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• How to extract orientation information from MOV videos created on the iPhone using ffmeg, ruby or objectivec ?

  5 octobre 2014, par Sid

  After surfing through tons of documentation on the web it seems that the iPhone always shoots the video at a 480x360 aspect ratio and applies a transformation matrix on the video track. (480x360 may change but its always the same for a given device)

  Here is a way of modifying the ffmpeg source within a iOS project and accessing the matrix http://www.seqoy.com/correct-orientation-for-iphone-recorded-movies-with-ffmpeg/

  Here is a cleaner way of finding the transformation matrix in iOS-4
  how to detect (iphone sdk) if a video file was recorded in portrait orientation, or landscape

  How can the orientation of the video be extracted in either of the options below -
  
   iOS 3.2
  
   ffmpeg (through the command line server side)
  
   ruby
  

  Any help will be appreciated.

• video playing sample on iPhone using libffmpeg

  6 mai 2014, par deimus

  can someone please provide a reference or an example on usage of libffmpeg library for playing video files not supported by apple.

  Let consider mkv file.
  I suppose the library decodes and passes the raw media data to AVFoundation objects to play it on device. Am I right ?

• compiling ffmpeg for iPhone SDK 4.3 [error : is unable to create an executable file.]

  12 février 2012, par user509020

  Like many others.. I'm compiling ffmpeg using gas preprocessor

  http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2009-October/077701.html

  This is my command

  ./configure --cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin10-gcc-4.2.1 --as='gas-preprocessor.pl /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin10-gcc-4.2.1' --sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk --enable-cross-compile --target-os=darwin --arch=arm7 --cpu=cortex-a8 --enable-pic

  the error :

  /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin10-gcc-4.2.1 is unable to create an executable file.
  
  C compiler test failed.

  I looked up the /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/ folder using Finder..
  arm-apple-darwin10-gcc-4.2.1 was there..

  Thanks,
  Suhas