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• JAVA Spring : Grabbing Image from a multipartFile video via FFMPEG JavaCV

  29 août 2023, par Thanh Hiếu Nguyễn

  I'm trying to achieve Grabbing a frame from a MultipartFile or URL and here's my attempt.

  


  URL :

  


  InputStream inputStream = new java.net.URL(video.getUrl()).openStream();

FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(inputStream);
grabber.start();

int frameRate = (int) grabber.getFrameRate();
int targetFrameNumber = (int) (frameRate * timeLengthSeconds);

grabber.setFrameNumber(targetFrameNumber);
Frame frame = grabber.grab();

grabber.stop();

if (frame != null) {
    Java2DFrameConverter converter = new Java2DFrameConverter();
    BufferedImage bufferedImage = converter.getBufferedImage(frame);
    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
    ImageIO.write(bufferedImage, "jpeg", byteArrayOutputStream);
    byte[] bytes = byteArrayOutputStream.toByteArray();


  


  MultipartFile :

  


  byte[] videoBytes = video.getBytes();

FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(new ByteArrayInputStream(videoBytes));
int frameRate = (int) 30;
int targetFrameNumber = (int) (frameRate * timeLengthSeconds);

grabber.setFrameNumber(targetFrameNumber);
grabber.setVideoStream(10);
grabber.start();


Frame frame = grabber.grab();

grabber.stop();

if (frame != null) {
    Java2DFrameConverter converter = new Java2DFrameConverter();
    BufferedImage bufferedImage = converter.getBufferedImage(frame);
    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
    ImageIO.write(bufferedImage, "jpeg", byteArrayOutputStream);
    byte[] bytes = byteArrayOutputStream.toByteArray();


  


  Both of them generates an AUDIO type of Frame, so later I can't buffer an image out of it, tried different videos, frameRate, frameNumber, same result.

  


  UPDATE :
  
So I manage to get the frame with following code

  


  byte[] videoBytes = video.getBytes();
FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(new ByteArrayInputStream(videoBytes));
grabber.setFormat("mp4");
int frameRate = (int) grabber.getFrameRate();
int targetFrameNumber = (int) (frameRate * timeLengthSeconds);

grabber.setFrameNumber(targetFrameNumber);
grabber.setVideoStream(0);
grabber.start();


Frame frame = grabber.grabImage();

grabber.stop();


  


  But another problem occurred

  


  A fatal error has been detected by the Java Runtime Environment:

EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x000001dd6cac79d6, pid=20824, tid=21048 
 JRE version: Java(TM) SE Runtime Environment 18.9 (11.0.12+8) (build 11.0.12+8-LTS-237)
 Java VM: Java HotSpot(TM) 64-Bit Server VM 18.9 (11.0.12+8-LTS-237, mixed mode, tiered, compressed oops, g1 gc, windows-amd64)
 Problematic frame:
 J 657 c1 jdk.internal.misc.Unsafe.getByte(J)B java.base@11.0.12 (7 bytes) @ 0x000001dd6cac79d6 [0x000001dd6cac79a0+0x0000000000000036]


  


  Any help is appreciated !

  


• Révision 18091 : Lorsuq’un formulaire ajax ajoute une action en queue, elle n’est pas declenchée ...

  17 juin 2011, par cedric -

  Particulièrement critique si le site a peu de traffic. On procède donc à un appel du pipeline affichage_final, sur un texte vide, avec une globale html=false pour empecher toute tentative d’affichage, ce qui permet neanmoins de declencher des actions du type cron (...)

• ffmpeg works fine most of the time in java except for this command (merging), and this command works fine directly in terminal

  14 mai 2014, par Ron I

  When I run this from the command line it works (merges two videos side by side) :

  /usr/local/bin/ffmpeg -i /Users/ron/Dropbox/JAMR/Technology/workspace/JAMR/sandbox/test.mov -i /Users/ron/Dropbox/JAMR/Technology/workspace/JAMR/sandbox/test1.mov -filter_complex "[0:v:0]pad=iw*2:ih[bg]; [bg][1:v:0]overlay=w" /Users/ron/Dropbox/JAMR/Technology/workspace/JAMR/sandbox/merged.mov

  However, when I run it in java, I get this from the console :

  [AVFilterGraph @ 0x7fd44ad00440] No such filter: '"'
  
  Error configuring filters.

  here is the text I am returning (copied directly) which is what I am sending to be executed. It is exactly the same, except I use the escape character before the quote symbol, so a " becomes \" :

  "/usr/local/bin/ffmpeg -i /Users/ron/Dropbox/JAMR/Technology/workspace/JAMR/sandbox/test.mov -i /Users/ron/Dropbox/JAMR/Technology/workspace/JAMR/sandbox/test1.mov -filter_complex \"[0:v:0]pad=iw*2:ih[bg]; [bg][1:v:0]overlay=w\" /Users/ron/Dropbox/JAMR/Technology/workspace/JAMR/sandbox/merged.mov";

  All other ffmpeg tests have worked except this.... (the only one where I use a " character)

  Can anyone figure it out ?