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• Conversion from Iphone Core Surface RGB Frame into ffmepg AVFarme

  10 mars 2015, par Raghu

  I am trying to convert Core Surface RGB frame buffer(Iphone) to ffmpeg Avfarme to encode into a movie file. But I am not getting the correct video output (video showing colors dazzling not the correct picture)

  I guess there is something wrong with converting from core surface frame buffer into AVFrame.

  Here is my code :

  Surface *surface = [[Surface alloc]initWithCoreSurfaceBuffer:coreSurfaceBuffer];
  
  [surface lock];
  
  unsigned int height = surface.height;
  
  unsigned int width = surface.width;
  
  unsigned int alignmentedBytesPerRow = (width * 4);
  
  if (!readblePixels) {
  
      readblePixels = CGBitmapAllocateData(alignmentedBytesPerRow * height);
  
      NSLog(@"alloced readablepixels");
  
  }
  
  unsigned int bytesPerRow = surface.bytesPerRow;
  
  void *pixels = surface.baseAddress;
  
  for (unsigned int j = 0; j < height; j++) {
  
      memcpy(readblePixels + alignmentedBytesPerRow * j, pixels + bytesPerRow * j, bytesPerRow);
  
  }
  
  
  
  pFrameRGB->data[0] = readblePixels; // I guess here is what I am doing wrong.
  
  pFrameRGB->data[1] = NULL;
  
  pFrameRGB->data[2] = NULL;
  
  pFrameRGB->data[3] = NULL;
  
  
  
  pFrameRGB->linesize[0] = pCodecCtx->width;
  
  pFrameRGB->linesize[1] = 0;
  
  pFrameRGB->linesize[2] = 0;
  
  pFrameRGB->linesize[3] = 0;
  
  
  
  
  
  sws_scale (img_convert_ctx, pFrameRGB->data, pFrameRGB->linesize,
  
         0, pCodecCtx->height,
  
         pFrameYUV->data, pFrameYUV->linesize);   

  Please help me out.

  Thanks,

  Raghu

• How to stop ffmpeg automatically rotating (Iphone 13) videos

  22 juillet 2022, par VdGR

  I have a bunch of videos I want to merge into one video.
Therefore I used this ffmpeg command.

  


  ffmpeg -y -loglevel warning -f concat -safe 0  -i "filelist.txt" -c copy "merged.mov"


  


  When I open merged.mov all my videos are rotated -90 degerees but when I open my videos for example in vlc it has the right rotation.
What am I doing wrong ?

  


  I tried already adding the "-noautorotate" option but that does not seem to solve the problem.

  


• iPhone - FFMPEG/VLC audio stream for iOS

  24 avril 2013, par Siriss

  I am trying to write an app for a school project that will play a video stream of the lab. They use Foscam cameras, and from what I understand they only stream audio in FFMPEG and VLC (a wrapper of FFMPEG and others, correct ?). I can play the video stream in a UIWebView just fine, but I can't figure out how to get audio to work. I have read a bunch of post on here about the different audio stream options, but none support this format. I have also looked into VLCKit, but that seems to only work in OS X, not iOS.

  Is there a Framework, or Kit that can stream audio from a VLC/FFMPEG file, or does someone know of a better way to get audio from a Foscam ?