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• Specified sample format s16 is invalid or not supported

  20 avril 2015, par user2955351

  I am encoding PCM data to AAC format using ffmpeg :
  Following is my code to setup the context object :

  -(id)encode:(short*)data{
  
      AVCodecContext  *audioCodec;
  
      AVCodec *codec;
  
  
  
      avcodec_register_all();
  
  
  
      //Set up audio encoder
  
      codec = avcodec_find_encoder(AV_CODEC_ID_AAC);
  
      if (codec == NULL){
  
          NSLog(@"no codec");
  
       }
  
      audioCodec = avcodec_alloc_context3(codec);
  
      audioCodec->strict_std_compliance = -2;
  
      audioCodec->bit_rate = 64000;
  
      audioCodec->sample_fmt = AV_SAMPLE_FMT_S16;
  
      audioCodec->sample_rate = 8000;
  
      audioCodec->channels = 2;
  
      audioCodec->profile = FF_PROFILE_AAC_MAIN;
  
      audioCodec->time_base = (AVRational){1, 8000};
  
      audioCodec->codec_type = 1;
  
      if (avcodec_open2(audioCodec, codec, NULL)) {
  
          NSLog(@"could not open codec");
  
  
  
      }
  
       return @"NO";
  
  }

  I always get an error log as :
  aac @ 0x151cda00] Specified sample format s16 is invalid or not supported

  If I don’t provide any sample format, I get the same log :
  aac @ 0x151cda00] Specified sample format -1 is invalid or not supported

  and that’s why avcodec_open2() gives log of could not open codec ;

  Can some 1 tell me what is the issue ?

  ffmpeg compilation script is as follows :

  #!/bin/sh
  
  
  
  # directories
  
  SOURCE="ffmpeg"
  
  FAT="fat"
  
  VERSION="2.0.2"
  
  
  
  SCRATCH="scratch"
  
  # must be an absolute path
  
  THIN=`pwd`/"thin"
  
  
  
  # absolute path to x264 library
  
  #X264=`pwd`/fat_x264
  
  
  
  CONFIGURE_FLAGS="--enable-cross-compile \
  
      --disable-network \
  
      --disable-encoders  \
  
      --disable-decoders \
  
      --disable-muxers \
  
      --disable-demuxers \
  
      --disable-protocols \
  
      --disable-devices \
  
      --disable-ffmpeg \
  
      --disable-ffplay \
  
      --disable-ffprobe \
  
      --disable-ffserver \
  
      --disable-avdevice \
  
      --disable-avfilter \
  
      --disable-iconv \
  
      --disable-bzlib \
  
      --disable-mmx \
  
      --disable-mmxext \
  
      --disable-amd3dnow \
  
      --disable-amd3dnowext \
  
      --disable-sse \
  
      --disable-sse2 \
  
      --disable-sse3 \
  
      --disable-sse4 \
  
      --disable-avx \
  
      --disable-fma4 \
  
      --disable-swresample \
  
      --disable-postproc \
  
      --disable-bsfs \
  
      --disable-filters \
  
      --disable-asm \
  
      --disable-yasm \
  
      --disable-debug \
  
      --disable-doc \
  
      --disable-armv5te \
  
      --disable-armv6 \
  
      --disable-armv6t2 \
  
      --enable-protocol=file \
  
      --enable-avformat \
  
      --enable-avcodec \
  
      --enable-swscale \
  
      --enable-demuxer=mp3 \
  
      --enable-demuxer=aac \
  
      --enable-demuxer=image2 \
  
      --enable-demuxer=mov \
  
      --enable-decoder=rawvideo \
  
      --enable-demuxer=h263 \
  
      --enable-demuxer=h264 \
  
      --enable-decoder=mp3 \
  
      --enable-decoder=aac \
  
      --enable-decoder=mjpeg \
  
      --enable-decoder=h263 \
  
      --enable-decoder=h264 \
  
      --enable-decoder=mpeg4 \
  
      --enable-encoder=mp3 \
  
      --enable-encoder=aac \
  
      --enable-encoder=mjpeg \
  
      --enable-encoder=h263 \
  
      --enable-encoder=h264 \
  
      --enable-encoder=mpeg4 \
  
      --enable-parser=mp3 \
  
      --enable-parser=aac \
  
      --enable-parser=h264 \
  
      --enable-pic"
  
  
  
  if [ "$X264" ]
  
  then
  
      CONFIGURE_FLAGS="$CONFIGURE_FLAGS --enable-gpl --enable-libx264"
  
  fi
  
  
  
  # avresample
  
  #CONFIGURE_FLAGS="$CONFIGURE_FLAGS --enable-avresample"
  
  
  
  ARCHS="arm64 armv7s armv7 x86_64 i386"
  
  
  
  COMPILE="y"
  
  LIPO="y"
  
  
  
  DEPLOYMENT_TARGET="6.0"
  
  
  
  if [ "$*" ]
  
  then
  
      if [ "$*" = "lipo" ]
  
      then
  
          # skip compile
  
          COMPILE=
  
      else
  
          ARCHS="$*"
  
          if [ $# -eq 1 ]
  
          then
  
              # skip lipo
  
              LIPO=
  
          fi
  
      fi
  
  fi
  
  
  
  if [ "$COMPILE" ]
  
  then
  
      CWD=`pwd`
  
      for ARCH in $ARCHS
  
      do
  
          echo "building $ARCH..."
  
          mkdir -p "$SCRATCH/$ARCH"
  
          cd "$SCRATCH/$ARCH"
  
  
  
          CFLAGS="-arch $ARCH"
  
          if [ "$ARCH" = "i386" -o "$ARCH" = "x86_64" ]
  
          then
  
              PLATFORM="iPhoneSimulator"
  
              CFLAGS="$CFLAGS -mios-simulator-version-min=$DEPLOYMENT_TARGET"
  
          else
  
              PLATFORM="iPhoneOS"
  
              CFLAGS="$CFLAGS -mios-version-min=$DEPLOYMENT_TARGET"
  
              if [ "$ARCH" = "arm64" ]
  
              then
  
                  EXPORT="GASPP_FIX_XCODE5=1"
  
              fi
  
          fi
  
  
  
          XCRUN_SDK=`echo $PLATFORM | tr '[:upper:]' '[:lower:]'`
  
          CC="xcrun -sdk $XCRUN_SDK clang"
  
          CXXFLAGS="$CFLAGS"
  
          LDFLAGS="$CFLAGS"
  
          if [ "$X264" ]
  
          then
  
              CFLAGS="$CFLAGS -I$X264/include"
  
              LDFLAGS="$LDFLAGS -L$X264/lib"
  
          fi
  
  
  
          $CWD/$SOURCE/configure \
  
              --target-os=darwin \
  
              --arch=$ARCH \
  
              --cc="$CC" \
  
              $CONFIGURE_FLAGS \
  
              --extra-cflags="$CFLAGS" \
  
              --extra-cxxflags="$CXXFLAGS" \
  
              --extra-ldflags="$LDFLAGS" \
  
              --prefix="$THIN/$ARCH"
  
  
  
          make -j3 install $EXPORT
  
          cd $CWD
  
      done
  
  fi
  
  
  
  if [ "$LIPO" ]
  
  then
  
      echo "building fat binaries..."
  
      mkdir -p $FAT/lib
  
      set - $ARCHS
  
      CWD=`pwd`
  
      cd $THIN/$1/lib
  
      for LIB in *.a
  
      do
  
          cd $CWD
  
          lipo -create `find $THIN -name $LIB` -output $FAT/lib/$LIB
  
      done
  
  
  
      cd $CWD
  
      cp -rf $THIN/$1/include $FAT
  
  fi

• AAC ffmpeg encoding iOS [closed]

  16 avril 2013, par HighFlyingFantasy

  So I have spent most of the day writing an FFMPEG client for iOS, and I ran into a problem when trying to convert my hardware encoded h.264/aac mov file to h.264/aac flv. I borrowed the muxing.c example code and converted it to modern objective-c. I'm having problems with the aac encoder, which says...

  

  I would like to know if it's possible to either add the -strict -2 command at runtime, or compile the library with experimental encoders enabled ?
  Also, my library seems to be missing some encoders (i only tried speex and mp3). I compiled them with :

  ./configure \
  
  --prefix=armv7 \
  
  --disable-ffmpeg \
  
  --disable-ffplay \
  
  --disable-ffprobe \
  
  --disable-ffserver \
  
  --enable-avresample \
  
  --enable-cross-compile \
  
  --sysroot="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.1.sdk" \
  
  --target-os=darwin \
  
  --cc="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc" \
  
  --extra-cflags="-arch armv7 -mfpu=neon -miphoneos-version-min=6.1" \
  
  --extra-ldflags="-arch armv7 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.1.sdk -miphoneos-version-min=6.1" \
  
  --arch=arm \
  
  --cpu=cortex-a9 \
  
  --enable-pic 

  and other variations, depending on the architecture. If someone can offer insight to either of my problems, it would be greatly appreciated !

• Compile FFMpeg for Xcode 5 without GCC ?

  9 janvier 2014, par Joseph Toronto

  I'm trying to compile FFMpeg to add to my iOS app project in Xcode5, however since GCC is no longer included the ./configure script included with FFMpeg doesn't work. Unix/Linux is NOT my strong suit so I'm pretty much at a loss as to what to do next. I know I can install GCC manually, but if FFMpeg is compiled with GCC and the rest of my project is compiled with LLVC/Clang/whatever won't it cause problems. I did manage to install FFmpeg with Brew but I'm not sure what that even accomplished since it wasn't done using options flags like below :

  ./configure --prefix=armv7 --disable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --enable-avresample --enable-cross-compile --sysroot="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk" --target-os=darwin --cc="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc" --extra-cflags="-arch armv7 -mfpu=neon -miphoneos-version-min=6.1" --extra-ldflags="-arch armv7 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -miphoneos-version-min=6.1" --arch=arm --cpu=cortex-a9 --enable-pic

  None of the scripts/fixes I've tried work, even if they're advertised as working in IOS7/Xcode 5, because they all use GCC. What should I do ?