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• How do websites render custom videos programatically?

  18 July 2020, by Eric Smith

  I've noticed a number of websites such as https://biteable.com, https://animoto.com/apps/online-video-maker, etc. that are essentially online video editors that allow users to apply effects, add custom text, etc. and render a video as a result.

  


  I've done a bit of research but can't find any high-level answers on how these websites accomplish creating videos programmatically. I've seen mention of "FFmpeg", but this seems like it would only be able to accomplish basic tasks such as converting a series of images into a video (am I wrong?).

  


  I know very little about video rendering and was hoping someone had an idea to get me started in my research. Are there libraries that exist that can aid to accomplish what these websites are doing? Or are these websites starting from the ground up with lower-level languages to accomplish this?

  


• Video stream url extract using python

  25 October 2016, by AGR

  I am trying to extract video source url from online video, I have tried selenium and scrapy but I can use these tools to extract any data from the website if we know the exact xpath.

  But some websites they don’t have source url on the page (hidden), I can see that on wireshark traffic or “Video DownloadHelper” chrome addon extracts the source.

  Is there any python lib to extract any streaming video url from online page (like Video downloadhelper)?

  Thanks in advance.

• Calling ffmpeg from subprocess.run and refering to specific directory

  27 December 2018, by Akalyn

  I’m trying to compile images contained in a given directory D into an mp4 video from a python script. I decided to use ffmpeg and hence called it through
  subprocess.run().

  When I issue the following command from another directory than D:

  ffmpeg -framerate 30 -pattern_type glob -i 'path/to/D/*.jpg' -vcodec libx264 -y movie.mp4

  it works fine.

  The same thing happens when I issue the command from the python script with the shell=True option:

  subprocess.run(" ".join(["ffmpeg", "-framerate", "30", "-pattern_type", "glob", "-i", "'path/to/D/*.jpg'", "-vcodec", "libx264", "-y", "movie.mp4"]), shell=True)

  However I know that relying on shell=True is not recommended. I tried using subprocess.run without that option:

  subprocess.run(["ffmpeg", "-framerate", "30", "-pattern_type", "glob", "-i", "'path/to/D/*.jpg'", "-vcodec", "libx264", "-y", "movie.mp4"])

  but it resulted in the following error:

  'path/to/D/*.jpg': No such file or directory.

  ---

  Why does the call to ffmpeg fail when calling it through subprocess.run with shell=False option ?