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• Python, FFMPEG : Redirecting output of FFMPEG subprocess call to a string

  31 décembre 2019, par user1452030

  I’ve managed to run an FFMPEG command using the subprocess module as shown below :

  output = subprocess.check_output(command, shell=True)

  This works fine, but it prints the verbose FFMPEG output to console. The program I’m writing is supposed to run for hundreds/thousands of files in a batch and I don’t want detailed outputs for every file processed, unless the user chooses to do so. Can I redirect the console outputs and errors to strings, so that I can decide when I should and shouldn’t print them ?

  This might be lame, but I tried the following snippet :

  outputBuffer = BytesIO()
  
  output = subprocess.check_output(command, shell=True, stdout=outputBuffer)

  But it gave me the following error :

  ValueError: stdout argument not allowed, it will be overridden.

  I saw other examples where the POpen interface was used, but given that I’m not communicating with the external command as it is running, and that I need to run this for a large number of items, I’d prefer something simpler, if possible.

  Thanks in advance !

  Note : I’ve found lots of questions in this broad topic, but I couldn’t find anything perfectly relevant to my situation.

• Publish local .mp4 video from android to wowza using FFmpeg

  13 mars 2016, par Parth Doshi

  I am trying to publish a local .mp4 video from my sdcard to wowza using the ffmpeg java wrapper.

  I have used the library for executing ffmpeg commands on Android

  On Android, my code looks as follows :

  FfmpegController objController = new FfmpegController(MainActivity.this, new File("/tmp"));
  
                  //objController.installBinaries(MainActivity.this,true);
  
                  mFfmpegBin = objController.installBinary(MainActivity.this, R.raw.ffmpeg, "ffmpeg", true);
  
                  //no just extract the audio
  
                  ArrayList<string> cmd = new ArrayList<string>();
  
  
  
                  //-f dshow -i video="Integrated Camera" out.mp4
  
                  cmd.add(mFfmpegBin);
  
                  //cmd.add("-sample_fmts");
  
                  cmd.add("-re");
  
                  cmd.add("-i");      
  
                  cmd.add("/sdcard/sample.mp4");
  
                  cmd.add("-c");
  
                  cmd.add("copy");
  
                  cmd.add("-f");
  
                  cmd.add("flv");
  
                  cmd.add("rtsp://192.168.1.35:1936/live/myStream");
  
  
  
                  objController.execFFMPEG(cmd, new ShellUtils.ShellCallback() {
  
  
  
                      @Override
  
                      public void shellOut(String shellLine) {
  
                          // TODO Auto-generated method stub
  
                          System.out.println("shell out" + " "  +shellLine);
  
                      }
  
  
  
                      @Override
  
                      public void processComplete(int exitValue) {
  
                          // TODO Auto-generated method stub
  
                          System.out.println("process complete::" + " " +exitValue);
  
  
  
                      }
  
                  });
  
  
  
              }catch(Exception ex){
  
                  ex.printStackTrace();
  
              }
  
          }
  
  </string></string>

  Now, when I execute the command, I get the following logs

  shell out Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/sdcard/sample.mp4':
  
  shell out rtmp://192.168.1.35:1936/live/myStream: Protocol not found

  Why is the protocol not supported on Android. When I run the same ffmpeg command from windows command line using ffmpeg then it works fine.

  The command is,

  ffmpeg -re -i sample.mp4 -c copy -f flv rtmp ://192.168.1.35:1936/live/myStream

  Can please someone help ?

• ffmpeg multiple input video in grid and simultaneous audio

  13 février 2023, par Hnusny Pleb

  i would like to copy a video into n videos in one grid :
best example : https://www.youtube.com/watch?v=lYKDTLGH-TQ&ab_channel=TheRabbit_123

  


  This is my code, its working, but problem is, the audio seems to be like its played by one version.. I want the "echo" thats created by a lot of files like on the video above.

  


  def create_4_in_one(number):
shutil.copy("start.mp4", f"video.mp4")
for i in range(number):
    shutil.copy("video.mp4", f"temp_videa/{i}.mp4")
    subprocess.call(f'ffmpeg -y -i video.mp4 -vf "scale=iw/2:ih/2" -c:a copy video_half.mp4',
                  shell=True)
    subprocess.call(f'ffmpeg -y -i video_half.mp4 -i video_half.mp4 -i video_half.mp4 -i video_half.mp4 -filter_complex "[0:v][1:v]hstack[t];[2:v][3:v]hstack[b];[t][b]vstack[v]; [0:a][1:a][2:a][3:a]amerge=inputs=4[a]" -map "[v]" -map "[a]" -map 0:a -map 1:a -map 2:a -map 3:a -c:a aac -b:a 128k -ac 2 -shortest output.mp4',
                  shell=True)
    os.remove("video.mp4")
    os.remove("video_half.mp4")
    os.rename('output.mp4', 'video.mp4')

os.remove("video.mp4")


  


  Thanks in advance.