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• configure : Use lowercase includes/library names for schannel check.

  8 mars 2016, par İsmail Dönmez

  configure : Use lowercase includes/library names for schannel check.
  Fixes cross-build on Linux with mingw-w64.
  Reviewed-by : Reimar Döffinger
  
  Reviewed-by : Hendrik Leppkes
  

  • [DH] configure

• compile FFmpeg error on windows when run ./configure

  5 novembre 2013, par user1325717

  I want to use FFmpeg to decode mp3 and acc on android, I use android-ndk-r7 and the newest cygwin.

  I wrote a shell config.sh, which content is :

  ---

  TMPDIR=/cygdrive/c/temp
  
  
  
  PREBUILT=/cygdrive/c/android-ndk-r7/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows
  
  PLATFORM=/cygdrive/c/android-ndk-r7/platforms/android-8/arch-arm
  
  
  
  ./configure --target-os=linux --arch=arm --enable-version3 --enable-gpl --enable-nonfree --disable-stripping --disable-ffmpeg --disable-ffplay --disable-ffserver --disable-ffprobe --disable-encoders --disable-muxers --disable-devices --disable-protocols --enable-protocol=file --enable-avfilter --disable-network --disable-mpegaudio-hp --disable-avdevice --enable-cross-compile --cc=$PREBUILT/bin/arm-linux-androideabi-gcc --cross-prefix=$PREBUILT/bin/arm-linux-androideabi- --nm=$PREBUILT/bin/arm-linux-androideabi-nm --extra-cflags="-fPIC -DANDROID" --disable-asm --enable-neon --enable-armv5te --extra-ldflags="-Wl,-T,$PREBUILT/arm-eabi/lib/ldscripts/armelf_linux_eabi.x -Wl,-rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -nostdlib $PREBUILT/lib/gcc/arm-linux-androideabi/4.4.3/crtbegin.o $PREBUILT/lib/gcc/arm-linux-androideabi/4.4.3/crtend.o -lc -lm -ldl"

  ---

  I open cmd and do bash to open cygwin shell, then do ./config, the problem is appeared :
  "/cygdrive/c/android-ndk-r7/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/arm-linux-androideabi-gcc is unable to create an executable file..."

  the config.log is :

  check_ld
  
  check_cc
  
  BEGIN /cygdrive/c/temp/ffconf.SFJc3t92.c
  
      1   int main(void){ return 0; }
  
  END /cygdrive/c/temp/ffconf.SFJc3t92.c
  
  gcc -fPIC -DANDROID -std=c99 -c -o /cygdrive/c/temp/ffconf.YKRv5TSp.o /cygdrive/c/temp/ffconf.SFJc3t92.c
  
  /cygdrive/c/temp/ffconf.SFJc3t92.c:1:0: warning: -fPIC ignored for target (all code is position independent)
  
  gcc -Wl,-rpath-link=/cygdrive/c/android-ndk-r7/platforms/android-4/arch-arm/usr/lib -L/cygdrive/c/android-ndk-r7/platforms/android-4/arch-arm/usr/lib -nostdlib /cygdrive/c/android-ndk-r7/platforms/android-4/arch-arm/usr/lib/crtbegin_static.o /cygdrive/c/android-ndk-r7/platforms/android-4/arch-arm/usr/lib/crtend_android.o -lc -lm -ldl -o /cygdrive/c/temp/ffconf.Yf1Ftjmo /cygdrive/c/temp/ffconf.YKRv5TSp.o
  
  /usr/lib/gcc/i686-pc-cygwin/4.5.3/../../../../i686-pc-cygwin/bin/ld: /cygdrive/c/android-ndk-r7/platforms/android-4/arch-arm/usr/lib/crtbegin_static.o: Relocations in generic ELF (EM: 40)
  
  /cygdrive/c/android-ndk-r7/platforms/android-4/arch-arm/usr/lib/crtbegin_static.o: could not read symbols: File in wrong format
  
  collect2: ld returned 1 exit status
  
  C compiler test failed.

  I don't know what is happened, is there someone who know what is happened, thanks.

• Create a glitch effect at arbitrary points in time using ffmpeg

  21 décembre 2020, par Soren Wray

  I know how to blend two videos into a single video of cross-fading clips with a glitch effect, e.g. every 2.7 seconds, with this command string :

  


  ffmpeg -i input1.mkv -i input2.mkv -filter_complex "[0][1]blend=all_expr='if(mod(trunc(T/2.7),2),min(1,2*(T-2.7*trunc(T/2.7))),max(0,4-8*(T-2.7*trunc(T/2.7))))*A+if(mod(trunc(T/2.7),2),max(0,4-8*(T-2.7*trunc(T/2.7))),min(1,2*(T-2.7*trunc(T/2.7))))*B';[0]volume='if(mod(trunc(t/2.7),2),min(1,2*(t-2.7*trunc(t/2.7))),max(0,4-8*(t-2.7*trunc(t/2.7))))':eval=frame[a]; [1]volume='if(mod(trunc(t/2.7),2),max(0,4-8*(t-2.7*trunc(t/2.7))),min(1,2*(t-2.7*trunc(t/2.7))))':eval=frame[b];[a][b]amix" output.mkv


  


  I would like a similar method, but for a set of arbitrary points in time. I believe a bash script, based on the above command, perhaps with an array of pre-selected cuts, could do the trick, but I lack the expertise.