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• Add mp3 file sound in the middle of the mp4/avi/mpeg [on hold]

  17 novembre 2014, par user1018697

  I tryed to do something, and i meet some diffulties to do :

  1- i have a little movie file of 1 minutes ( movie.mp4)

  2- i have an mp3 file of 10 seconds (voice.mp3)

  I whish to add this mp3 file in the middle of my film (at 30 seconds).
  My question is :
  Is it possible create simply a new video (movie2.mp4) with my mp3 added in the middle of the film (at 30 s) ?
  Or maybe is exist a c# library or c++ to do this ?

  Thanks

• 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

• What to input for variable frame rate in pts / dts in ffmpeg

  23 novembre 2014, par William

  I am capturing frames from a webcam stream which sends frames in at a variable rate. My output video plays much faster than it was captured because there are less frames available than the input fps.

  I’m really new to ffmpeg and don’t know what to put into pts and dts. I can get an Int64 representing nanoseconds since 1600 when the frame arrives. How do I use the av_rescale_q function with it ?

  Reading online it seems a solution may be to clone frames so the output fits into a constant frame rate video. However it would be better just to put the timestamp in there.