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• configure : Use pkg-config for fdk-aac

  10 mai 2015, par Luca Barbato

  configure : Use pkg-config for fdk-aac
  Makes the life of the people already setting PKG_CONFIG_PATH simpler.
  

  • [DH] configure

• FFMPEG - errors when combining videos

  1er décembre 2012, par ethrbunny

  I have two .OGG files of similar size, FPS and duration. My goal is to combine them into a side-by-side presentation using FFMPEG. To this end I've tried the following cmd :

  ffmpeg -i subject.ogg -vf "[in]pad=3*iw:3*ih[left] ;movie=clinician.ogg[right] ;[left] [right]overlay=100:0[out]" combined.ogg

  Suffice to say that the resultant video is non-playable. During the combination process FFMPEG prints lots of errors that read like :

  [Parsed_overlay_2 @ 0x1eb7d3e0] Buffer queue overflow, dropping

  What is this telling me ?

  Note :

  • both source files are playable
  • I padded the 'output' to be rather large in an attempt to understand the params
  • the placement of the 2nd video at 100:0 is arbitrary. Once I get the cmd working I'll move it to a better location in the output.
  • both videos began life as .FLV recorded from web cameras. I converted them to .ogg as FFMPEG didn't want to combine two .FLV files. If there is a better route to this, please let me know.

  So - what's wrong with my parameters and what am I doing to cause these FFMPEG errors ?

  EDIT :
  ffmpeg -i clinician.ogg

  Input #0, ogg, from 'clinician.ogg' :
  Duration : 00:05:20.98, start : 0.001000, bitrate : 2273 kb/s
  Stream #0:0 : Video : theora, yuv420p, 500x500 [SAR 1:1 DAR 1:1], 1k tbr, 1k tbn, 1k tbc
  Metadata :
  SERVER : Red5 Server 1.0.0 RC1 $Rev : 4193 $
  CANSEEKTOEND : true
  ENCODER : Lavf54.31.100
  Stream #0:1 : Audio : vorbis, 8000 Hz, stereo, s16
  Metadata :
  SERVER : Red5 Server 1.0.0 RC1 $Rev : 4193 $
  CANSEEKTOEND : true
  ENCODER : Lavf54.31.100

  ffmpeg -i subject.ogg

  Input #0, ogg, from 'subject.ogg' :
  Duration : 00:05:17.60, start : 0.001000, bitrate : 1341 kb/s
  Stream #0:0 : Video : theora, yuv420p, 300x300 [SAR 1:1 DAR 1:1], 83.33 tbr, 1k tbn, 1k tbc
  Metadata :
  SERVER : Red5 Server 1.0.0 RC1 $Rev : 4193 $
  CANSEEKTOEND : true
  ENCODER : Lavf54.31.100
  Stream #0:1 : Audio : vorbis, 8000 Hz, stereo, s16
  Metadata :
  SERVER : Red5 Server 1.0.0 RC1 $Rev : 4193 $
  CANSEEKTOEND : true
  ENCODER : Lavf54.31.100

• ffmpeg on iOS 5.1 Undefined Symbols Error

  25 avril 2012, par AndyDunn

  So I've spent several hours now working through the scant amount of information available online about building ffmpeg for iOS. The building process seems to work well and I end up with fat files for armv6 and armv7 which I drag over into my project.

  However, whenever I try to use the "avcodec_init()" command I get the following error :

  Undefined symbols for architecture armv7 :
  "_avcodec_init", referenced from :

   -[FirstViewController viewDidLoad] in FirstViewController.o

  ld : symbol(s) not found for architecture armv7

  clang : error : linker command failed with exit code 1 (use -v to see invocation)

  The library files are included in the 'Link Binary with Libraries' of the project settings, so they are definitely compiled into the app. I just can't for the life of me work out why I'm getting an error on this.

  I've tried several different projects, and downloaded some existing project files from the web and get the same error.

  This is the build script I used :

  export PLATFORM="iPhoneOS" export MIN_VERSION="4.0" export
  MAX_VERSION="5.1" export
  DEVROOT=/Volumes/Lion/Applications/Xcode.app/Contents/Developer/Platforms/$PLATFORM.platform/Developer
  export SDKROOT=$DEVROOT/SDKs/$PLATFORM$MAX_VERSION.sdk export
  CC=$DEVROOT/usr/bin/llvm-gcc export LD=$DEVROOT/usr/bin/ld export
  CPP=$DEVROOT/usr/bin/cpp export CXX=$DEVROOT/usr/bin/llvm-g++ export
  AR=$DEVROOT/usr/bin/ar export LIBTOOL=$DEVROOT/usr/bin/libtool export
  NM=$DEVROOT/usr/bin/nm export CXXCPP=$DEVROOT/usr/bin/cpp export
  RANLIB=$DEVROOT/usr/bin/ranlib

  COMMONFLAGS="-pipe -gdwarf-2 -no-cpp-precomp -isysroot $SDKROOT
  -marm -fPIC" export LDFLAGS="$COMMONFLAGS -fPIC" export CFLAGS="$COMMONFLAGS -fvisibility=hidden" export
  CXXFLAGS="$COMMONFLAGS -fvisibility=hidden
  -fvisibility-inlines-hidden"

  FFMPEG_LIBS="libavcodec libavdevice libavformat libavutil libswscale"

  echo "Building armv6..."

  make clean ./configure \
  —cpu=arm1176jzf-s \
  —extra-cflags='-arch armv6 -miphoneos-version-min=$MIN_VERSION -mthumb' \
  —extra-ldflags='-arch armv6 -miphoneos-version-min=$MIN_VERSION' \
  —enable-cross-compile \
  —arch=arm \
  —target-os=darwin \
  —cc=$CC \
  —sysroot=$SDKROOT \
  —prefix=installed \
  —disable-network \
  —disable-decoders \
  —disable-muxers \
  —disable-demuxers \
  —disable-devices \
  —disable-parsers \
  —disable-encoders \
  —disable-protocols \
  —disable-filters \
  —disable-bsfs \
  —enable-decoder=h264 \
  —enable-decoder=svq3 \
  —enable-gpl \
  —enable-pic \
  —disable-doc perl -pi -e 's/HAVE_INLINE_ASM 1/HAVE_INLINE_ASM 0/' config.h make -j3

  mkdir -p build.armv6 for i in $FFMPEG_LIBS ; do cp ./$i/$i.a
  ./build.armv6/ ; done

  echo "Building armv7..."

  make clean ./configure \
  —cpu=cortex-a8 \
  —extra-cflags='-arch armv7 -miphoneos-version-min=$MIN_VERSION -mthumb' \
  —extra-ldflags='-arch armv7 -miphoneos-version-min=$MIN_VERSION' \
  —enable-cross-compile \
  —arch=arm \
  —target-os=darwin \
  —cc=$CC \
  —sysroot=$SDKROOT \
  —prefix=installed \
  —disable-network \
  —disable-decoders \
  —disable-muxers \
  —disable-demuxers \
  —disable-devices \
  —disable-parsers \
  —disable-encoders \
  —disable-protocols \
  —disable-filters \
  —disable-bsfs \
  —enable-decoder=h264 \
  —enable-decoder=svq3 \
  —enable-gpl \
  —enable-pic \
  —disable-doc perl -pi -e 's/HAVE_INLINE_ASM 1/HAVE_INLINE_ASM 0/' config.h make -j3

  mkdir -p build.armv7 for i in $FFMPEG_LIBS ; do cp ./$i/$i.a
  ./build.armv7/ ; done

  mkdir -p build.universal for i in $FFMPEG_LIBS ; do lipo -create
  ./build.armv7/$i.a ./build.armv6/$i.a -output ./build.universal/$i.a ;
  done

  for i in $FFMPEG_LIBS ; do cp ./build.universal/$i.a ./$i/$i.a ; done

  make install