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• doc/general.texi : fix SDX2 description

  29 octobre 2015, par Paul B Mahol

  doc/general.texi : fix SDX2 description
  Signed-off-by : Paul B Mahol <onemda@gmail.com>
  

  • [DH] doc/general.texi

• Access violation reading location 0x000000148965F000

  14 février 2014, par user3012914

  I tried to encode BMP Images, which i get from a buffer and store it as a H264 Video. I am stuck with these errors the arrive randomly and repeatedly

  I am using Visual Studio 2012

  1) Access violation reading location 0x000000148965F000.

  2)Heap corruption

  The debug shows the error at this point

      struct SwsContext* fooContext = sws_getContext(_imgWidth,_imgHeight,PIX_FMT_RGB32,c->width,c->height,PIX_FMT_YUV420P, SWS_FAST_BILINEAR,NULL,NULL,NULL);
  
                      sws_scale(fooContext, inpic->data, inpic->linesize, 0, c->height, outpic->data, outpic->linesize);    // converting frame size and format

  I guess the read violation happens due to non - pre initialized values. But i couldnt exactly understand why. I have also attached part of the code below

  PagedImage *inImg = getUpdatedInputImage(0);
  
          ML_CHECK(inImg);
  
          ImageVector imgExt = inImg->getImageExtent();
  
          if ((imgExt.x == _imgWidth) && (imgExt.y == _imgHeight))
  
          {
  
              if (((imgExt.x % 4) == 0) && ((imgExt.y % 4) == 0))
  
              {
  
                 _numFramesFld->setIntValue(_numFramesFld->getIntValue() + 1);
  
                  MLFree(unicodeFilename);
  
                  // configure header
  
                  //BITMAPINFO bitmapInfo
  
                  // read out input image and write output image into video
  
                  // get input image as an array
  
                  void* imgData = NULL;
  
                  SubImageBox imageBox(imgExt); // get the whole image
  
                  getTile(inImg, imageBox, MLuint8Type, &imgData);
  
                  MLuint8* iData = (MLuint8*)imgData;
  
                  // since we have only images with
  
                  // a z-ext of 1, we can compute the c stride as follows
  
                  int cStride = _imgWidth * _imgHeight;
  
                  int offset  = 0;
  
                  MLuint8 r=0, g=0, b=0;
  
                  // pointer into the bitmap that is
  
                  // used to write images into an video
  
                  UCHAR* dst = (UCHAR*)_bits;
  
                  for (int y = _imgHeight-1; y >= 0; y--)
  
                  { // reversely scan the image. if y-rows of DIB are set in normal order, no compression will be available.
  
                      offset = _imgWidth * y;
  
                      for (int x = 0; x < _imgWidth; x++)
  
                      {
  
                          if (_isGreyValueImage)
  
                          {
  
                              r = iData[offset + x];
  
                              *dst++ = (UCHAR)r;
  
                              *dst++ = (UCHAR)r;
  
                              *dst++ = (UCHAR)r;
  
                          } 
  
                          else
  
                          {
  
                              b = iData[offset + x]; // windows bitmap need reverse order: bgr instead of rgb
  
                              g = iData[offset + x + cStride          ];
  
                              r = iData[offset + x + cStride + cStride];
  
                              *dst++ = (UCHAR)r;
  
                              *dst++ = (UCHAR)g;
  
                              *dst++ = (UCHAR)b;
  
                          }
  
                          // alpha channel in input image is ignored
  
                      }
  
                  }
  
                  outbuf_size = 100000 + c->width*c->height*(32>>3);      // allocate output buffer
  
                  outbuf = static_cast(malloc(outbuf_size));
  
                  fileName_ = (_outputFilenameFld->getStringValue()).c_str();
  
                  FILE* f = fopen(fileName_,"wb");                    // opening video file for writing
  
                  if(!f)
  
                  {
  
                      _messageFld->setStringValue("Cannot open file");
  
                  }
  
                  else _messageFld->setStringValue("Opened video file for writing\n");
  
  
  
                  //for(i=0;i<_numFramesFld->getIntValue();i++)
  
                  //{
  
                      fflush(stdout);
  
                      int nbytes = avpicture_get_size(PIX_FMT_YUV420P, c->width, c->height);                                // allocating outbuffer
  
                      uint8_t* outbuffer = (uint8_t*)av_malloc(nbytes*sizeof(uint8_t));
  
                      AVFrame* inpic = avcodec_alloc_frame();                                                               // mandatory frame allocation
  
                      AVFrame* outpic = avcodec_alloc_frame();
  
                      //outpic->pts = (int64_t)((float)i * (1000.0/((float)(c->time_base.den))) * 90);                        // setting frame pts
  
                      avpicture_fill((AVPicture*)inpic,(uint8_t*)dst, PIX_FMT_RGB32, c->width, c->height);                            // fill image with input screenshot
  
                      avpicture_fill((AVPicture*)outpic, outbuffer, PIX_FMT_YUV420P, c->width, c->height);                  // clear output picture for buffer copy
  
                      av_image_alloc(outpic->data, outpic->linesize, c->width, c->height, c->pix_fmt, 1); 
  
  
  
                      inpic->data[0] += inpic->linesize[0]*(c->height-1);                                                   // flipping frame
  
                      inpic->linesize[0] = -inpic->linesize[0];                                                             // flipping frame
  
  
  
                      struct SwsContext* fooContext = sws_getContext(_imgWidth,_imgHeight,PIX_FMT_RGB32,c->width,c->height,PIX_FMT_YUV420P, SWS_FAST_BILINEAR,NULL,NULL,NULL);
  
                      sws_scale(fooContext, inpic->data, inpic->linesize, 0, c->height, outpic->data, outpic->linesize);    // converting frame size and format
  
                      out_size = avcodec_encode_video(c, outbuf, outbuf_size, outpic);                                      // encoding video
  
                      _messageFld->setStringValue("Encoding frame %3d (size=%5d)\n");
  
                       fwrite(outbuf, 1, out_size, f);
  
                       delete [] dst;                                                                                         // freeing memory
  
                      av_free(outbuffer);     
  
                      av_free(inpic);
  
                      av_free(outpic);
  
                      av_free(fooContext);
  
                      DeleteObject(_hbitmap);
  
  
  
                      for(int Z = 0; Z/ encode the delayed frames
  
                          fwrite(outbuf, 1, out_size, f);
  
                      }
  
                      //outbuf[0] = 0x00;
  
                      //outbuf[1] = 0x00;                                                                                               // add sequence end code to have a real mpeg file
  
                      //outbuf[2] = 0x01;
  
                      //outbuf[3] = 0xb7;
  
                      //fwrite(outbuf, 1, 4, f);
  
                      fclose(f);
  
                      avcodec_close(c);                                                                                               // freeing memory
  
                      free(outbuf);
  
                      av_free(c);
  
                      printf("Closed codec and Freed\n");
  
                  }
  
              }

• How to use ffmpeg with laravel 5.7 on a shared hosting with limited resources/access

  29 novembre 2018, par DestinyB

  I have search through different forums and online resources on how I can use ffmpeg on my laravel 5.7 application on a shared host but have not gotten any solution. I actually installed ffmpeg on my project following the instructions from this link How to Install FFMPEG in Laravel.

  I also downloaded the binary files and save them to my local drive C :// in my system with windows 8.1 Operating System. Then I connected my binary as show bellow ;

    $ffprobe = FFMpeg\FFProbe::create([
  
          'ffmpeg.binaries'  => 'C:/FFmpeg/bin/ffmpeg.exe', // the path to the FFMpeg binary
  
          'ffprobe.binaries' => 'C:/FFmpeg/bin/ffprobe.exe', // the path to the FFProbe binary
  
          'timeout'          => 3600, // the timeout for the underlying process
  
          'ffmpeg.threads'   => 12,   // the number of threads that FFMpeg should use
  
      ]);

  I also did the path setting in the system environmental variables settings and everything was working great while serving the website from XAMPP Server.

  The problem I have is that I have uploaded the project to a shared host that I dont have access to check if they have the ffmpeg on the server or not and the host provider could not really give me a helpful information about that. So, I uploaded the binary files into a folder in my filemanger on the cpanel and named it "binary files". Then I changed my codes as given bellow ;

  $ffmpeg = FFMpeg\FFMpeg::create([
  
          'ffmpeg.binaries'  => '/home/username/binary_files/bin/ffmpeg.exe', // the path to the FFMpeg binary
  
          'ffprobe.binaries' => '/home/username/binary_files/bin/ffprobe.exe',  // the path to the FFProbe binary
  
          'timeout'          => 3600, // the timeout for the underlying process
  
          'ffmpeg.threads'   => 1,   // the number of threads that FFMpeg should use
  
      ]);

  But still I get error that Unable to load FFProbe as shown in this Image from the code

      public static function create($configuration, LoggerInterface $logger = null)
  
  {
  
      if (!$configuration instanceof ConfigurationInterface) {
  
          $configuration = new Configuration($configuration);
  
      }
  
  
  
      $binaries = $configuration->get('ffprobe.binaries', array('avprobe', 'ffprobe'));
  
  
  
      try {
  
          return static::load($binaries, $logger, $configuration);
  
      } catch (BinaryDriverExecutableNotFound $e) {
  
          throw new ExecutableNotFoundException('Unable to load FFProbe', $e->getCode(), $e);
  
      }
  
  }

  The major thing I am doing on my project is to convert video into proper encoded streaming video as well as automatically generate a .png or .jpg thumbnail from the video while uploading. So in case if there is an alternative other than ffmpeg to solve this or anyone that have use the ffmpeg library on a shared hosted before should help.
  Please !