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• ffmpeg - convert audio (.au) to mp3

  8 mai 2014, par enfix

  i’m using ffmpeg (on Ubuntu) to convert a .au file to .mp3. File mp3 is created but have 0 byte.
  That’s my output :

  $ ffmpeg -i 12345678.au output.mp3 
  
  
  
  ffmpeg version 2.1.4 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on May  7 2014 01:40:43 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
    configuration: 
  
    libavutil      52. 48.101 / 52. 48.101
  
    libavcodec     55. 39.101 / 55. 39.101
  
    libavformat    55. 19.104 / 55. 19.104
  
    libavdevice    55.  5.100 / 55.  5.100
  
    libavfilter     3. 90.100 /  3. 90.100
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
  Guessed Channel Layout for  Input Stream #0.0 : mono
  
  Input #0, au, from '12345678.au':
  
    Duration: 00:00:02.05, start: 0.000000, bitrate: 128 kb/s
  
      Stream #0:0: Audio: pcm_s8 ([2][0][0][0] / 0x0002), 16000 Hz, mono, u8, 128 kb/s
  
  Output #0, mp3, to 'output.mp3':
  
      Stream #0:0: Audio: none, 0 channels, 128 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (pcm_s8 -> ?)
  
  Encoder (codec none) not found for output stream #0:0

  The .au file is correct and I can open correctly. The .mp3 file is 0 byte or maybe corrupted (VLC can’t play it).

• FFMPEG stops with muxing overhead of 20538950942720.000000% after takeoff command is sent to AR.Drone 2.0

  7 mai 2014, par user38931

  I start ffmpeg -i tcp://192.168.1.1:5555 -f image2 -pix_fmt bgr8 -update 1 frame.bmp to decode a h264 stream from AR.Drone 2.0. Everything works fine, until I send a takeoff command to the drone and it lifts up. For those who are not familiar with AR.Drone 2.0 architecture, the commands are sent to another socket and shouldn’t interfere with the video socket.

  Then for some reason, ffmpeg stops with a muxing overhead of insane 20538950942720.000000% !

  Are there common causes for such a crazy muxing overhead ?
  I would like to know what could cause such a massive muxing overhead, before I can move on to troubleshoot what the source of the problem is.

  Here is the full output I have :

  ffmpeg -i tcp://192.168.1.1:5555 -f image2 -pix_fmt bgr8 -update 1 frame.bmp
  
  ffmpeg version N-62058-gfd2bcfc Copyright (c) 2000-2014 the FFmpeg developers
  
  built on Apr  3 2014 05:12:32 with gcc 4.6 (Debian 4.6.3-1)
  
  configuration: --prefix=/root/ffmpeg-static/32bit --arch=x86_32 --extra-cflags='-m32 -I/root/ffmpeg-static/32bit/include -static' --extra-ldflags='-m32 -L/root/ffmpeg-static/32bit/lib -static' --extra-libs='-lxml2 -lexpat -lfreetype' --enable-static --disable-shared --disable-ffserver --disable-doc --enable-bzlib --enable-zlib --enable-postproc --enable-runtime-cpudetect --enable-libx264 --enable-gpl --enable-libtheora --enable-libvorbis --enable-libmp3lame --enable-gray --enable-libass --enable-libfreetype --enable-libopenjpeg --enable-libspeex --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-version3 --enable-libvpx
  
    libavutil      52. 71.100 / 52. 71.100
  
    libavcodec     55. 56.107 / 55. 56.107
  
    libavformat    55. 36.101 / 55. 36.101
  
    libavdevice    55. 11.100 / 55. 11.100
  
    libavfilter     4.  3.100 /  4.  3.100
  
    libswscale      2.  6.100 /  2.  6.100
  
    libswresample   0. 18.100 /  0. 18.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, h264, from 'tcp://192.168.1.1:5555':
  
    Duration: N/A, bitrate: N/A
  
    Stream #0:0: Video: h264 (Baseline), yuv420p, 640x360, 25 fps, 25 tbr, 1200k tbn, 50 tbc
  
  [swscaler @ 0xb21e600] No accelerated colorspace conversion found from yuv420p to bgr8.
  
  Output #0, image2, to 'frame.bmp':
  
    Metadata:
  
      encoder         : Lavf55.36.101
  
      Stream #0:0: Video: bmp, bgr8, 640x360, q=2-31, 200 kb/s, 90k tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> bmp)
  
  Press [q] to stop, [?] for help
  
  frame=  388 fps= 29 q=0.0 Lsize=N/A time=00:00:15.52 bitrate=N/A    
  
  video:87708kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 20538950942720.000000%

• Compile FFmpeg with librtmp ERROR : librtmp not found

  10 juin 2014, par 谢小进

  Environment : Mac OS X 10.9.2, Xcode 5.1.

  I have compiled librtmp, libogg and libspeex successfully, they are in the directories named fat-librtmp, fat-libogg and fat-libspeex , then I run the shell script as below to coompile them into FFmpeg :

  #!/bin/sh
  
  
  
  # OS X Mavericks, Xcode 5.1
  
  
  
  set -ex
  
  
  
  VERSION="2.2.2"
  
  CURRPATH=`pwd`
  
  DSTDIR="ffmpeg-built"
  
  SCRATCH="scratch"
  
  LIBRTMP=$CURRPATH/librtmp
  
  ARCHS="i386 x86_64 armv7 armv7s arm64"
  
  
  
  CONFIGURE_FLAGS="--enable-shared \
  
                  --disable-doc \
  
                  --disable-stripping \
  
                  --disable-ffmpeg \
  
                  --disable-ffplay \
  
                  --disable-ffserver \
  
                  --disable-ffprobe \
  
                  --disable-decoders \
  
                  --disable-encoders \
  
                  --disable-protocols \
  
                  --enable-protocol=file \
  
                  --enable-protocol=rtmp \
  
                  --enable-librtmp \
  
                  --enable-encoder=flv \
  
                  --enable-decoder=flv \
  
                  --disable-symver \
  
                  --disable-asm \
  
                  --enable-cross-compile"
  
  
  
  rm -rf $DSTDIR
  
  mkdir $DSTDIR
  
  
  
  if [ ! `which yasm` ]; then
  
      if [ ! `which brew` ]; then
  
          ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)"
  
      fi
  
      brew install yasm
  
  fi
  
  
  
  if [ ! `which gas-preprocessor.pl` ]; then
  
      curl -3L https://github.com/libav/gas-preprocessor/raw/master/gas-preprocessor.pl -o /usr/local/bin/gas-preprocessor.pl
  
      chmod +x /usr/local/bin/gas-preprocessor.pl
  
  fi
  
  
  
  if [ ! -e ffmpeg-$VERSION.tar.bz2 ]; then
  
      curl -O http://www.ffmpeg.org/releases/ffmpeg-$VERSION.tar.bz2
  
  fi
  
  
  
  tar jxf ffmpeg-$VERSION.tar.bz2
  
  
  
  
  
  export PKG_CONFIG_PATH="/usr/local/lib/pkgconfig:$PKG_CONFIG_PATH"
  
  export LD_LIBRARY_PATH="/usr/local/lib:$LD_LIBRARY_PATH"
  
  
  
  for ARCH in $ARCHS; do
  
      mkdir -p $DSTDIR/$SCRATCH/$ARCH
  
      cd $DSTDIR/$SCRATCH/$ARCH
  
  
  
      CFLAGS="-arch $ARCH"
  
      if [ $ARCH == "i386" -o $ARCH == "x86_64" ]; then
  
          PLATFORM="iPhoneSimulator"
  
          CFLAGS="$CFLAGS -mios-simulator-version-min=6.0"
  
      else
  
          PLATFORM="iPhoneOS"
  
          CFLAGS="$CFLAGS -mios-version-min=6.0"
  
          if [ $ARCH == "arm64" ]; then
  
              EXPORT="GASPP_FIX_XCODE5=1"
  
          fi
  
      fi
  
  
  
      XCRUN_SDK=`echo $PLATFORM | tr '[:upper:]' '[:lower:]'`
  
      CC="xcrun -sdk $XCRUN_SDK clang"
  
      CFLAGS="$CFLAGS -I$LIBRTMP/include"
  
      CXXFLAGS="$CFLAGS"
  
      LDFLAGS="$CFLAGS -L$LIBRTMP/lib"
  
  
  
      $CURRPATH/ffmpeg-$VERSION/configure \
  
      --target-os=darwin \
  
      --arch=$ARCH \
  
      --cc="$CC" \
  
      $CONFIGURE_FLAGS \
  
      --extra-cflags="$CFLAGS" \
  
      --extra-cxxflags="$CXXFLAGS" \
  
      --extra-ldflags="$LDFLAGS" \
  
      --prefix=$CURRPATH/$DSTDIR/$ARCH
  
  
  
      make -j3 install $EXPORT
  
  
  
      cd $CURRPATH
  
  done
  
  
  
  rm -rf $DSTDIR/$SCRATCH
  
  mkdir -p $DSTDIR/lib
  
  cd $DSTDIR/$ARCH/lib
  
  LIBS=`ls *.a`
  
  cd $CURRPATH
  
  
  
  for LIB in $LIBS; do
  
      lipo -create `find $DSTDIR -name $LIB` -output $DSTDIR/lib/$LIB
  
  done
  
  
  
  cp -rf $DSTDIR/$ARCH/include $DSTDIR
  
  
  
  for ARCH in $ARCHS; do
  
      rm -rf $DSTDIR/$ARCH
  
  done

  Unluckily, the config.log shows :

  check_pkg_config librtmp librtmp/rtmp.h RTMP_Socket
  
  pkg-config --exists --print-errors librtmp
  
  Package librtmp was not found in the pkg-config search path.
  
  Perhaps you should add the directory containing `librtmp.pc'
  
  to the PKG_CONFIG_PATH environment variable
  
  No package 'librtmp' found
  
  ERROR: librtmp not found

  I have googled and knew that configure contains a line enabled librtmp  && require_pkg_config librtmp librtmp/rtmp.h RTMP_Socket, which maybe be wrong. Right ? Can somebody help me to solve it ?

  UPDATE at 2014/06/10

  I think it’s about pkgconfig or something, so I have create a file named librtmp.pc at /usr/local/lib/pkgconfig, which contains below text :

  prefix=/usr/local/librtmp
  
  exec_prefix=${prefix}
  
  libdir=${prefix}/lib
  
  includedir=${prefix}/include
  
  
  
  Name: librtmp
  
  Description: RTMP implementation
  
  Version: v2.3
  
  Requires:
  
  URL: http://rtmpdump.mplayerhq.hu
  
  Libs: -L${libdir} -lrtmp -lz
  
  Cflags: -I${includedir}

  Also I have moved built librtmp to /usr/local. After above being done, I run the shell script again, but still same error ! Can somebody told me why and how to solve it ?