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• osx ffmpeg avfoundation audio not in sync

  29 avril 2015, par Chris Whittington

  I’m trying to record my screen audio and video with ffmpeg. I have installed soundflower successfully and setup the correct audio devices. However, when using ffmpeg the audio is sped up and does not keep in sync with the video.

  ffmpeg -f avfoundation -i "1:0" -y out.avi

  I have also tried the following variations.

  ffmpeg -vsync 2 -f avfoundation -i "1:0" -framerate 30 -y out.avi
  
  
  
  ffmpeg -vsync 2 -f avfoundation -i "1:0" -frame_rate 30 -probesize 10M  -y out.avi
  
  
  
  ffmpeg -async 1 -probesize 10M -f avfoundation -i "1:0" -r 15  -y out.avi
  
  
  
  ffmpeg -async 15 -f avfoundation -i "1:0" -r 15  -y out.avi

  I’m using ffmpeg version 2.6.2 installed via homebrew.

  If someone has a free solution that isn’t ffmpeg that works well from the command line then i will also accept that. Quicktime screen recording produces very large file sizes so it’s not appropriate.

• Errors while ffmpeg compiling

  10 mai 2012, par iSun

  I trying to compile ffmpeg through the following script, but I got errors while compiling : (Using windows 7 - android ndk 7rb and cygwin)

  s@s-PC /cygdrive/f/export/ffmpeg-0.8.10
  
  $ ./setup.sh
  
  F:/Compiler/android-ndk-r7b/toolchains/arm-linux-androideabi-4.4.3/prebuilt/wind                                                                                                    ows/bin/arm-linux-androideabi-gcc is unable to create an executable file.
  
  C compiler test failed.
  
  
  
  If you think configure made a mistake, make sure you are using the latest
  
  version from Git.  If the latest version fails, report the problem to the
  
  ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
  
  Include the log file "config.log" produced by configure as this will help
  
  solving the problem.
  
  ./setup.sh: line 48: --extra-cflags=: command not found
  
  ./setup.sh: line 51: --extra-ldflags=: command not found
  
  ./setup.sh: line 53: --extra-ldflags=: command not found
  
  Makefile:1: config.mak: No such file or directory
  
  libavutil/Makefile:1: libavutil/../config.mak: No such file or directory
  
  libavutil/../subdir.mak:96: warning: overriding recipe for target `libavutil/'
  
  libavutil/../subdir.mak:26: warning: ignoring old recipe for target `libavutil/'
  
  libavutil/../subdir.mak:96: warning: overriding recipe for target `libavutil/'
  
  libavutil/../subdir.mak:96: warning: ignoring old recipe for target `libavutil/'
  
  Makefile:239: /tests/fate.mak: No such file or directory
  
  Makefile:240: /tests/fate2.mak: No such file or directory
  
  Makefile:242: /tests/fate/aac.mak: No such file or directory
  
  Makefile:243: /tests/fate/als.mak: No such file or directory
  
  Makefile:244: /tests/fate/fft.mak: No such file or directory
  
  Makefile:245: /tests/fate/h264.mak: No such file or directory
  
  Makefile:246: /tests/fate/mp3.mak: No such file or directory
  
  Makefile:247: /tests/fate/vorbis.mak: No such file or directory
  
  Makefile:248: /tests/fate/vp8.mak: No such file or directory
  
  make: *** No rule to make target `/tests/fate/vp8.mak'.  Stop.
  
  Makefile:1: config.mak: No such file or directory
  
  libavutil/Makefile:1: libavutil/../config.mak: No such file or directory
  
  libavutil/../subdir.mak:96: warning: overriding recipe for target `libavutil/'
  
  libavutil/../subdir.mak:26: warning: ignoring old recipe for target `libavutil/'
  
  libavutil/../subdir.mak:96: warning: overriding recipe for target `libavutil/'
  
  libavutil/../subdir.mak:96: warning: ignoring old recipe for target `libavutil/'
  
  Makefile:239: /tests/fate.mak: No such file or directory
  
  Makefile:240: /tests/fate2.mak: No such file or directory
  
  Makefile:242: /tests/fate/aac.mak: No such file or directory
  
  Makefile:243: /tests/fate/als.mak: No such file or directory
  
  Makefile:244: /tests/fate/fft.mak: No such file or directory
  
  Makefile:245: /tests/fate/h264.mak: No such file or directory
  
  Makefile:246: /tests/fate/mp3.mak: No such file or directory
  
  Makefile:247: /tests/fate/vorbis.mak: No such file or directory
  
  Makefile:248: /tests/fate/vp8.mak: No such file or directory
  
  make: *** No rule to make target `/tests/fate/vp8.mak'.  Stop.

  Here is my script :

      #!/bin/bash
  
  
  
      export TMPDIR=C:/cygwin/tmp
  
  
  
      ANDROID_API=android-8
  
      export ANDROID_NDK=F:/Compiler/android-ndk-r7b
  
      export ANDROID_SDK=F:/Compiler/android-sdk
  
      SYSROOT=$ANDROID_NDK/platforms/$ANDROID_API/arch-arm
  
      ANDROID_BIN=$ANDROID_NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin
  
      CROSS_COMPILE=${ANDROID_BIN}/arm-linux-androideabi-
  
      export PATH=$PATH:$ANDROID_SDK/tools:$ANDROID_SDK/platform-tools
  
  
  
      export ARM_ROOT=$ANDROID_NDK
  
      export ARM_INC=$ARM_ROOT/platforms/android-5/arch-arm/usr/include
  
      export ARM_LIB=$ARM_ROOT/platforms/android-5/arch-arm/usr/lib
  
      export LIB_INC=${HOME}/include
  
      export LIB_LIB=${HOME}/lib
  
  
  
  
  
      CFLAGS=" -I$ARM_INC -fPIC -DANDROID -fpic -mthumb-interwork -ffunction-sections -funwind-tables -fstack-protector -fno-short-enums -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__  -Wno-psabi -march=armv5te -mtune=xscale -msoft-float -mthumb -Os -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64 -DANDROID  -Wa,--noexecstack -MMD -MP "
  
      LDFLAGS=" -nostdlib -Bdynamic  -Wl,--no-undefined -Wl,-z,noexecstack  -Wl,-z,nocopyreloc -Wl,-soname,/system/lib/libz.so -Wl,-rpath-link=$ARM_LIB,-dynamic-linker=/system/bin/linker -L$ARM_LIB -nostdlib $ARM_LIB/crtbegin_dynamic.o $ARM_LIB/crtend_android.o -lc -lm -ldl -lgcc "
  
  
  
      FLAGS="--target-os=linux 
  
      --enable-cross-compile 
  
      --cross-prefix=$CROSS_COMPILE 
  
      --arch=arm --prefix=$HOME 
  
      --disable-shared 
  
      --enable-static 
  
      --extra-libs=-static 
  
      --extra-cflags=--static 
  
      --enable-small 
  
      --disable-asm 
  
      --disable-yasm 
  
      --disable-amd3dnow 
  
      --disable-amd3dnowext 
  
      --disable-mmx 
  
      --disable-mmx2 
  
      --disable-sse 
  
      --disable-ssse3 
  
      --disable-indevs"
  
  
  
  
  
      export CFLAGS=$EXTRA_CFLAGS
  
      export LDFLAGS=$EXTRA_LDFLAGS
  
  
  
  
  
  ./configure $FLAGS 
  
  --extra-cflags="$CFLAGS" 
  
  --extra-ldflags="$LDFLAGS" \
  
  --cc="${CROSS_COMPILE}gcc 
  
  --sysroot=${SYSROOT}" 
  
  --extra-ldflags="$LDFLAGS" \
  
  --cxx="${CROSS_COMPILE}g++ --sysroot=${SYSROOT}" \
  
  --nm="${CROSS_COMPILE}nm" \
  
  --ar="${CROSS_COMPILE}ar"
  
  
  
  
  
  make clean
  
  make -j4 || exit 1
  
  make install || exit 1

  Any ideas ?

• sws : move the early return for zero-sized slices higher up

  21 mai 2021, par Anton Khirnov

  sws : move the early return for zero-sized slices higher up
  Place it right after the input parameter validation. There is no point
  
  in performing any setup if the sws_scale() call won't do anything.
  

  • [DH] libswscale/swscale.c