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• Use Matroska document version 2 for WebM files if possible.

  12 mai 2014, par Carl Eugen Hoyos

  Use Matroska document version 2 for WebM files if possible.
  Google’s plugin for the Internet Explorer refuses to play
  
  files with another document version.
  Fixes ticket #3583.
  

  • [DH] libavformat/matroskaenc.c

• Big problems while compiling FFMPEG for iOS5

  7 juin 2013, par Vlad Bogdan

  I'm trying to compile the ffmpeg library for iOS5. I tried different options but none works.

  I downloaded this : https://github.com/ciphor/ffmpeg4ios .

  I tried the original build_armv7 but it didn't work. I edited the build_arm7 file and now it looks like this :

  #!/bin/tcsh -f
  
  
  
  if (! -d armv7) mkdir armv7
  
  if (! -d lib) mkdir lib
  
  
  
  rm armv7/*.a
  
  
  
  make clean
  
  
  
  ./configure --disable-network --disable-mpegaudio-hp --disable-lpc --disable-vaapi 
  
  --disable-vdpau --disable-hwaccels --disable-mmx --disable-mmx2 --disable-sse 
  
  --disable-ssse3 --disable-avx --disable-amd3dnow --disable-amd3dnowext --disable-vis 
  
  --disable-mmi --disable-doc --disable-yasm --disable-ffmpeg --disable-ffplay 
  
  --disable-ffprobe --disable-ffserver --disable-rdft --disable-dxva2 --disable-encoders 
  
  --disable-decoders --enable-decoder=h264 --disable-bsfs --disable-protocols 
  
  --disable-indevs --disable-outdevs --disable-devices --disable-filters --disable-demuxers --enable-demuxer=h264 
  
  --disable-muxers --disable-parsers --enable-parser=h264 --enable-cross-compile --arch=arm 
  
  --target-os=darwin 
  
  --cc=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin10-llvm-gcc-4.2 --as='gas-preprocessor/gas-preprocessor.pl /Aplications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin10-llvm-gcc-4.2' 
  
  --sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk --cpu=cortex-a8 
  
  --extra-cflags='-pipe -Os -gdwarf-2 -issysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk -m${thumb_opt:-no-thumb} 
  
  -mthumb-interwork' --extra-ldflags='-arch armv7 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk' --enable-pic
  
  
  
  
  
  make
  
  
  
  mv libavcodec/libavcodec.a armv7/
  
  mv libavdevice/libavdevice.a armv7/
  
  mv libavformat/libavformat.a armv7/
  
  mv libavutil/libavutil.a armv7/
  
  mv libswscale/libswscale.a armv7/
  
  
  
  rm lib/*.a
  
  
  
  cp armv7/*.a lib/

  But i get this error :

  /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin10-llvm-gcc-4.2 is unable to create an executable file.
  C compiler test failed.

  I looked all over the Internet. I have read all the posts on stackoverflow about this but none helped me. Please tell me what i'm doing wrong and please don't post me links : trust me, i saw them all !

• Building FFmpeg for Android

  13 juin 2013, par varevarao

  I've spent almost a week on this now, trying to get FFmpeg "Angel"/"Happiness" to build for Android.
  I've tried build scripts from all over the internet to no avail. I got closest was using this. As the author himself says the script doesn't work for newer versions of FFmpeg due to this bug, which has been dismissed on that ticket saying "I found a Makefile that does it." This was dis-heartening, being the only post on all of the vast Google world that was anywhere close to my problem.
  So, question time :

  Is there a way to get around the above bug ? I'm trying to use the newest ffmpeg API, and "Love" is just giving me "undefined reference" errors while trying to use av_encode_video2(), and av_free_frame(). The code I was working on the lines of is at the ffmpeg git repo, under /doc/examples/decoding_encoding.c (the function starting on line 338).

  Update : So they've done away with codec_names.sh in "Angel". Sorry didn't notice that before, but the problem persists in a different avatar now. With every build attempt the compiler throws a certain

  start ndk-building...
  
  /home/<user>/android-ndk/build/core/build-binary.mk:41: *** target file `clean&#39; has both : and :: entries.  Stop.
  
  </user>

  Say whatnow !?