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• FileNotFoundError : [WinError 2] The system cannot find the file specified (using ffmpeg.probe())

  28 octobre 2022, par Hjalti Geir Ágústsson

  I'm trying to access metadata for a video using ffmpeg.probe() and it gives this error message. There is very little info on probe online.

  


  import os
import ffmpeg


os.chdir('E:/F/Salvaged goods/Videos/Miro/Kvikmyndir/Blade_Runner_2049.1080p.WEB-DL.H264.AC3-EVO')

pprint(ffmpeg.probe(filename='Blade_Runner_2049.1080p.WEB-DL.H264.AC3-EVO.mkv', cmd='ffprobe'))



  


  I have also tried this, and got the same error message :

  


  pprint(ffmpeg.probe(filename='E:/F/Salvaged goods/Videos/Miro/Kvikmyndir/Blade_Runner_2049.1080p.WEB-DL.H264.AC3-EVO/Blade_Runner_2049.1080p.WEB-DL.H264.AC3-EVO.mkv', cmd='ffprobe'))


  


  Here is the Traceback :

  


  Traceback (most recent call last):&#xA;  File "C:\Users\hjalt\PycharmProjects\HelloWorld\app_builder.py", line 50, in <module>&#xA;    pprint(ffmpeg.probe(filename=&#x27;Blade_Runner_2049.1080p.WEB-DL.H264.AC3-EVO.mkv&#x27;, cmd=&#x27;ffprobe&#x27;))&#xA;  File "C:\Users\hjalt\PycharmProjects\HelloWorld\venv\lib\site-packages\ffmpeg\_probe.py", line 20, in probe&#xA;    p = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.PIPE)&#xA;  File "C:\Users\hjalt\AppData\Local\Programs\Python\Python310\lib\subprocess.py", line 969, in __init__&#xA;    self._execute_child(args, executable, preexec_fn, close_fds,&#xA;  File "C:\Users\hjalt\AppData\Local\Programs\Python\Python310\lib\subprocess.py", line 1438, in _execute_child&#xA;    hp, ht, pid, tid = _winapi.CreateProcess(executable, args,&#xA;FileNotFoundError: [WinError 2] The system cannot find the file specified&#xA;</module>

  


• Unable to find/write moov atom in the mp4 recorded stream

  11 juillet 2014, par AnilJ

  I have written the following code to write the webcam feed into a file (.mp4) on disk. The program is successful, but when I try to play the file using player, it says "moov atom not found" and player is not showing anything. The file however is a valid mp4 file according to ffmpeg command.

  This is my main thread where I encode a picture every 30ms.

  public void run() {        
  
  
  
      // Set the thread rolling.
  
      mRunning = true;
  
  
  
      while (mRunning) {
  
          // and display it on the Java Swing window
  
          Record();
  
      }
  
  
  
      // clean up resources
  
      cleanup();
  
  }
  
  
  
  private void Record() {
  
  
  
      IVideoPicture picture = null;
  
      BufferedImage image = null;
  
  
  
      picture = GetNextPicture();
  
      image = Utils.videoPictureToImage(picture);
  
  
  
      if (picture != null) {  
  
          // If recording is enabled, record the webcam stream.
  
          if (mRecordStream) {
  
  
  
              // convert to the right image type
  
              BufferedImage bgrScreen = ConvertToType(image, BufferedImage.TYPE_3BYTE_BGR);
  
  
  
              // encode the image to stream #0
  
              mWriter.encodeVideo(0, bgrScreen, System.nanoTime() - mStartTime, TimeUnit.NANOSECONDS);
  
          }
  
  
  
          try {
  
              Thread.sleep(30);
  
          } catch (InterruptedException e) {
  
              return;
  
          }
  
      }
  
  }

  From the main thread, I do this when I want to stop the recording and close this recording thread. The cleanup() method is eventually called by the main thread to close the writer. The comment does says about writing the trailer (I guess moov atom), but it does not do it. Can someone please help me find where the problem is ?

  public void stopRecording() {      
  
      // Stop the thread loop.
  
      mRunning = false;
  
  }
  
  
  
  private void cleanup() {
  
  
  
      // tell the writer to close and write the trailer if  needed
  
      if (mWriter != null) {
  
          mWriter.close();
  
          mWriter = null;
  
      }
  
  
  
      if (mVideoCoder != null) {
  
          mVideoCoder.close();
  
          mVideoCoder = null;
  
      }
  
  
  
      if (mContainer != null) {
  
          mContainer.close();
  
          mContainer = null;
  
      }
  
  }

• Xcode cannot find symbol for particular source

  19 novembre 2014, par onemach

  I have an iOS project utilizing ffmpeg. The library is pre-built and copied to the project tree

  ffmpeg/
├── include
│   ├── libavcodec
│   ├── libavdevice
│   ├── libavfilter
│   ├── libavformat
│   ├── libavresample
│   ├── libavutil
│   ├── libpostproc
│   ├── libswresample
│   └── libswscale
└── lib
   ├── libavcodec.a
   ├── libavdevice.a
   ├── libavfilter.a
   ├── libavformat.a
   ├── libavresample.a
   ├── libavutil.a
   ├── libpostproc.a
   ├── libswresample.a
   └── libswscale.a

  .h files are omitted above for clarity.

  In the Build Setting, the Header Search Paths and Library Search Paths are added respectively.

  When compiling, Xcode complains about tens of Undefined symbols for architecture x86_64, all about ffmpeg. All the errors come from the same source file. And in another source file, no error is given though it also utilize ffmpeg.