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• python - tqdm progress bar on ffmpeg process with avs pipe

  9 octobre 2019, par MeSo2

  I am trying to implement a tqdm progress bar, but have no idea on how to do this when calling ffmpeg with check_output. (Most of the commands are set inside the avs file.)

  from subprocess import check_output
  
  check_output("ffmpeg -i \"temp_AVS.avs\" -c:v libx264 -b:v 25M -c:a aac 1.mp4", shell=True) 

  I cam across this Can ffmpeg show a progress bar ? but nothing hints on how to best implement it with my code.

  I also found this related post How to link the ffmpeg transcoding process information into a vb6 GUI app ?, and it look like I just need to call for the ffmpeg output. But I am note sure how to do that.

• System.Diagnostics.Process pipe (vertical bar) not accepted as argument

  28 septembre 2019, par emp

  I’m trying to execute this code using System.Diagnostics.Process. It works fine in command line. But in C# it’s failing on the | character.

  var myProcess = new Process();
  
  var p = new ProcessStartInfo();
  
  
  
  var sArgs = " -i emp.mp3 -f wav - | neroAacEnc -ignorelength -q 0.5 -if - -of emp.mp4";
  
  p.FileName = "ffmpeg.exe";
  
  p.CreateNoWindow = false;
  
  p.RedirectStandardOutput = false;
  
  p.UseShellExecute = false;
  
  p.Arguments = sArgs;
  
  
  
  myProcess.StartInfo = p;
  
  
  
  myProcess.Start();
  
  myProcess.WaitForExit();

  It gives the following error :

  Unable to find a suitable output format for ’|’ : Invalid argument

  I’ve looked around on stackoverflow and found the following hint but it is also not working :

  var psi = new ProcessStartInfo("ffmpeg.exe");
  
  psi.Arguments = 
  
      "\"-i emp.mp3 -f wav -\" | \"neroAacEnc -ignorelength -q 0.5 -if - -of emp.mp4\"";
  
  psi.CreateNoWindow = false;
  
  psi.UseShellExecute = false;
  
  
  
  var process = new Process { StartInfo = psi };
  
  
  
  process.Start();
  
  process.WaitForExit();

  gives the following error :

  Unrecognized option ’i emp.mp3 -f wav -’
  Failed to set value ’|’ for option ’i emp.mp3 -f wav -’

• exec ffmpeg stdout pipe stalling

  28 septembre 2019, par haxmat

  I’ve been trying to get the exec stdoutpipe from ffmpeg and write it into a different file. However, it stalls and doesn’t finish executing the command.

  package main
  
  
  
  import (
  
      "bytes"
  
      "io"
  
      "io/ioutil"
  
      "log"
  
      "os"
  
      "os/exec"
  
  )
  
  
  
  func stdinfill(stdin io.WriteCloser) {
  
      fi, err := ioutil.ReadFile("music.ogg")
  
      if err != nil {
  
          log.Fatal(err)
  
      }
  
      io.Copy(stdin, bytes.NewReader(fi))
  
  }
  
  
  
  func main() {
  
      runcommand()
  
  }
  
  
  
  func runcommand() {
  
  
  
      cmd := exec.Command("ffmpeg", "-i", "pipe:0", "-f", "mp3", "pipe:1")
  
      stdin, err := cmd.StdinPipe()
  
      if err != nil {
  
          log.Fatal(err)
  
      }
  
  
  
      stdout, err := cmd.StdoutPipe()
  
      if err != nil {
  
          log.Fatal(err)
  
      }
  
  
  
      cmd.Stderr = os.Stderr
  
  
  
      err = cmd.Start()
  
      if err != nil {
  
          log.Fatal(err)
  
      }
  
  
  
      stdinfill(stdin)
  
  
  
      fo, err := os.Create("output.mp3")
  
      if err != nil {
  
          log.Fatal(err)
  
      }
  
      io.Copy(fo, stdout)
  
  
  
      defer fo.Close()
  
  
  
      err = cmd.Wait()
  
      if err != nil {
  
          log.Fatal(err)
  
      }
  
  
  
  }

  does anyone have any ideas ? It starts running ffmpeg but just stalls.