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• Getting "unable to decode APP fields" while playing USB webcam stream through ffplay

  14 mai 2024, par Syed

  I am trying to play USB Webcam stream(not sure in which format it is..) using ffplay in windows. I can see the video without any issue, But I am keep getting below error in console.

  



  


  ffplay.exe -f dshow -i video="Logitech HD Webcam C615" -loglevel debug

  


  



  [mjpeg @97a118cc80] unable to decode APP fields : Invalid data found when processing input
check logs for more details

  



  Do I really need to worry about this error ? Or any filter that I need to provide in command to get ride of this error .

  



  Note : I tried to save stream to a file using ffmpeg getting the same issue.

  



  Thanks in advance.

  


• JavaCV Fetch RTSP Meet "avcodec_open2() error -40 : Could not open audio codec" Error

  6 avril 2019, par Jeremy Lu

  I am trying to use javacv to fetch a rtsp monitoring camera and grabber the frames, but meet "avcodec_open2() error -40 : Could not open audio codec" error when the grabber is prepare to start after setup the parameters.

  Javacv version :

  • org.bytedeco.javacv-platform, 1.4.1
  • org.bytedeco.javacpp-presets.opencv-platform, 3.4.1-1.4.1

  Here is the Jave Exception Infomation :

  org.bytedeco.javacv.FrameGrabber$Exception: avcodec_open2() error -40: Could not open audio codec.  
  
    at org.bytedeco.javacv.FFmpegFrameGrabber.startUnsafe(FFmpegFrameGrabber.java:835) ~[javacv-1.4.1.jar:1.4.1]  
  
    at org.bytedeco.javacv.FFmpegFrameGrabber.start(FFmpegFrameGrabber.java:663) ~[javacv-1.4.1.jar:1.4.1]  

  rtsp infomation :
  For the rtsp source, I also tried to download the FFplay and use command

  .\ffplay.exe -rtsp_transport tcp rtsp://admin:DWUUUP@10.193.8.71

  to show the frames from monitoring camera, and it works, and with following information

  • Input #0, rtsp, from ’rtsp ://admin:DWUUUP@10.193.8.71’ :

    • Metadata :
      • title : Media Presentation
    • Duration : N/A, start : 0.000000, bitrate : N/A
      • Stream #0:0 : Video : h264 (Main), yuvj420p(pc, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 15 fps, 24.17 tbr, 90k tbn, 30 tbc
      • Stream #0:1 : Audio : aac, 16000 Hz, 1 channels, fltp

  • [aac @ 000001fc123be880] Audio object type 0 is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.

  And here is the source code :

  FFmpegFrameGrabber grabber = new FFmpegFrameGrabber ("rtsp://admin:DWUUUP@10.193.8.71");
  
  grabber.setImageHeight(640);
  
  grabber.setImageWidth(360);
  
  grabber.setOption("rtsp_transport", "tcp");
  
  grabber.start(); // Where meet the problem
  
  
  
  Java2DFrameConverter converter = new Java2DFrameConverter();
  
  BufferedImage bufferedImage = converter.convert( grabber.grab() );
  
  ByteArrayOutputStream bateArrayOutputStream = new ByteArrayOutputStream();
  
  ImageIO.write(bufferedImage, "jpeg", bateArrayOutputStream);
  
  byte[] data = bateArrayOutputStream.toByteArray();
  
  bateArrayOutputStream.close();

  I have tested to change the rtsp to a mp4 file, the code can work.

  How can I fix this problem ? Thanks very much !

• How to fix "moov atom not found" error in ffmpeg ?

  21 mai, par user10664722

  Well, I'm using this project to create a Telegram bot which receives URL of .mp4 files, downloads them on server and uploads them to Telegram.

  


  Issue

  


  Everything works fine so far, except converting certain .mp4 files.

  


  For example if I use a sample .mp4 video from https://sample-videos.com/. Then it works fine and converts it successfully.

  


  But if I use a video from some random website which is also simple .mp4 file, it doesn't work and throws this error :

  


  


  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x1932420] Format mov,mp4,m4a,3gp,3g2,mj2 detected only with low score of 1, misdetection possible !
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x1932420] moov atom not found
data/720P_1500K_210306701.mp4 : Invalid data found when processing input