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• How do i use multiple filters in FFMPEG ?

  20 décembre 2022, par heiko

  I am trying to get the following done with FFMPEG :

  


  

  • Use 2 Filters in FFMPEG

  


  • Run it for all .mp4 files in that folder.

  


  


  Now, the second thing i have already done but for some reason when i am trying to use 2 filters it will only use the first one. The filters should

  


  

  1. Speed up the video

  


  2. Change the Saturation and Brightness

  


  


  I've already tried " ;" "," and " :" to seperate the filters but somehow its not working. Here is the code :

  


  for %%a in ("*.mp4") do ffmpeg -i "%%a" -filter_complex "[0:v]setpts=0.87*PTS[v];[0:a]atempo=1.15[a]" -map "[v]" -map "[a];eq=brightness=0.06:saturation=2" output\%%~na.mp4"


  


• Adding an audio track to a video using it's own audio as a source ?

  29 novembre 2016, par user41997

  I have a video file with the following layout :

  • Video
  • DTS audio

  What I would like to do is :

  • Video
  • AAC audio (converted from the DTS source)
  • DTS audio

  I can’t wrap my head around the FFMPEG command I would need to do this, though, since I would need to convert the DTS audio to AAC and then place it ahead of the DTS track. The reason for this is the PS4 media player currently doesn’t let you select audio tracks and it only plays the first one it sees. It doesn’t support DTS audio but I’d like to keep it around.

• A process' child doesn't get killed from killing the parent process

  2 avril 2022, par Impasse

  I am developing an Electron application. In this application, I am spawning a Python process with a file's path as an argument, and the file itself is then passed to ffmpeg (through the ffmpeg-python module) and then goes through some Tensorflow functions.

  


  I am trying to handle the case in which the user closes the Electron app while the whole background process is going. From my tests though, it seems like ffmpeg's process stays up no matter what. I'm on Windows and I'm looking at the task manager and I'm not sure what's going on : when closing the Electron app's window, sometimes ffmpeg.exe will be a single process, some other times it will stay in an Electron processes group.

  


  I have noticed that if I kill Electron's process through closing the window, the python process will also close once ffmpeg has done its work, so I guess this is half-working. The problem is, ffmpeg is doing intensive stuff and if the user needs to close the window, then the ffmpeg process also NEEDS to be killed. But I can't achieve that in any way.

  


  I have tried a couple things, so I'll paste some code :

  


  main.js

  


  // retrieve video data
ipcMain.handle('get-games', async (event, arg) => {
    const spawn = require('child_process').spawn;
    const pythonProcess = spawn('python', ["./backend/predict_games.py", arg]);

    // sets pythonProcess as a global variable to be accessed when quitting the app
    global.childProcess = pythonProcess;

    return new Promise((resolve, reject) => {
        let result = "";

        pythonProcess.stdout.on('data', async (data) => {
            data = String(data);

            if (data.startsWith("{"))
                result = JSON.parse(data);
        });

        pythonProcess.on('close', () => {
            resolve(result);
        })

        pythonProcess.on('error', (err) => {
            reject(err);
        });
    })
});

app.on('before-quit', function () {
    global.childProcess.kill('SIGINT');
});


  


  predict_games.py (the ffmpeg part)

  


  def convert_video_to_frames(fps, input_file):
    # a few useful directories
    local_dir = os.path.dirname(os.path.abspath(__file__))
    snapshots_dir = fr"{local_dir}/snapshots/{input_file.stem}"

    # creates snapshots folder if it doesn't exist
    Path(snapshots_dir).mkdir(parents=True, exist_ok=True)

print(f"Processing: {Path(fr'{input_file}')}")
try:
    (
        ffmpeg.input(Path(input_file))
        .filter("fps", fps=fps)
        .output(f"{snapshots_dir}/%d.jpg", s="426x240", start_number=0)
        .run(capture_stdout=True, capture_stderr=True)
    )
except ffmpeg.Error as e:
    print("stdout:", e.stdout.decode("utf8"))
    print("stderr:", e.stderr.decode("utf8"))


  


  Does anyone have any clue ?