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• How to download/convert multiple streams to multiple outputs with FFmpeg ?

  16 avril 2016, par Website Newbie

  Let’s say I have 20 different online stream videos (playlist.m3u8) and I want every video to output to their own .avi files. How can I do that in single file, so I don’t have to download and convert every single one separately ?

  I found a -map command online, but didn’t get straight answer to this.

  Will this be a working code ?

  ffmpeg -i 1playlist.m3u8 -vf scale=768:-1 -vcodec libx264 -crf 24 -acodec copy -map 0 1.avi \
  
  -i 2playlist.m3u8 -vf scale=768:-1 -vcodec libx264 -crf 24 -acodec copy -map 1 2.avi \
  
  -i 3playlist.m3u8 -vf scale=768:-1 -vcodec libx264 -crf 24 -acodec copy -map 2 3.avi

• How create with ffmpeg a *.mov file which could be opened in default WMP ?

  22 mai 2016, par xiaose

  How create MOV, QuickTime Movie (.mov) which could be opened in default Windows Media Player ? Actually, smth. like this : http://cdn.online-convert.com/example-file/video/mov/example.mov

  I have files MPEG-1 or MPEG-2 and want to convert it with ffmpeg to the mov. Sure, I can write smth. like this :

  ffmpeg -i in.mpg -level 3.1 -vformat mpeg4 -qscale 1 -f mov out.mov

  ...and this will be Ok. But I need resulting file which will be correct MOV but, may be, without mpeg4 in it and played in WMP without installing any additional codecs

• 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");
  
                  }
  
              }