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

  23 février 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.

• Apply sound effects on a video file

  31 mars 2013, par talhamalik22

  I am a little miss guided here and it seems i am totally lost. I am developing an android app and its core idea is to develop a video recorder and video player that applies some sound effects on the voice of the people or any sound that it records. Sound effect means that if i make a video of a person who is giving some speech then there should be no effect on video but his/her voice should appear like voice in talking tom cat app. I hope you understand the idea. Similar app is Helium Booth you can check it here. I am trying to use libraries like libSonic, libpd and tried to use XUGGLE too.
  Read somewhere that Xuggle is not really developed for mobile devices so left it. Now what i want is that it should apply this effect on voice on the run time i.e while recording the pitch of the sound should be alterd and saved immediately. And what i am getting with these libraries is that i can apply sound effect after video is recorded. So it means i need to rip the audio from the video and then apply the change in pitch and frequency and again concatenate this audio file with the old video file. And i have no idea how to do it.
  Please show me the right approach and tools if possible.

  Regards

• Remove black bars from DV video using ffmpeg [closed]

  2 juillet 2020, par AustinMaxi1750

  I have copied all my Panasonic DV videos (PAL) from the 1990s to my PC as 'dv avi' using Windows movie maker in the original quality (approx 13GB per hour of video).

  


  At the time the recordings were made I set the Panasonic camera to 16:9. However searching various forums indicates it was an illusion of 16:9 and black bars were superimposed on the 4:3 picture to give a cinematic feel. I have read also that the DV pixels are not square.

  


  As a result all my 16:9 recordings have black bars at the top and bottom when viewed on a 16:9 monitor. The file properties are as follows :

  


  Frame width : 720
Frame height : 576

  


  Is there a code in ffmpeg to remove the black bars ?

  


  I attach an example of what I have :
image with black bars

  


  and an example of what I want to achieve :
image without black bars

  


  I also want to convert the format without loss of quality so I can watch the videos without the black bars on a modern smart TV. My TV cannot play back DV AVI.