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• iOS Recorded Video Playback on Android

  1er mars 2015, par Nirav

  I am trying to record video from iPhone device using UIImagePickerController and able to store it in MP4 format. The same video is uploaded on the Amazon S3 cloud.

  When I try to play the same video on Android devices, it fails to play with an error, cannot play.

  I searched forums/google and found that ffmpeg should be used to compress the video before uploading. I want to do the compression on the phone itself rather than on the server. Which is the best way to achieve this ?

  Regards,

  Nirav

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

  12 janvier 2013, par 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 ?

• ffmpeg ios, decoding rtsp stream causes memory leak

  5 août 2013, par 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);