscale","5", "-r", "24", "video.mp4"])

  However, when I try some methods seen online for calling all of my images formated as "#####.png" using "%05d.png" as below, it does not work anymore :

  subprocess.call(["ffmpeg","-y","-r","24","-i", "%05d.png","-vcodec","mpeg4", "-qscale","5", "-r", "24", "video.mp4"])

  I receive the error : "%05d.png: No such file or directory".

  I have the feelling that the above syntax is proper to Python2 and not working on my python3 but can’t find the correct python3 syntax anywhere.

  Thanks in advance for your help