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• Convert video with FFMPEG Library in android

  27 septembre 2012, par Sanat Pandey

  I have a problem that I received a video foile from the server which can not be played throgh video view from the app I am making. I don't know what the actaul problem is because all videos are played through same video view but the video received from the server side is not played. So, I think that I have to integrate FFMPEG in our android app, so I can play every video at a runtime conversion. For this I have read much more about FFMPEG Library integration with android through many sites as :

  http://www.roman10.net/how-to-build-android-applications-based-on-ffmpeg-by-an-example/

  Downloaded some projects from GitHUb (https://github.com/appunite/AndroidFFmpeg) but unable to succeed for building the Library through NDK. Some thing I missed and I am working on Windows machine, probably this might be a problem. I want the exact solution regarding this, means step by step solution for building the android project with FFMPEG Library. If you have some useful suggestion then please share with me.

  Thanks in advance.

• 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 !

• How to limit the backward dependency between coded frames in ffmpeg/x264

  26 mars 2015, par Bastian35022

  I am currently playing with ffmpeg + libx264, but i couldn’t find a way to limit the backward dependency between coded frames.

  Let me explain what i mean : I want the coded frames to only contain references to at most, let’s say, 5 frames in the future. As a result, no frame has to "wait" for more than 5 frames to be coded (makes sense for low latency applications).

  I am aware of the -tune zerolatency option, but that’s not what i want ; I still want bidirectional prediction.