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• Errors compiling ffmpeg for iPhone

  20 juillet 2013, par simon.d

  I'm on OS X Lion and I'm trying to compile the armv7 libraries of ffmpeg for the iPhone. I'm using ffmpeg 0.10.

  Here's my configure line :

  ./configure --disable-doc --disable-ffmpeg --disable-ffplay --disable-ffserver --disable-ffprobe --enable-cross-compile --arch=arm --target-os=darwin --cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc --as='gas-preprocessor/gas-preprocessor.pl /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc' --sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk --cpu=cortex-a8 --extra-cflags='-arch armv7' --extra-ldflags='-arch armv7 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk' --enable-pic --disable-avdevice --disable-avfilter --disable-zlib --disable-bzlib

  Configure runs fine although it ends with : WARNING : Compiler does not indicate floating-point ABI, guessing soft.

  Here are my make results :

  Users-MacBook-Pro:ffmpeg-0.10 user$ make
  
  CC    libavformat/4xm.o
  
  CC    libavformat/a64.o
  
  CC    libavformat/aacdec.o
  
  CC    libavformat/ac3dec.o
  
  CC    libavformat/act.o
  
  CC    libavformat/adtsenc.o
  
  CC    libavformat/adxdec.o
  
  CC    libavformat/aea.o
  
  CC    libavformat/aiffdec.o
  
  CC    libavformat/aiffenc.o
  
  CC    libavformat/allformats.o
  
  CC    libavformat/amr.o
  
  CC    libavformat/anm.o
  
  CC    libavformat/apc.o
  
  CC    libavformat/ape.o
  
  CC    libavformat/apetag.o
  
  CC    libavformat/applehttp.o
  
  CC    libavformat/applehttpproto.o
  
  CC    libavformat/asf.o
  
  CC    libavformat/asfcrypt.o
  
  error: invalid operand in inline asm: 'ldr   ${0:Q}, $1 
  
      ldr   ${0:R}, $2 
  
      '
  
  make: *** [libavformat/asfcrypt.o] Error 1
  
  Users-MacBook-Pro:ffmpeg-0.10 user$

  Any ideas ? Thanks !

• how can I use the openCV FFMPEG video I/O rather than the DirectShow one in Windows ?

  2 mai 2012, par octi

  So I'm trying to write a video using the openCV videoWriter as such :

  writer=cv.CreateVideoWriter(path+"test_output.avi",-1,fps,(W,H),1)

  So instead of supplying the FOURCC I supplied -1 in order to see what codecs I have available.
  Result was Microsoft RLE, Microsoft Video 1, Intel YUV, and Uncompressed.

  The reason is that when configuring openCV using CMAKE for Visual Studio 10 x64, this is what I have in the video i/o :
  Video I/O : DirectShow

  Is there a way to switch this to FFMPEG ? I know the ffmpeg dll is present in \3dparty\ffmpeg.
  I looked for Cmake FFMPEG flags but found none whatsoever. The weird thing is in the CmakeLists.txt in the opencv root under the video section :

  if(UNIX AND NOT APPLE)
  
  <ffmpeg stuff="stuff">
  
  elseif(WIN32)
  
      status("  Video I/O:"        HAVE_VIDEOINPUT     THEN DirectShow ELSE NO)
  
  endif()
  
  </ffmpeg>

  So it seems to me that opencv automatically switched to DirectShow and gives no choice of using FFMpeg.
  Or rather can one upgrade Driectshow to support other formats such as Divx or h264 ?
  Any ideas ?

• FFMPEG iPhone using gas-preprocessor

  5 mars 2012, par user308990

  I got the latest version of FFMPEG and gas-preprocessor, and i am trying to build them libraries for iPhone. I put the gas-preprocessor.pl file in my usr/bin folder, and try to configure my ffmpeg with this command.

  ./configure —cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin9-gcc-4.2.1 —as='gas-preprocessor.pl /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin9-gcc-4.2.1' —sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.1.sdk —enable-cross-compile —target-os=darwin —arch=arm —cpu=cortex-a8 —enable-pic

  But what i get is this error

  Unknown option "—as=gas-preprocessor.pl".
  See ./configure —help for available options.

  Any ideas ??? Thank u.