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• Ways to create animations in python ?

  21 mai 2017, par Allison123

  What is the best way to create a small animation in python ?
  So far, I have tried : tkinter and FuncAnimation (from animation in matplotlib- this is what is used in A Student’s Guide to Python for Physical Modeling).

  The goal is to make a set of simple animations, but FuncAnimation is having me install apt-get so that I can get ffmpeg so I can run the animation. It seems like a lot of downloading, which I don’t prefer if there is a similarly powerful alternative.

  If possible, I was hoping to integrate these animations into Pygame at a later time. Will that be possible ?

  YES, this is a subjective question, but I am looking for guidance from experienced python animators. What are the objective strengths and weaknesses of different methods of animating in Python ?

• Debugging Gstreamer pipeline with tee and a filesink in C

  28 septembre 2020, par NicolasBourbaki

  There is an excellent example on how to construct a C program using GStreamer and its tee and filesink elements on https://gist.github.com/crearo/a49a8805857f1237c401be14ba6d3b03.
(Another one can be found on https://gstreamer.freedesktop.org/documentation/tutorials/basic/multithreading-and-pad-availability.html?gi-language=c).

  


  The idea of the tee element in a pipeline is similar like the tee program in Unix : Like a T-shaped tube, it allows to add a bifurcation to a pipeline, which is in my case used to display a video stream to the screen (which works perfectly) and writing it at the same time to a file (which doesn't work - the file is created but stays empty, i.e. has a size of 0 bytes after closing the program).

  


  I deviated from the examples mentioned above by neither having a queue element for recording (because I also don't have one for displaying, which works) as well as neither having an encoder nor a muxer. Although this might be a problem for what gets written to the file in the end, I would expect that there is written something to the file at all.

  


  The program does compile. What additional diagnostics could I run in order to pin down the problem ?

  


• Add VUI parameters to h.264 post encode

  20 septembre 2016, par Dustin Kerstein

  Apparently ffmpeg/libx264 doesn’t add these VUI parameters and this is causing issues with my decoder. Avidemux 2.5 does (2.6 does not) but I would very much like to avoid preparing/re-encoding the hundreds of files.

  The VUI parameters I am looking to add are :

  • max_num_reorder_frames=0
  • bitstream_restriction_flag=1

  Is anyone aware of any tools that could accomplish this without re-encoding ? If this is something that would need to be custom written, where would be a good place to find the right person ?

  Thanks,
  Dustin