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• Android-NDK building using the Bambuser source

  13 juillet 2015, par Kenny910

  I am trying to use the FFmpeg source provided by the Bambuser.

  However, I am fail to build the files

  I get the following error :

  arm-linux-androideabi-gcc is unable to create an executable file.
  C compiler test failed.

  I have already set the NDK path to /home/android-ndk but still get this error

  And I am using Android-NDK-r5b

  can anyone help ? THX

  Here is my build.sh

  #!/bin/bash
  
  
  
  if [ "$NDK" = "" ]; then
  
      echo NDK variable not set, assuming ${HOME}/android-ndk
  
      export NDK=${HOME}/android-ndk
  
  fi
  
  
  
  SYSROOT=$NDK/platforms/android-3/arch-arm
  
  # Expand the prebuilt/* path into the correct one
  
  TOOLCHAIN=`echo $NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows`
  
  export PATH=$TOOLCHAIN/bin:$PATH
  
  
  
  rm -rf build/ffmpeg
  
  mkdir -p build/ffmpeg
  
  cd ffmpeg
  
  
  
  # Don't build any neon version for now
  
  for version in armv5te armv7a; do
  
  
  
      DEST=../build/ffmpeg
  
      FLAGS="--target-os=linux --cross-prefix=arm-linux-androideabi- --arch=arm"
  
      FLAGS="$FLAGS --sysroot=$SYSROOT"
  
      FLAGS="$FLAGS --soname-prefix=/data/data/com.streaming.realive/lib/"
  
      FLAGS="$FLAGS --enable-shared --disable-symver"
  
      FLAGS="$FLAGS --enable-small --optimization-flags=-O2"
  
      FLAGS="$FLAGS --enable-encoder=mpeg4 --enable-decoder=mpeg4"
  
      FLAGS="$FLAGS --enable-encoder=mpeg2video --enable-encoder=nellymoser"
  
      FLAGS="$FLAGS --enable-protocol=rtp --enable-protocol=rtmp"
  
      FLAGS="$FLAGS --enable-protocol=http --enable-protocol=tcp --enable-protocol=udp"
  
      FLAGS="$FLAGS --enable-protocol=file"
  
  
  
      case "$version" in
  
          neon)
  
              EXTRA_CFLAGS="-march=armv7-a -mfloat-abi=softfp -mfpu=neon"
  
              EXTRA_LDFLAGS="-Wl,--fix-cortex-a8"
  
              # Runtime choosing neon vs non-neon requires
  
              # renamed files
  
              ABI="armeabi-v7a"
  
              ;;
  
          armv7a)
  
              EXTRA_CFLAGS="-march=armv7-a -mfloat-abi=softfp"
  
              EXTRA_LDFLAGS=""
  
              ABI="armeabi-v7a"
  
              ;;
  
          *)
  
              EXTRA_CFLAGS=""
  
              EXTRA_LDFLAGS=""
  
              ABI="armeabi"
  
              ;;
  
      esac
  
      DEST="$DEST/$ABI"
  
      FLAGS="$FLAGS --prefix=$DEST"
  
  
  
      mkdir -p $DEST
  
      echo $FLAGS --extra-cflags="$EXTRA_CFLAGS" --extra-ldflags="$EXTRA_LDFLAGS" > $DEST/info.txt
  
      ./configure $FLAGS --extra-cflags="$EXTRA_CFLAGS" --extra-ldflags="$EXTRA_LDFLAGS" | tee $DEST/configuration.txt
  
      [ $PIPESTATUS == 0 ] || exit 1
  
      make clean
  
      make -j4 || exit 1
  
      make install || exit 1
  
  
  
  done

• ffmpeg +libx264 iPhone -> 'avcodec_encode_video' return always 0 . please advice

  2 janvier 2014, par isaiah

                   av_register_all();

          AVCodec *codec ;
          AVCodecContext *c= NULL ;
          int  out_size, size, outbuf_size ;
          //FILE *f ;
          uint8_t *outbuf ;
          printf("Video encoding\n") ;
          /* find the mpeg video encoder */
  
          codec =avcodec_find_encoder(CODEC_ID_H264) ;//avcodec_find_encoder_by_name("libx264") ; //avcodec_find_encoder(CODEC_ID_H264) ;//CODEC_ID_H264) ;
  
          NSLog(@"codec = %i",codec) ;
  
          if (!codec) 
  
              fprintf(stderr, "codec not found\n") ;
  
              exit(1) ;
  
             
  
  c= avcodec_alloc_context() ;
          /* put sample parameters */
  
          c->bit_rate = 400000 ;
  
          c->bit_rate_tolerance = 10 ;
  
          c->me_method = 2 ;
  
          /* resolution must be a multiple of two */
  
          c->width = 352 ;//width ;//352 ;
  
          c->height = 288 ;//height ;//288 ;
  
          /* frames per second */
  
          c->time_base= (AVRational)1,25 ;
  
          c->gop_size = 10 ; /* emit one intra frame every ten frames */
  
          //c->max_b_frames=1 ;
  
          c->pix_fmt = PIX_FMT_YUV420P ;
          c ->me_range = 16 ;
  
          c ->max_qdiff = 4 ;
  
          c ->qmin = 10 ;
  
          c ->qmax = 51 ;
  
          c ->qcompress = 0.6f ;
  

  'avcodec_encode_video' is always 0 .

  I guess that because 'non-strictly-monotonic PTS' warning, do you konw same situation ?

• Read PCM data from a compressed file in GridFS

  14 août 2012, par user1599160

  I need to get a iterable of pcm frames from a file in GridFs.

  I think the problem can be reduced to first reading the whole file from gridfs to memory and then decoding that to PCM.

  I have read up on using subprocess and pipes with ffmpeg, and there is a project called audio-reader that does this but with file arguments to ffmpeg, not with audio data from memory.

  There is a library called pymedia but it is from 2006 and only works with outdated ffmpeg.

  How should I proceed, also if you are going to sugest ffmpeg with subprocess and pipes, please give me some example code, maybe it is just late, but I finding the python docs on subprocess confusing...