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• How to compile ffmpeg for an iphone application

  27 décembre 2012, par Swati

  I am trying to compile ffmpeg for my iphone app so that i can convert amr file to mp3

  I downloaded latest version of ffmpeg and tried to configure it via terminal on my mac.

  but i couldn't succeed, it always shows numerous errors :

  cannot find make command
  
  
  
  /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc is unable to create an executable file.
  
  
  
  libavcodec.a    file not found
  
  libavfilter.a   file not found
  
  libavutil.a     file not found
  
  libswscale.a    file not found
  
  libavdevice.a   file not found
  
  libavformat.a   file not found
  
  libswresample.a file not found

  i tried following links :
  FFmpeg on iPhone

  FFmpeg on iPhone

  Using FFMPEG library with iPhone SDK for video encoding

  and many more...

  could not fins step by step instructions..
  Hope somebody can guide me with ffmpeg config

• How can i save a iphone uploaded video always horizontal by ffmpeg

  24 juillet 2013, par Ranjith Reddy

  I am using FFMPEG for uploading recording video from iphone and generating frames.

  case1 : recording video in horizontal (generating video and frames in horizontal).

  case2 : recording video in vertical (generating video and frames in vertical).

  But in above 2 case i want video and frames in horizontal only.

  FFMPEG COMMAND

  %x(cd "#{tmp_path}" && ffmpeg -i "video path" -r 1 -f image2 image-%4d.jpeg )

• how to configure ffmpeg to transplant to iphone sdk 5.1 simulator and play h264 ?

  19 décembre 2012, par user1204703

  I use lastest "ffmpeg-1.0.1" and "ffmpeg-iphone-build",to transplant fffmpeg to iphone sdk 5.1 simulator.

  and use the build-i386 script in the "ffmpeg-iphone-build" project . also I add "—enable-decoder=h264" to the "CONFIGURE_OPTIONS".

  just this :

  CONFIGURE_OPTIONS="--enable-gpl --enable-postproc --enable-swscale --enable-avfilter --disable-asm --enable-cross-compile --enable-decoder=h264"

  then execute "./build-i386".
  and I also execute below batch :

  #!/bin/tcsh -f
  
  
  
  mkdir universal
  
  
  
  mkdir lib
  
  
  
  
  
  mkdir i386
  
  
  
  
  
  mv ffmpeg-i386/libavcodec/libavcodec.a i386/
  
  
  
  mv ffmpeg-i386/libavdevice/libavdevice.a i386/
  
  
  
  mv ffmpeg-i386/libavformat/libavformat.a i386/
  
  
  
  mv ffmpeg-i386/libavutil/libavutil.a i386/
  
  
  
  mv ffmpeg-i386/libswscale/libswscale.a i386/
  
  
  
  
  
  
  
  rm universal/*.a
  
  
  
  lipo -create -arch i386 i386/libavcodec.a -output universal/libavcodec.a
  
  
  
  lipo -create -arch i386 i386/libavdevice.a -output universal/libavdevice.a
  
  
  
  lipo -create -arch i386 i386/libavformat.a -output universal/libavformat.a
  
  
  
  lipo -create -arch i386 i386/libavutil.a -output universal/libavutil.a
  
  
  
  lipo -create -arch i386 i386/libswscale.a -output universal/libswscale.a
  
  
  
  rm lib/*.a
  
  
  
  cp universal/*.a lib/

  then I use the "iFreameExtractor" demo, modify the video file to "test.h264".
  code like :

  - (void)applicationDidFinishLaunching:(UIApplication *)application {    
  
      self.video = [[VideoFrameExtractor alloc] initWithVideo:[Utilities bundlePath:@"test.h264"]];
  
  }

  then run with IPhone 5.1 Simulator.
  but, fail with error :

  [h264 @ 0x91f1800] max_analyze_duration 5000000 reached at 5019130
  
  [h264 @ 0x91f1800] Estimating duration from bitrate, this may be inaccurate
  
  [swscaler @ 0x9203600] No accelerated colorspace conversion found from yuv420p to rgb24.
  
  2012-12-19 20:19:54.419 iFrameExtractor[52708:f803] video duration: -9223372036854.775391

  I think that the reason why it can not play h264 file that when I transplant the fffmpeg to the iphone simulator, and maybe do something wrong with the configure options.
  but I do not know how to fix it.

  Can you show the correct configure or other advices ?

  Thanks for your reply ??
  I am going to crash.