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• How can I reset the path of FFMPEG in the VideoExport library in Processing ?

  11 avril 2021, par bella

  Note : This question was originally titled "How can I reset the path of FFMPEG in Java ?" but, as it has been pointed out in the comments and the answer, the issue is not with Java, so I've changed the title to make it easier to find for others with the same issue.

  


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  I accidentally set the path for FFMPEG to a different folder, and I can't change it back.

  


  I'm using Processing (the library and its IDE) and the user-created Video Export library to capture and write to an mp4 video file. The library required FFMPEG, so I downloaded and installed it. After I installed it, I ran the code, and the library called Java to request the path of FFMPEG. I wrongly set the path to a different folder (which I eventually deleted), and immediately realized my mistake. I ran the code again to see if I could trigger the prompt again to correct the path.

  


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  The console response I received was : (I'm sure most of it doesn't have to do with the actual issue. However, I wanted to show all of it in case it somehow does.)

  


  


  Oct 24, 2016 10:23:25 PM java.util.prefs.WindowsPreferences 
WARNING : Could not open/create prefs root node Software\JavaSoft\Prefs
at root 0x80000002. Windows RegCreateKeyEx(...) returned error code 5.
java.io.IOException : Cannot run program
"C :...\Processing\Octree_Graphics\data\FFMPEG\ff-prompt.bat" :
CreateProcess error=2, The system cannot find the file specified at
java.lang.ProcessBuilder.start(ProcessBuilder.java:1048) at
com.hamoid.VideoExport.startFfmpeg(Unknown Source) at
com.hamoid.VideoExport.initialize(Unknown Source) at
com.hamoid.VideoExport.saveFrame(Unknown Source) at
Octree_Graphics.draw(Octree_Graphics.java:90) at
processing.core.PApplet.handleDraw(PApplet.java:2399) at
processing.opengl.PSurfaceJOGL$DrawListener.display(PSurfaceJOGL.java:731)
at
jogamp.opengl.GLDrawableHelper.displayImpl(GLDrawableHelper.java:692)
at jogamp.opengl.GLDrawableHelper.display(GLDrawableHelper.java:674)
at
jogamp.opengl.GLAutoDrawableBase$2.run(GLAutoDrawableBase.java:443)
at
jogamp.opengl.GLDrawableHelper.invokeGLImpl(GLDrawableHelper.java:1293)
at
jogamp.opengl.GLDrawableHelper.invokeGL(GLDrawableHelper.java:1147)
at com.jogamp.newt.opengl.GLWindow.display(GLWindow.java:759) at
com.jogamp.opengl.util.AWTAnimatorImpl.display(AWTAnimatorImpl.java:81)
at com.jogamp.opengl.util.AnimatorBase.display(AnimatorBase.java:452)
at
com.jogamp.opengl.util.FPSAnimator$MainTask.run(FPSAnimator.java:178)
at java.util.TimerThread.mainLoop(Timer.java:555) at
java.util.TimerThread.run(Timer.java:505) Caused by :
java.io.IOException : CreateProcess error=2, The system cannot find the
file specified at java.lang.ProcessImpl.create(Native Method) at
java.lang.ProcessImpl.(ProcessImpl.java:386) at
java.lang.ProcessImpl.start(ProcessImpl.java:137) at
java.lang.ProcessBuilder.start(ProcessBuilder.java:1029) ... 17 more
VideoExport error : Ffmpeg failed. Study
C :...\Processing\Octree_Graphics\basic.mp4.txt for more details.

  


  


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  I need to find a way to reset the path of FFMPEG that Java has. I have tried uninstalling and reinstalling the library, but I haven't tried Java (I don't want to mess with anything it has in its current state).

  


• lavfi/dnn : refine code for frame pre/proc processing

  1er mars 2021, par Guo, Yejun

  lavfi/dnn : refine code for frame pre/proc processing
  

  • [DH] libavfilter/dnn/dnn_backend_native.c
  • [DH] libavfilter/dnn/dnn_backend_openvino.c
  • [DH] libavfilter/dnn/dnn_backend_tf.c
  • [DH] libavfilter/dnn_filter_common.c
  • [DH] libavfilter/dnn_filter_common.h
  • [DH] libavfilter/dnn_interface.h

• ffmpeg pipe Invalid data found when processing input

  28 mars 2021, par Ankit Maheshwari

  Here is my configuration.


  


  


  


  const ffmpegPath = require('@ffmpeg-installer/ffmpeg').path;
const spawn = require('child_process').spawn;

ffmpeg = spawn(ffmpegPath, [
      
// Remove this line, as well as `-shortest`, if you send audio from the browser.
      // '-f', 'lavfi', '-i', 'anullsrc',

      // FFmpeg will read input video from STDIN
      '-i', '-',

      // -re flag means to Read input at native frame rate.
      '-re', '-y',

      // thread_queue_size added to avoid err: Thread message queue blocking; consider raising the thread_queue_size option, required before each input - this is for image2
      // '-thread_queue_size', '2048',

      // REF TO OVERLAY 
      // https://stackoverflow.com/questions/10438713/overlay-animated-images-with-transparency-over-a-static-background-image-using-f?rq=1
      // -loop loops the background image input so that we don't just have one frame, crucial!

      // The image file muxer writes video frames to image files, http://underpop.online.fr/f/ffmpeg/help/image2-1.htm.gz
      '-f', 'image2',

      // The -loop option is specific to the image file demuxer and gif muxer, so it can't be used for typical video files, but it can be used to infinitely loop a series of input images.
      '-loop', '1',

      // pattern_type is used to determine the format of the images contained in the files.
      // Read images matching the "*.png" glob pattern, that is files terminating with the ".png" suffix
      '-pattern_type', 'glob',

      // '-i', `images/${streamConfigData.youtube_key}/destination/image-*.png`,

      '-i', `images/${streamConfigData.youtube_key}/overlay/abc.png`,

      // '-vf', 'scale=1920x1080:flags=lanczos',
      
      // -shortest ends encoding when the shortest input ends, which is necessary as looping the background means that that input will never end.
      // 'overlay=shortest=1',

      "-filter_complex", "[1:v]format=rgba,colorchannelmixer=aa=1[fg];[0][fg]overlay",
      
      // Because we're using a generated audio source which never ends,
      // specify that we'll stop at end of other input.  Remove this line if you
      // send audio from the browser.
      // '-shortest',
      
      // If we're encoding H.264 in-browser, we can set the video codec to 'copy'
      // so that we don't waste any CPU and quality with unnecessary transcoding.
      // If the browser doesn't support H.264, set the video codec to 'libx264'
      // or similar to transcode it to H.264 here on the server.
      // '-vcodec', 'libx264',
      // it is not possible to filter and stream copy the same stream at the same time. https://stackoverflow.com/a/53526514/4057143
      '-vcodec', 'copy',
      
      // if browser not supports encoding AAC, we must transcode the audio to AAC here on the server.
      // '-acodec', 'aac',

      // Use this rate control mode if you want to keep the best quality and care less about the file size. CRF scale is 0–51, where 0 is lossless, 23 is the default, and 51 is worst quality possible. A lower value generally leads to higher quality, https://trac.ffmpeg.org/wiki/Encode/H.264
      '-crf', '23',

      // preset provide a certain encoding speed to compression ratio. A slower preset will provide better compression. medium – default preset, https://trac.ffmpeg.org/wiki/Encode/H.264
      '-preset', 'ultrafast',

      // -r set the frame rate. Generally, -r. Use the filter when you need to change framerate before applying further filters.
      // '-r', '30',
      // '-framerate', '30',

      //debug level logs
      '-loglevel', 'debug',
      '-v', 'verbose',

      // -g GOP_LEN_IN_FRAMES, -g sets the keyframe interval. https://superuser.com/a/908325
      '-g', '60',

      // video timescale, not sure what it is!
      '-video_track_timescale', '1000',

      // a live stream with more/less constant bit rate, to be able to control the bandwidth used.
      // a live stream with limited bit rate
      '-b:v', '15000k',
      // '-maxrate', '4000k',
      // '-bufsize', '8000k',

      // FLV is the container format used in conjunction with RTMP
      '-f', 'flv',
      
      // The output RTMP URL.
      // For debugging, you could set this to a filename like 'test.flv', and play
      // the resulting file with VLC.
      rtmpUrl 
    ], {
      env: {
          NODE_ENV: 'production',
          PATH: process.env.PATH
      }
    });