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• Getting the "Invalid data found when processing input" error when I try to convert a raw pcm file to mp3 ?

  10 août 2023, par Jiron

  I tried to convert a file from pcm into mp3 with ffmpeg and the npm package fluent-ffmpeg. This is my code :

  


  const ffmpeg = require('fluent-ffmpeg');

function convert(input, output, callback) {
    ffmpeg(input)
        .output(output)
        .on('end', function() {                    
            console.log('conversion ended');
            callback(null);
        }).on('error', function(err){
           console.log('error: ' + err);
           callback(err);
        }).run();
   }

   convert('./test.pcm', './converted.mp3', function(err){
   if(!err) {
      console.log('conversion complete');
   }
});


  


  But every time I execute the script, I get this error :

  


  error: Error: ffmpeg exited with code 1: ./test.pcm: Invalid data found when processing input


  


  When I tired running :

  


  ffmpeg -f s16le -ar 48k -ac 2 -i test.pcm converted.mp3


  


  Everything worked though. Is there something wrong with the npm package ? Is there something I missed out or something I did wrong on my code ?

  


  Edit :

  


  My code works when I try to convert an mp3 to a wav file (for example). So it's only struggling with pcm files.

  


• Live stream is gets delayed while processing frame in opencv + python

  18 mars 2021, par Himanshu sharma

  I capture and process an IP camera RTSP stream in a OpenCV 4.4.0.46 on Ubuntu.
Unfortunately the processing takes quite a lot of time, roughly 0.2s per frame, and the stream quickly gets delayed.
Video file have to save for 5 min but by this delaying video file is saved for 3-4 min only.

  


  Can we process faster to overcome delays ?

  


  I have two IP camera which have two diffrent fps_rate(Camera 1 have 18000 and camera 2 have 20 fps)

  


  I am implementing this code in difference Ubuntu PCs

  


  

  • Python 3.8.5 (default, Jul 28 2020, 12:59:40) [GCC 9.3.0] on linux

  


  • Django==3.1.2

  


  • Ubuntu = 18.04 and 20.04

  


  • opencv-contrib-python==4.4.0.46

  


  • opencv-python==4.4.0.46

  


  


  input_stream = 'rtsp://'+username+':'+password+'@'+ip+'/user='+username+'_password='+password+'_channel=0channel_number_stream=0.sdp'
input_stream---> rtsp://admin:Admin123@192.168.1.208/user=admin_password=Admin123_channel=0channel_number_stream=0.sdp

input_stream---> rtsp://Admin:@192.168.1.209/user=Admin_password=_channel=0channel_number_stream=0.sdp

vs = cv2.VideoCapture(input_stream)
fps_rate = int(vs.get(cv2.CAP_PROP_FPS))
I have two IP camera which have two diffrent fps_rate(Camera 1 have 18000 and camera 2 have 20 fps)

video_file_name = 0
start_time = time.time()
while(True):
    ret, frame = vs.read()
    time.sleep(0.2)     # <= Simulate processing time (mask detection, face detection and many detection is hapning)


    ###  Start of  writing a video to disk          
    minute = 5  ## saving a file for 5 minute only then saving another file for 5 min
    second  = 60
    minite_to_save_video = int(minute) * int(second)


    # if we are supposed to be writing a video to disk, initialize
    if time.time() - start_time >= minite_to_save_video or  video_file_name == 0 :
        ## where H = heigth, W = width, C = channel 
        H, W, C = frame.shape
        
        print('time.time()-->',time.time(),'video_file_name-->', video_file_name,  ' #####')
        start_time = time.time()

        video_file_name = str(time.mktime(datetime.datetime.now().timetuple())).replace('.0', '')
        output_save_directory = output_stream+str(int(video_file_name))+'.mp4'


        fourcc = cv2.VideoWriter_fourcc(*'avc1')
        
        writer = cv2.VideoWriter(output_save_directory, fourcc,20.0,(W, H), True)

    # check to see if we should write the frame to disk
    if writer is not None:
        
        try:
            writer.write(frame)

        except Exception as e:
            print('Error in writing video output---> ', e)


  


• FFmpeg does not exit even though processing has finished

  23 mars 2021, par LTR

  I'm starting ffmpeg.exe from C# on Windows. Then I send some frames for encoding via the stdin stream. When all frames have been sent, I close the stdin stream. This tells FFmpeg to exit. I have used this method in other projects before, and it has always worked before.

  


  In this case, it doesn't work. FFmpeg realizes the standard input stream has been closed, and finishes the output file. But then, the ffmpeg.exe process just remains open without exiting.

  


  What's wrong here ?

  


      [TestMethod]
    public void FfmpegNotReacting()
    {
        Size frameSize = new Size(854, 480);
        

        var ffmpegProcess = new Process();
        ffmpegProcess.StartInfo
             = new ProcessStartInfo("ffmpeg_64.exe")
             {
                 Arguments = $"-loglevel verbose -report -f rawvideo -vcodec rawvideo -pixel_format rgb32 -video_size {frameSize.Width}x{frameSize.Height} -r 30 -i pipe:0 -c:v libx264 -vf format=yuv420p -preset medium -y -crf 18 output.mp4",
                 RedirectStandardError = true,
                 RedirectStandardInput = true,
                 RedirectStandardOutput = true,
                 CreateNoWindow = true,
                 UseShellExecute = false
             };
        ffmpegProcess.Start();

        // Just add one empty frame
        int bytesPerFrame = frameSize.Width * frameSize.Height * 4;
        ffmpegProcess.StandardInput.BaseStream.Write(new byte[bytesPerFrame], 0, bytesPerFrame);

        ffmpegProcess.StandardInput.BaseStream.Close();

        ffmpegProcess.WaitForExit();

    }


  


  According to How to stop ffmpeg process after it has finished processing in C# ? ShellExecute=true might fix the problem. However, I can't do that here because I need ShellExecute in order to redirect StdInput.

  


  Here's the last couple of lines from the ffmpeg output (with some irrelevant messages removed) :

  


  [output stream 0:0 @ 000002632cf844c0] EOF on sink link output stream 0:0:default.
No more output streams to write to, finishing.
[libx264 @ 000002632cf79c20] frame=   0 QP=9.00 NAL=3 Slice:I Poc:0   I:1620 P:0    SKIP:0    size=125 bytes
frame=    1 fps=0.0 q=24.0 Lsize=       2kB time=00:00:00.03 bitrate= 387.4kbits/s speed=3.33x    
video:1kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 98.280098%
Input file #0 (pipe:0):
  Input stream #0:0 (video): 1 packets read (1639680 bytes); 1 frames decoded; 
  Total: 1 packets (1639680 bytes) demuxed
Output file #0 (output.mp4):
  Output stream #0:0 (video): 1 frames encoded; 1 packets muxed (814 bytes); 
  Total: 1 packets (814 bytes) muxed
1 frames successfully decoded, 0 decoding errors