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• how to fix the delay when play a ts stream via udp

  4 June 2013, by user2223169

  I want to play udp ts stream on iPhone using ffmepg, but the video delayed almost 1s, so my question is how to fix the delay, currently I think I can specify the fifo_size, just like udp://@:1234?fifo_size=1024, but the player can't play with this configuration, anybody knows how to reduce the buffer size to reduce the delay ?
  Thanks :)

• ffmpeg ios, decoding rtsp stream causes memory leak

  5 August 2013, by Simone M

  i have an ios application that stream a rtsp video via network using ffmpeg library.
  In random time i have a crash without error message, the only message in console is "Memory warning".
  Using instrument i detect some memory leaks, this link a screenshot about error: http://vincentvega.it/iphone/video.png, i think the problem is in the point of code where i make uiimage to show on screen:

  - (void)convertFrameToRGB
  
  {
  
      sws_scale(img_convert_ctx,
  
                pFrame->data,
  
                pFrame->linesize,
  
                0,
  
                pCodecCtx->height,
  
                picture.data,
  
                picture.linesize);
  
  
  
  }
  
  
  
  - (UIImage *)imageFromAVPicture:(AVPicture)pict width:(int)width height:(int)height
  
  {
  
      CGBitmapInfo bitmapInfo = kCGBitmapByteOrderDefault;
  
      CFDataRef data = CFDataCreateWithBytesNoCopy(kCFAllocatorDefault, pict.data[0], pict.linesize[0]*height,kCFAllocatorNull);
  
      CGDataProviderRef provider = CGDataProviderCreateWithCFData(data);
  
      CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
  
      CGImageRef cgImage = CGImageCreate(width, 
  
                                         height, 
  
                                         8, 
  
                                         24, 
  
                                         pict.linesize[0], 
  
                                         colorSpace, 
  
                                         bitmapInfo, 
  
                                         provider, 
  
                                         NULL, 
  
                                         NO, 
  
                                         kCGRenderingIntentDefault);
  
      CGColorSpaceRelease(colorSpace);
  
      UIImage *image = [[UIImage alloc] initWithCGImage:cgImage];
  
  
  
  
  
  
  
      return [image autorelease];
  
  }

  how can i detect the function that causes memory problem?

  SOLVED! I just neeed to add the following code in "imagefromavcapture":

  CGImageRelease(cgImage);
  
      CGDataProviderRelease(provider);
  
      CFRelease(data);

• how to add a text stream (subtitle) into a .mp4 or .m4v

  12 January 2013, by jAckOdE

  I use ffmpeg to convert video using H264 for video encoding, and FAAC for audio encoding. The output should be .mp4 or m4v in order to play on both Android and iPhone. I want to add a subtitle STREAM to video file using ffmpeg, but the ffmpeg's documentation doesnt help much.

  Can anyone help me with this?