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• Bash : bash script to download trimmed mp3 from youtube url

  25 août 2017, par Bhishan Poudel

  I would like to download the initially x seconds trimmed mp3 from a video url of youtube.
  I found that youtube-dl can download the video from youtube to local machine. But, when I looked at the man pages of youtube-dl, I could not find any trim options.

  So I tried to use the ffmpeg to trim downloaded mp3 file.
  Instead of doing this is two steps, I like to write one bash script which does the same thing.
  My attempt is given below.

  However, I was stuck at one place :
  "HOW TO GET THE VARIABLE NAME OF OUTPUT MP3 FILE FROM YOUTUBE-DL ?"
  The script is given below :

  # trim initial x seconds of mp3 file
  
  # e.g. mytrim https://www.youtube.com/watch?v=dD5RgCf1hrI 30
  
  function mytrim() {
  
      youtube-dl --extract-audio --embed-thumbnail --audio-format mp3 -o "%(title)s.%(ext)s" $1
  
      ffmpeg -ss $2 -i $OUTPUT_MP3 -acodec copy -y temp.mp3
  
      mv temp.mp3 $OUTPUT_MP3
  
      }

  How to get the variable value $OUTPUT_MP3 ?
  echo "%(title)s.%(ext)s" gives the verbatim output, does not give the output filename.

  How could we make the script work ?

  The help will be appreciated.

• How to pass the output of one program (ffmpeg) to python script ?

  8 septembre 2017, par Victor Odouard

  What I would like to do is this :

  ffmpeg -i udp://224.10.10.10:15004 -qscale:v 2 sttest%04d.jpg

  And then pass the output image paths of this to a python script, which individually takes in the images and manipulates them, as ffmpeg is running (eventually I will use ffmpy to call ffmpeg rather than using the command line tool, but for now testing purposes, I’m starting here).

  I suppose a way to do this would be to look into the directory of the ffmpeg output every time I’ve processed an image to see if there is a new one, and then load that into python (using OpenCV)—and then waiting a certain time interval if there are no new images to process.

  But is there a better way of doing this, like sending the paths of the images directly to some sort of queue which the python script can then process one by one ?

• makedef : Extend the script for use with mingw tools as well

  24 août 2017, par Martin Storsjö

  makedef : Extend the script for use with mingw tools as well
  This is invoked by setting the NM and AR variables to the names of
  
  those specific tools. The ARCH variable also needs to be provided,
  
  to choose the symbol prefix (nm doesn’t provide any option that
  
  dumps the architecture easily).
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] compat/windows/makedef