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• Slow down background processing when USB is disconnected

  28 mai 2021, par Taku

  I create video editing app with openCV and ffmpeg in kotlin.
After taking movie with USB debugging, it can edited for about 5 min.
but, as soon as disconnect the USB, it will take 30 min to edit the video for some reason...

  


  I am in trouble because I can not correct it without debugging.
Is it problem to do from editing it to saving it in the background ?

  


  class OpenCV(val inputPath: String, val context: Context, val setuptime: Int){

         .....

        init{
            videoCapture = VideoCapture()
            videoCapture.open(inputPath)

            videoCapture.grab()
            width = videoCapture.get(Videoio.CAP_PROP_FRAME_WIDTH)
            height = videoCapture.get(Videoio.CAP_PROP_FRAME_HEIGHT)

            val file = File(context.getExternalFilesDir(Environment.DIRECTORY_MOVIES), "output.avi")

            writer = VideoWriter()
            writer.open(
                file.path,
                VideoWriter.fourcc('M', 'J', 'P', 'G'),
                30.0,
                Size(width,height)
            )


            if(writer.isOpened){
                posefinish=true
                val inpMat = Mat(width.toInt(), height.toInt(),CvType.CV_8UC4)
                while (true){
                    if (!posefinish){continue}//Wait in an infinite loop until one frame is processed

                    if(videoCapture.read(inpMat)){
                        posefinish=false
                        if(inpMat.dims() == 0){ posefinish = true;  continue }


                        val bmp = Bitmap.createBitmap(
                            width.toInt(),
                            height.toInt(),
                            Bitmap.Config.ARGB_8888
                        )

                        Utils.matToBitmap(inpMat, bmp, false)

                        DrawPose(inpMat, bmp)// the function to edit video frame by frame

                    }else{
                        if(MainActivity.debag){Log.d(MainActivity.TAG, "videoCapture終了！")}
                        writer.release()
                        videoCapture.release()


                        with_ffmpeg(file, file2, file3, file4)//     avi -> mp4 -> save video  with ffmpeg

                        break
                    }
                }

            }
        }

    }


  


  And I call the above code with thread of coroutine.

  


  val job =CoroutineScope(Dispatchers.Default).launch {
                            OpenCV(file.toString(),this, taskSec)
                        }


  


• FFmpeg, preserve album cover when converting from MP3 to Opus (OGG)

  20 mai 2021, par sampormta

  So basically I'm using FFmpeg Batch AV Converter (which is very good and I recommend) and I'm trying to convert all my music which is stored in FLAC, AAC and MP3 to Opus (OGG).

  


  The problem is that I don't know what should I do so that the album cover is preserved in the conversion. As in, the metadata itself is copied to the Opus file, except the album cover.

  


  Now of course I could add it later with a metadata editor, but it's too much work and it may even be unnecessary if there is a command to do that.

  


  I currently use :

  


  -c:a libopus -b:a 128k -vbr on -compression_level 10 -frame_duration 20 -application audio


  


  Any help will be appreciated.

  


  Thank you !

  


• FFmpeg Overlay Zoom + Static Blurred Background

  17 mai 2021, par John Matley

  I am trying to make a video from a single image which will take the image and (regardless of height/width) will stretch to fit the whole screen (1920x1080) and be blurred. Next I want to take the same image, keeping the aspect ratio, zoom out to 100% for the entire 10 second video.

  


  The code I wrote does most of this fine, except it also zooms the blurred background. I just want a static blurred background with a floating zooming original image over the top.

  


  Here's what I have so far :

  


  ffmpeg -y -i image.jpg -filter_complex "[0]scale=-1:1080[in];[0]scale=1920:1080,boxblur=10:10,setsar=1[bg];[bg][in]overlay=(W-w)/2:(H-h)/2,scale=7680x4320,zoompan=z='if(lte(zoom,1.0),1.2,max(1.001,zoom-0.0008))':x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)':s=1920x1080:d=600[output]" -map "[output]" -t 10 -shortest -pix_fmt yuva420p -c:v h264_qsv -r 60 video.mp4


  


  All I want is to keep the blurred background static at 100% whilst the main image zooms out to 100% over the 10 second duration..

  


  Any help would be appreciated.