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• ffmpeg simple re-mux short video : Invalid data found when processing input

  19 mai 2021, par Nic

  I try to remux (surveillance cam) raw AVC files (file header begins with "STL Stream Format v1.0") to get playable MP4 files.

  


  The command I used does work for the longer file but not for the short one :

  


  .\ffmpeg.exe -framerate 25 -i video.ssf -c copy video.mp4


  


  Good result for long video :

  


  Trailing option(s) found in the command: may be ignored.
Input #0, h264, from 'file.ssf':
  Duration: N/A, bitrate: N/A
  Stream #0:0: Video: h264 (Baseline), yuv420p(progressive), 704x576, 25 fps, 25 tbr, 1200k tbn, 50 tbc
Output #0, mp4, to 'file.mp4':
  Metadata:
    encoder         : Lavf58.76.100
  Stream #0:0: Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(progressive), 704x576, q=2-31, 25 fps, 25 tbr, 1200k tbn, 1200k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
[mp4 @ 0000020c1a048240] Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
[NULL @ 0000020c1997f640] sps_id 32 out of range00:00:00.00 bitrate=384000.0kbits/s speed= 0.2x
frame= 4814 fps=0.0 q=-1.0 Lsize=   21829kB time=00:03:12.52 bitrate= 928.9kbits/s speed=2.34e+03x
video:21808kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.098001%


  


  Bad result for short video :

  


  [AVIOContext @ 000002c6db8e6d80] Statistics: 846679 bytes read, 0 seeks
video.ssf: Invalid data found when processing input


  


  Is there anything I can adjust to fix this ?

  


  Thanks !

  


  Nico

  


• lavfi/dnn : refine code to separate processing and detection in backends

  17 mai 2021, par Guo, Yejun

  lavfi/dnn : refine code to separate processing and detection in backends
  

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

• 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)
                        }