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• How to run ffmpeg as a subprocess and wait for the task to finish (fastapi)

  4 octobre 2023, par leejh

  I'm creating a site that runs ffmpeg on the web using fastapi.

  


  @router.post("/dir/Conver") 
async def ffmpeg_Conversion(request: Request):
    data = await request.json()

    file_path = data.get('file_path')
    saturation = float(data.get('saturation', 1.0))  
    brightness = float(data.get('brightness', 0.0))  
    contrast = float(data.get('contrast', 1.0))
    size = data.get('size','3840x2160')
    bitlayer = data.get('bitlayer',8000)
    codec = data.get('codec','libx264')
    formatstr=data.get('format','MP4')


    savepath = './UserFolder' + file_path

    directory = os.path.dirname(savepath)
    last_directory = os.path.basename(savepath)
    
    last_directory=str(last_directory).split('.')[0]
    print("last_directory : ---------------------" + last_directory)

    current_datetime = datetime.datetime.now()
    formatted_datetime = current_datetime.strftime('%Y-%m-%d-%H-%M-%S-%f')


    ffmpeg_command = [
        'ffmpeg',
        '-i', savepath,
        '-vf', f'eq=saturation={1+saturation/100}:brightness={brightness/100}:contrast={1+contrast/100}',
        '-s', size,
        '-c:v', codec,
        '-preset', 'medium',
        '-b:v', bitlayer,
        directory+'/'+last_directory+"_"+formatted_datetime+"."+formatstr
    ]

    subprocess.check_output(ffmpeg_command, text=True)



  


  Using the code above, I created a function to convert the video.
And this function was given to a button on the web.

  


  FileChan_yes.addEventListener('click', async () => { 
            startRotation();


            const file_path = 'path_to_your_file';  
            const contrastValue = contrastSlider.value;
            const brightnessValue = lightnessSlider.value;
            const saturationValue = saturationSlider.value;

            const Dir=document.getElementById('last_action_link');
            const savepath = Dir.value;

            const codecDropValue = codecDrop.value; 
            const formatDropValue = formatDrop.value;
            const FileSizeDropValue = FileSizeDrop.value;
            const bitDropValue  =   bitDrop.value;


            try {
                const response = await fetch(`/dir/Conver`, {
                    method: 'POST',
                    headers: {
                        'Content-Type': 'application/json'
                    },
                    body: JSON.stringify({
                        file_path: savepath,
                        saturation: saturationValue,
                        brightness: brightnessValue,
                        contrast: contrastValue,
                        size: FileSizeDropValue,
                        bitlayer : bitDropValue,
                        codec : codecDropValue,
                        formatstr : formatDropValue
                    })
                    
                });

                
                if (response.ok) {
                    const result = await response.json();
                    console.log("Conversion successful:", result);
                } else {
                    throw new Error("Failed to convert the file.");
                }

            } catch (error) {
                console.error("Error converting the file:", error);
            } finally {
                stopRotation();
            }
            

        });



  


  When you press the button, first
startRotation() ; the function is executed

  


  When all tasks are completed, the stopRotation() ; function is configured to be executed.

  


  But currently it's not working properly...

  


  stopRotation() ; The function is executed as soon as the button is pressed.

  


  await doesn't seem to work. What is the problem ?

  


• Revision da9db83270 : Revert "Fill buffer speed up" This reverts commit 9b4f9f45eee4d63cef3cd10f24923

  13 juillet 2015, par Jim Bankoski

  Changed Paths :
   Modify /vp9/decoder/vp9_reader.c

  
   Delete /vpx_util/endian_inl.h

  
   Modify /vpx_util/vpx_util.mk

  
  
  Revert "Fill buffer speed up"

  This reverts commit 9b4f9f45eee4d63cef3cd10f24923ed0bdd5ab7b.

  Change-Id : I23545ac8c7464127f7466fc6a58de517874fe0cf

• ffmpeg does not fill in my provided buffer

  14 avril 2018, par thelearner

  I’m trying to pipe a mp4 video to ffmpeg to generate a thumbnail. Unfortunately, ffmpeg does not fill in my provided buffer, even though the whole command execution is successful.

  I’m reading the video from a http request body :

  videoData, err := ioutil.ReadAll(r.Body)

  This is how I push it to ffmpeg :

  log.Print("Creating thumbnail..")
  
  
  
  width := 640
  
  height := 360
  
  log.Print("Size of the video: ", len(videoData))
  
  
  
  
  
  cmd := exec.Command("ffmpeg", "-i", "pipe:0", "-vframes", "1", "-s", fmt.Sprintf("%dx%d", width, height), "-f",  "singlejpeg", "-frame_size", fmt.Sprintf("%d", totalVideoBytes), "-")
  
  
  
  cmd.Stdin = bytes.NewReader(videoData)
  
  
  
  var imageBuffer bytes.Buffer
  
  cmd.Stdout = &imageBuffer
  
  err := cmd.Run()
  
  
  
  if err != nil {
  
      log.Panic("ERROR")
  
  }
  
  
  
  imageBytes := imageBuffer.Bytes()

  This is the error output :

  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7ff05d002600]stream 0, offset 0x5ded : partial file

  pipe:0 : Invalid data found when processing input

  Finishing stream 0:0 without any data written to it.

  frame= 0 fps=0.0 q=0.0
  Lsize= 0kB time=-577014:32:22.77 bitrate= -0.0kbits/s speed=N/A
  video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
  muxing overhead : unknown

  Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)

  Thanks a lot, any help is appreciated.