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• Golang command working in terminal but not with exec package

  17 août 2016, par Jon Stevens

  I am converting a video generation library from NodeJS to GO that primarily uses FFMPEG for all the video processing. I already have all the FFMPEG commands written out to do the generation I want. The issue is that when I try to run the command through the os/exec package, it fails. However, if I copy the exact command and run it directly in the terminal it works and I cannot figure out why that is. My code that runs the command is below :

  command := "ffmpeg -y -loop 1 -i image.png -vf 'fade=in:0:15,fade=out:105:15' -c:v mpeg2video -t 5 -s 1280x720 -r 30 -q:v 1 -preset ultrafast image.mpg"
  
  
  
  parts := strings.Fields(command)
  
  cmd := exec.Command(parts[0], parts[1:]...)
  
  cmd.Stderr = os.Stderr
  
  cmd.Stdout = os.Stdout
  
  err := cmd.Run()
  
  if err != nil {
  
      panic(err)
  
  }

  The ffmpeg error I get when I try to run this code is :

  [AVFilterGraph @ 0x22a9bc0] No such filter : ’fade=in:0:15,fade=out:105:15’

  Error opening filters !

  2016/08/17 17:48:53 exit status 1

  Like I previously stated, if I copy the EXACT command :

  ffmpeg -y -loop 1 -i image.png -vf 'fade=in:0:15,fade=out:105:15' -c:v mpeg2video -t 5 -s 1280x720 -r 30 -q:v 1 -preset ultrafast image.mpg

  and run it directly in the terminal, it works no problem.

  PLEASE HELP.

• Revision aa70712e4e : vpxenc : fix per-frame psnr/size output on a terminal was previously being wiped

  9 juillet 2014, par James Zern

  Changed Paths :
   Modify /vpxenc.c

  
  
  vpxenc : fix per-frame psnr/size output on a terminal

  was previously being wiped out by the ctrl-K escape

  Change-Id : I87d0de255a174f19e8912a65e519dad99d54a530

• Using Python to make a terminal-based YouTube audio streamer

  11 août 2015, par Tyson Berry

  I want to make a terminal-based program that streams YouTube audio for easy listening to music. I’m aware that I’d have to use a converter like ffmpeg to extract the mp3 audio and an audio player like Foobar2000, I’m just unsure how to make it all work together.

  I have an idea for commands etc which is here. (Excuse my crude use of MS Paint)

  As you can see yap (YouTube Audio Player, a working title) is the command used in front of a YouTube URL to tell the program what video to fetch. It then fetches the title of the video from the YouTube page’s source, which is listed in a text file on the desktop along with the URL. The song is then loaded and played through the audio player which is displayed in the terminal using the song time. When the song has ended, you can see the user has typed list. List opens up the list on the desktop, which displays all the songs previously entered in the program. The user can then select a number and play the corresponding song from the list.

  I have found this, which is outdated yet relevant.