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• Rotation on Video frame image makes video quality low and becomes green ffmpeg opencv

  21 novembre 2013, par bindal

  I am working on one application in which i have to record video on touch which includes pause recording so , i am using FFmpegFrameRecorder for that

  But when i am recording video with rear camera then in onpreviewframe
  i am getting yuvIplImage in portrait mode that is correct but when i
  am recording with front camera in portrait mode then in onPreviewframe
  i am getting image upside down , so my half, so from that result my
  half video is showing in correct portrait mode and remaining half
  video id showing upside down, so i am applying rotation on yuvIplImage
  when recording from front camera

  Here is my onPreviewFrame Method

   @Override
  
              public void onPreviewFrame(byte[] data, Camera camera) {
  
  
  
                  long frameTimeStamp = 0L;
  
                  if (mAudioTimestamp == 0L && firstTime > 0L)
  
                      frameTimeStamp = 1000L * (System.currentTimeMillis() - firstTime);
  
                  else if (mLastAudioTimestamp == mAudioTimestamp)
  
                      frameTimeStamp = mAudioTimestamp + frameTime;
  
                  else {
  
                      long l2 = (System.nanoTime() - mAudioTimeRecorded) / 1000L;
  
                      frameTimeStamp = l2 + mAudioTimestamp;
  
                      mLastAudioTimestamp = mAudioTimestamp;
  
                  }
  
                  synchronized (mVideoRecordLock) {
  
                      if (recording && rec && lastSavedframe != null
  
                              && lastSavedframe.getFrameBytesData() != null
  
                              && yuvIplImage != null) {
  
                          mVideoTimestamp += frameTime;
  
                          if (lastSavedframe.getTimeStamp() > mVideoTimestamp)
  
                              mVideoTimestamp = lastSavedframe.getTimeStamp();
  
                          try {
  
                              yuvIplImage.getByteBuffer().put(
  
                                      lastSavedframe.getFrameBytesData());
  
                              videoRecorder.setTimestamp(lastSavedframe
  
                                      .getTimeStamp());
  
  
  
                              // if (defaultCameraId == 1) {
  
                              // CvSize size = new CvSize(yuvIplImage.height(),
  
                              // yuvIplImage.width());
  
                              // IplImage yuvIplImage2 = opencv_core.cvCreateImage(
  
                              // size, yuvIplImage.depth(),
  
                              // yuvIplImage.nChannels());
  
                              //
  
                              // videoRecorder.record(yuvIplImage2);
  
                              // } else {
  
  
  
                              // }
  
  
  
  
  
  
  
                              if (defaultCameraId == 1) {
  
                                  yuvIplImage = rotate(yuvIplImage, 270);
  
  
  
                                  videoRecorder.record(yuvIplImage);
  
                              }else
  
                              {
  
                                  videoRecorder.record(yuvIplImage);
  
                              }
  
                              // else
  
  
  
                              // opencv_core.cvTranspose(yuvIplImage, yuvIplImage);
  
                          } catch (com.googlecode.javacv.FrameRecorder.Exception e) {
  
                              e.printStackTrace();
  
                          }
  
                      }
  
                      lastSavedframe = new SavedFrames(data, frameTimeStamp);
  
                  }
  
              }
  
          } 

  Here is rotation function

  public static IplImage rotate(IplImage image, double angle) {
  
      IplImage copy = opencv_core.cvCloneImage(image);
  
  
  
      IplImage rotatedImage = opencv_core.cvCreateImage(
  
              opencv_core.cvGetSize(copy), copy.depth(), copy.nChannels());
  
      CvMat mapMatrix = opencv_core.cvCreateMat(2, 3, opencv_core.CV_32FC1);
  
  
  
      // Define Mid Point
  
      CvPoint2D32f centerPoint = new CvPoint2D32f();
  
      centerPoint.x(copy.width() / 2);
  
      centerPoint.y(copy.height() / 2);
  
  
  
      // Get Rotational Matrix
  
      opencv_imgproc.cv2DRotationMatrix(centerPoint, angle, 1.0, mapMatrix);
  
      // opencv_core.cvReleaseImage(copy);
  
  
  
      // Rotate the Image
  
      opencv_imgproc.cvWarpAffine(copy, rotatedImage, mapMatrix,
  
              opencv_imgproc.CV_INTER_CUBIC
  
                      + opencv_imgproc.CV_WARP_FILL_OUTLIERS,
  
              opencv_core.cvScalarAll(170));
  
      opencv_core.cvReleaseImage(copy);
  
      opencv_core.cvReleaseMat(mapMatrix);
  
      return rotatedImage;
  
  }

  But Final output of video makes half of the video green

  Thanks in advance

• avcodec : Fix duration error after seek operation

  15 novembre 2013, par wangxingchao

  avcodec : Fix duration error after seek operation
  After seek, s->duration need recalculation, AVCodecParserContext need be set
  
  again. Without the fix, the first audio packet would be dropped after
  
  compute_pkt_fields() as the final pts/dts become invalid.
  Signed-off-by : wangxingchao <wangxingchao@xiaomi.com>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/cook_parser.c

• How to use ffmpeg without root access

  6 octobre 2016, par Charlie227

  I’ve successfully installed ffmpeg using ssh, as root, on my dedicated server (CentOS 7).
  ffmpeg works fine - but now I need to use it without root access.

  When i try to use ffmpeg without root access, I get the following error :

  ffmpeg: error while loading shared libraries: libx264.so.148: 
  
          cannot open shared object file: No such file or directory

  The final goal is to be able to use ffmpeg inside my PHP scripts which do not root access.

  Any help is appreciated.