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• "Format" or style the output of showwaves/showwavespic in ffmpeg

  9 avril 2020, par flomei

  I'm trying to get my head wrapped around ffmpeg and its functions and filters.

  



  showwaves and showwavespic already create nice output, but I'm looking to style it even more. Lots of audioplayers for example create a "waveform" like the following, which would be a job for showwavespic, I think. (I think soundcloud for example does create a form like this with actual data.)


  



  I wonder if I can use ffmpeg to create something like this directly from my raw input data. I thought I might need to split my audio track into X parts, calculate the average distance from the Y-axis and then create a bar. But I'm not sure if I can manage to do that with ffmpeg or if I need to build more of a toolchain for that.

  



  If I could create the output of showwaves to look like that above, that would be great. On the other hand I'd already be happy if I could just increase the stroke width of the showwaves output.

  



  Didn't found anything about the in the documentation or I looked at the wrong places, because I don't yet get the big picture of ffmpeg.

  


• ffmpeg : Send mp4 to fake webcam, "Invalid argument"

  9 avril 2020, par Joe Bid

  Trying to create a new fake webcam device (/dev/video2) and play a video on it so I can use it as a virtual webcam.

  



  Steps I took :

  



  sudo apt-get install v4l2loopback-dkms
sudo modprobe v4l2loopback
sudo depmod -a

ffmpeg -i vid1.mp4 -vcodec rawvideo -pix_fmt yuv420p -threads 0 -f v4l2 /dev/video2


  



  The error from the ffmpeg command :

  



  ioctl(VIDIOC_G_FMT): Invalid argument
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:0
Conversion failed!


  



  No idea what to do.

  


• java.io.IOException : Cannot run program "/data/user/0/com.package.name/files/ffmpeg" : error=13, Permission denied

  12 avril 2020, par KANAYO AUGUSTIN UG

  I am trying to cut a video using FFmpeg library from com.writingminds:FFmpegAndroid:0.3.2...
When I try to run my command

  



  String[] complexCommand = { "-y", "-i", inputFilePath,"-ss", "" + trimStart, "-t", "" + trim, "-c","copy", outputFilePath};
execFFmpegBinary(complexCommand);


  



  I get this error :

  



  


  E/FFmpeg : Exception while trying to run : [Ljava.lang.String ;@c7a48dd

  
 


  java.io.IOException : Cannot run program "/data/user/0/com.package.name/files/ffmpeg" : error=13, Permission denied

  


  



  Even after making sure the library loaded successfully

  



  private void loadFFMpegBinary() {
    try {
        if (ffmpeg == null) {
            ffmpeg = FFmpeg.getInstance(cntxt);
        }
        ffmpeg.loadBinary(new LoadBinaryResponseHandler() {
            @Override
            public void onFailure() {
                Log.i("success", "false");
            }

            @Override
            public void onSuccess() {
                Log.i("success", "true");
            }
        });
    } catch (FFmpegNotSupportedException e) {
    } catch (Exception e) {
    }
}


  



  I have enabled WRITE_PERMISSION in Android.manifest file, and I also tried to write a file to the storage and it worked.

  



  I guess FFmpeg has a default path to write a file which is /data/user/0/com.package.name/files/ffmpeg, but I need to change the default path please anyone with an idea ?