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• How to take thumbnail image from video bytes[] using java ?

  14 mai 2021, par Sreeraj S

  My requirement is, i want to show video thumbnail in fancybox. But unfortunatly its not showing thumbnail. its required seperate image for thumbnail.

  


  Sample fancybox code

  


  <a data-fancybox="data-fancybox" data-type="iframe" data-width="640" data-height="360" href="http://download.blender.org/peach/bigbuckbunny_movies/BigBuckBunny_320x180.mp4">&#xA;    <img class='card-img-top img-fluid' src="local/cache-vignettes/L300xH169/bird1jpg-6986985-13aa4.jpg?1620994482" width='300' height='169' />&#xA;</a>&#xA;

  


  So i decided to maintain two url

  


  one for video and other for video thumbnail.

  


  

  1. http://localhost:8080/resources?resourceId=126 -> it will return video

  


  2. http://localhost:8080/resources?resourceId=126&thumbnail=true -> it will return thumbnail image

  


  


  I haven't any idea about this but I had tried for video thumbnail with https://github.com/bytedeco/javacv. But i got 'OutofMemory' exception

  


  pom.xml

  


  <dependency>&#xA;    <groupid>org.bytedeco</groupid>&#xA;    <artifactid>javacv-platform</artifactid>&#xA;    <version>1.5.5</version>&#xA;  </dependency>&#xA;

  


  My java servlet code for thumbnail image is as follows

  


  Java2DFrameConverter converter = new Java2DFrameConverter();
BufferedImage current;
BufferedImage next;
byte[] videoBytes = //video byte array fetched from db
ByteArrayOutputStream baos = new ByteArrayOutputStream();

FFmpegFrameGrabber frameGrabber = new FFmpegFrameGrabber(new ByteArrayInputStream(videoBytes));
frameGrabber.start();
try {
    Frame frame = frameGrabber.grab();
    next = converter.convert(frame);

    current = new BufferedImage(next.getWidth(), next.getHeight(), next.getType());
    ImageIO.write(current, "png", baos);
    byte[] bytes = baos.toByteArray();
    frameGrabber.stop();


    response.setContentType("image/png");
    try (OutputStream o = response.getOutputStream()) {
        o.write(bytes);
        o.flush();
    }


  


  Edit

  


  Video section is working fine. i.e. can able to view video from this url http://localhost:8080/resources?resourceId=126

  


• Hardware acceleration FFMPEG not speeding up rendering at the moment

  13 août 2021, par AlphaDjango

  I currently have ffmpeg running on a computer (ubuntu server 20.04) with a nvidia MSI GTX 1660 6GB GAMING X TWIN FORZ 7 GRAPHICS CARD and a Ryzen 5 3600 cpu. I have installed the nvidia drivers for linux for it.

  


  Currently when enabling and disabling hardware acceleration the rendering takes the same amount of time which is around 1 minute to render per 1 minute of footage.

  


  When using a similar setup in davinci resolve it takes 1/4 of the time to apply similar background effects and concating the clips which makes me question if I am using hardware acceleration of if my ffmpeg command is not optimised for it ?

  


  This is the code which takes in around 50 mp4 clips and joins them together, scales them in size and applies a background blur on the sides of clips

  


  ffmpeg  -hwaccel cuda  -f concat -safe 0 -i /home/anon/project/MEDIAFILES/work_ffmpeg_space/concat_file_user_root_projectId_1.txt  -s 1920x1080 -filter_complex '[0:v]scale=ih*16/9:-1:flags=bicubic,boxblur=luma_radius=min(h\,w)/20:luma_power=2: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' -af aselect=concatdec_select,aresample=async=1  /home/anon/project/MEDIAFILES/created_videos/finalvideo_user_root_projectId_1.mp4


  


  Any tips or ways to optimise the code to use hardware acceleration will be greatly appreciated !

  


  This is my ffmpeg configuration

  


    ffmpeg version N-103221-gc3ef9e0277 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.3.0-17ubuntu1~20.04)
  configuration: --pkg-config-flags=--static --enable-nonfree --enable-gpl --enable-version3 --enable-libmp3lame --enable-libvpx --enable-libopus --enable-opencl --enable-libxcb --enable-opengl --enable-nvenc --enable-vaapi --enable-vdpau --enable-ffplay --enable-ffprobe --enable-libxvid --enable-libx264 --enable-libx265 --enable-openal --enable-openssl --enable-cuda-nvcc --enable-cuvid --extra-cflags=-I/usr/lcal/cuda/include --extra-ldflags=-L/usr/local/cuda/lib64 --extra-libs=-lpthread
  libavutil      57.  3.100 / 57.  3.100
  libavcodec     59.  4.101 / 59.  4.101
  libavformat    59.  4.101 / 59.  4.101
  libavdevice    59.  0.100 / 59.  0.100
  libavfilter     8.  1.103 /  8.  1.103
  libswscale      6.  0.100 /  6.  0.100
  libswresample   4.  0.100 /  4.  0.100
  libpostproc    56.  0.100 / 56.  0.100


  


• playing video in android using javacv ffmpeg

  20 février 2017, par d91

  I’m trying to play a video stored in sd card using javacv. Following is my code

  public class MainActivity extends AppCompatActivity {
  
  
  
      @Override
  
      protected void onCreate(Bundle savedInstanceState) {
  
          super.onCreate(savedInstanceState);
  
          setContentView(R.layout.activity_main);
  
          playthevideo();
  
      }
  
  
  
      protected void playthevideo() {
  
  
  
         String imageInSD = "/storage/080A-0063/dama/" + "test3.mp4";
  
  
  
         FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(imageInSD);
  
  
  
         AndroidFrameConverter converterToBitmap = new AndroidFrameConverter();
  
  
  
         OpenCVFrameConverter.ToIplImage converterToipi = new OpenCVFrameConverter.ToIplImage();
  
  
  
             try {
  
                 Log.d("Tag", "try");
  
                 grabber.start();
  
                 Log.d("Tag", "started");
  
  
  
                 int i = 0;
  
                 IplImage grabbedImage = null;
  
  
  
                 ImageView mimg = (ImageView) findViewById(R.id.a);
  
  
  
                 grabber.setFrameRate(grabber.getFrameRate());
  
                 ArrayList<bitmap> bitmapArray = new ArrayList<bitmap>();
  
                 while (((grabbedImage = converterToipi.convert(grabber.grabImage())) != null)) {
  
  
  
                     Log.d("Tag", String.valueOf(i));
  
  
  
                     int width = grabbedImage.width();
  
  
  
                     int height = grabbedImage.height();
  
  
  
                     if (grabbedImage == null) {
  
                         Log.d("Tag", "error");
  
                     }
  
  
  
                     IplImage container = IplImage.create(width, height, IPL_DEPTH_8U, 4);
  
  
  
                     cvCvtColor(grabbedImage, container, CV_BGR2RGBA);
  
  
  
                     Bitmap bitmapnew = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
  
  
  
                     bitmapnew.copyPixelsFromBuffer(container.getByteBuffer());
  
  
  
                     if (bitmapnew == null) {
  
                         Log.d("Tag", "bit error");
  
                     }
  
  
  
                     mimg.setImageBitmap(bitmapnew);
  
  
  
                     mimg.requestFocus();
  
  
  
                     i++;
  
                 }
  
  
  
                 Log.d("Tag", "go");
  
  
  
             }
  
             catch(Exception e) {
  
  
  
            }
  
       }
  
  }
  
  </bitmap></bitmap>

  just ignore the tags because those are only for my testing purposes..
  When I run this code the main activity layout is still loading while android monitor shows the value of "i" (which is current frame number) and suddenly after frame number 3671 code exits the while loop and the imageview shows a frame which is not the end frame of that video(it somewhere around staring of the video).
  I was unable to find a way to show the grabbed frames from ffmpegframegrabber so i decided to show the image in imageview in this way. Can anybody tell me why I’m getting this error or another error non path to play and show the video in android activity ?
  BTW javacv 1.3.1 is imported correctly into my android dev environment. Thanks.