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• Encoding of video returns 0, and nothing written to the output file

  14 juillet 2014, par AnilJ

  I have written a code to record the webcam feed into a file on disk. I am attempting to do this using IContainer class rather than IMediaWriter class. I am pasting the code snippet below showing important sections of the code.

  The problem I am facing is that nothing is being written to the file. Some of the observations I have made are as follows :

  1. In the Record() function, the ’while’ loop is kicked off, but the mVideoEncoder.encodeVideo(packet, frame, offset) ; method always returns zero (0). This results in no picture complete and no data is being written to the output file. Can you please provide clue as to what is missing ?
  2. I checked that the frame size is 80640, which confirms that frame has data.
  3. I see that only header and trailer is being written to the file.

  Let me know if you need any other information.

  public class WebcamRecorder {
  
  
  
      private boolean StartVideoEncoder() {
  
  
  
          boolean result = true;
  
  
  
          // Open a container
  
          mPositionInMicroseconds = 0;
  
          mOutputContainer = IContainer.make();
  
          mOutputContainer.open(mOutputFileName, IContainer.Type.WRITE, null);
  
  
  
          // Create the video stream and get its coder
  
          ICodec videoCodec = ICodec.findEncodingCodec(ICodec.ID.CODEC_ID_H264);
  
          IStream videoStream = mOutputContainer.addNewStream(videoCodec);
  
          mVideoEncoder = videoStream.getStreamCoder();
  
  
  
          // Setup the stream coder
  
          mFrameRate = IRational.make(1, 30);
  
          mVideoEncoder.setWidth(Constants.RESAMPLE_PICT_WIDTH);
  
          mVideoEncoder.setHeight(Constants.RESAMPLE_PICT_HEIGHT);
  
          mVideoEncoder.setFrameRate(mFrameRate);
  
          mVideoEncoder.setTimeBase(IRational.make(mFrameRate.getDenominator(),
  
                                    mFrameRate.getNumerator()));
  
          mVideoEncoder.setBitRate(350000);
  
          mVideoEncoder.setNumPicturesInGroupOfPictures(30);
  
          mVideoEncoder.setPixelType(IPixelFormat.Type.YUV420P);
  
          mVideoEncoder.setFlag(IStreamCoder.Flags.FLAG_QSCALE, true);
  
          mVideoEncoder.setGlobalQuality(0);
  
  
  
          // Open the encoder
  
          mVideoEncoder.open(null, null);
  
  
  
          // Write the header
  
          mOutputContainer.writeHeader();
  
  
  
          return result;
  
      }
  
  
  
      public void Record() {
  
  
  
          picture = GetNextPicture();
  
          image = Utils.videoPictureToImage(picture);
  
          // convert to the right image type
  
          BufferedImage bgrScreen = ConvertToType(image, BufferedImage.TYPE_3BYTE_BGR);
  
          IConverter converter = ConverterFactory.createConverter(bgrScreen, mVideoEncoder.getPixelType());
  
          IVideoPicture frame = converter.toPicture(bgrScreen, mPositionInMicroseconds);
  
          frame.setQuality(0);
  
  
  
          IPacket packet = IPacket.make();
  
          int offset = 0;
  
          while (offset < frame.getSize()) {
  
              int bytesEncoded = mVideoEncoder.encodeVideo(packet, frame, offset);
  
              if (bytesEncoded < 0) {
  
                  throw new RuntimeException("Unable to encode video.");
  
              }
  
              offset += bytesEncoded;
  
  
  
              if (packet.isComplete()) {
  
                  System.out.println("Packet is complete");
  
                  if (mOutputContainer.writePacket(packet) < 0) {
  
                      throw new RuntimeException(
  
                              "Could not write packet to container.");
  
                  }
  
  
  
                  // Update frame time
  
                  mPositionInMicroseconds += (mFrameRate.getDouble() * Math.pow(1000, 2));
  
                  break;
  
              }
  
          }
  
      }
  
  
  
      public void Cleanup() {
  
  
  
          if (mOutputContainer != null) {
  
              mOutputContainer.writeTrailer();
  
              mOutputContainer.close();
  
              // mOutputContainer.flushPackets();
  
          }
  
  
  
          if (mVideoEncoder != null) {
  
              mVideoEncoder.close();
  
          }
  
      }
  
  }

• Invoking ffmpeg command line from C#

  17 juillet 2014, par hyde

  I have a bunch of images in a directory that I want to make a video out of.

  For example the images could have the following path :

  C:\dirpath with spaces\a.tiff

  C:\dirpath with spaces\b.tif

  C:\dirpath with spaces\c.tif

  ...

  C:\dirpath with spaces\zzz.tif

  (the file names themselves do not have a pattern)

  And ffmpeg is invoked in the server (ASP.Net WebAPI) when a user submits a query.

  Right now I am having a hard time getting it to work because part of the problem might be how I am passing the file names to ffmpeg.

  The command I am using is :

  ffmpeg -y -pix_fmt rgb24 -s 640x540 -framerate 24 -i "C:\dirpath with spaces\a.tif" "C:\dirpath with spaces\b.tif" "C:\dirpath with spaces\c.tif" ... "C:\dirpath with spaces\zzz.tif" -an out.mp4

  The problem is that the resulting video is 0 seconds long and ffmpeg does not throw any error.

  My question is, is how do I make this work while working with a set of images using their full path, maybe using a wrapper library around it ?

• Symfony PHP-FFMPEG (pulse00/ffmpeg-bundle) doesn't work

  8 juillet 2014, par harisK92

  I installed pulse00/ffmpeg-bundle

  and set it up like in documentation

  dubture_f_fmpeg:
  
      ffmpeg_binary:  C:\FFMPEG\bin\ffmpeg
  
      ffprobe_binary: C:\FFMPEG\bin\ffprobe

  But I got errors

  Unable to load FFProbe

  ..\vendor\php-ffmpeg\php-ffmpeg\src\FFMpeg\Driver\FFProbeDriver.php at line 50

      try { 
  
     }       return static::load($binaries, $logger, $configuration); 
  
     catch (BinaryDriverExecutableNotFound $e) { 
  
          throw new ExecutableNotFoundException('Unable to load FFProbe', $e->getCode(), $e); 
  
      } 
  
  } 

  When I add .exe

  dubture_f_fmpeg:
  
      ffmpeg_binary:  C:\FFMPEG\bin\ffmpeg.exe
  
      ffprobe_binary: C:\FFMPEG\bin\ffprobe.exe
  
  
  
     Unable to probe C:\Users\XXX\XXX\ProjectFolder\src\vendor\Bundle\Entity/../../../../web/uploads/videos/e4cbef010c42d819fd6c326011fb2434c4b43c68.mp4

  Code in my controller

  private  function getThumbnail(Video $videoObject)
  
      {
  
          $ffmpeg=$this->getFFMPEG();
  
          $video=$ffmpeg->open($videoObject->getAbsolutePath());
  
          $video->frame(FFMpeg\Coordinate\TimeCode::fromSeconds(10))
  
                ->save($videoObject->getImagesUploadDir().'/'."image.jpg");
  
  
  
      }