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• Invoking ffmpeg through bash through command prompt

  17 octobre 2020, par Cheezy

  I have a ffmpeg command which I am trying to run in python. Invoking it in wsl or bash works fine.

  


  The command :

  


  ffmpeg -y -i C:/Users/joel/src/tldr-dw/src/test/video_editor/input.mp4 -lavfi '[0:v]scale=ih*16/9:-1,boxblur=luma_radius=min(h\,w)/20:luma_power=1:chroma_radius=min(cw\,ch)/20:chroma_power=1[bg];[bg][0:v]overlay=(W-w)/2:(H-h)/2,crop=h=iw*9/16,scale=1920x1080' -vb 5m C:/Users/joel/src/tldr-dw/src/test/video_editor/input_output.mp4

  


  However, I am trying to get this to run in python. I am invoking it like so :

  


  subprocess.check_output([r'C:\Windows\SysNative\bash.exe', '-c', bash_command], shell=True)

  


  but am getting an error message :

  


  C:/Users/joel/src/tldr-dw/src/test/video_editor/input.mp4: Protocol not found Did you mean file:C:/Users/joel/src/tldr-dw/src/test/video_editor/input.mp4?

  


  I've tried appending "file" to the input/output paths and even switching to windows line endings. When I do the latter, it seems to escape the slashes. I get this error message :

  


  C:Usersjoelsrctldr-dwsrctestvideo_editorinput.mp4: Protocol not found Did you mean file:C:Usersjoelsrctldr-dwsrctestvideo_editorinput.mp4?

  


  All I am trying to do is run a bash command in ffmpeg from the command prompt, essentially. I get similar error messages on there. What is going on with the file paths ?

  


• JavaCV Stream-Test code giving Error

  23 juin 2015, par user1507600

  I’m hoping someone might be able to tell me what I’m doing wrong here. I downloaded vanevery’s GitHub project “JavaCV-0.5-Stream-Test" which is a couple of years old so I updated to the latest JavaCV version 0.11. But Android Studio is returning the error...

  Error :

  "record(org.bytedeco.javacpp.Frame) in FFmpegFrameRecorder cannot be
  applied to (org.bytedeco.javacpp.opencv_core.lplimage)" for the line
  of code which reads recorder.record(yuvIplimage), under
  onPreviewFrame.

  Here is my code :

      @Override
  
      public void onPreviewFrame(byte[] data, Camera camera) {
  
  
  
          if (yuvIplimage != null && recording) {
  
  
  
              videoTimestamp = 1000 * (System.currentTimeMillis() - startTime);
  
  
  
              // Put the camera preview frame right into the yuvIplimage object
  
              yuvIplimage.getByteBuffer().put(data);
  
  
  
              try {
  
                  // Get the correct time
  
                  recorder.setTimestamp(videoTimestamp);
  
  
  
                  // Record the image into FFmpegFrameRecorder
  
                  recorder.record(yuvIplimage);
  
  
  
              } catch (FFmpegFrameRecorder.Exception e) {
  
                  Log.v(LOG_TAG,e.getMessage());
  
                  e.printStackTrace();
  
              }
  
          }
  
      }

• libVLC using ffmpeg source code [closed]

  31 août 2015, par Moebius

  I am working with ffmpeg in order to encode video but I am not getting the results I expect. So I want to have source code examples to get inspiration. I know that libVLC use ffmpeg, but I can’t retrieve the functions using this framework out of the massive documentation. Do you know which file/function/class are concerned ? If you have any idea of interesting documentation/example of decoding using ffmpeg, please let me know (I already checked opencv).

  Thanks.