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• Add 2 seconds of blank/black video with ffmpeg

  22 avril 2016, par user3076099

  Let’s say I have two videos I want play simultaneously. movieA.mp4 is 38.6 seconds duration, and movieB.mp4 is 31.14 seconds duration. Using ffmpeg is there an easy way to fill the end of movieB.mp4 with black silence so that it is exactly 38.6 seconds (matching movieA.mp4). There’s a very niche technical reason I want to do this, so don’t ask haha !!

  Also if possible, but less important, a way to remove this afterwards.

  Been searching for 2 days for any sort of easy way around this without luck !!!

  Thanks so much in advance !

• How can I get FFmpeg to locate installed libraries when —sysroot is pointing to another directory ?

  3 février 2013, par Xaero Degreaz

  I've been going at this, literally for days. I'm trying to build FFmpeg with libmp3lame for use in an Android application. The build script sets a --sysroot flag that points to the Android NDK directory necessary to build these libraries in a way that Android can use them.

  The problem comes when I add the flag to --enable-libmp3lame ; I get ERROR: libmp3lame >= 3.98.3 not found during the build start up. I know that LAME, and it's libraries are installed, because I can just run ./configure --enable-libmp3lame manually and the configuration launches without a hitch, and shows that libmp3lame is enabled for this build. However, building like this will simply not work for what I need it for, since I need the Android NDK to do some work.

  I've tracked the problem down to the fact that this build script is declaring the sysroot, and through some research, I've tried adding -Luser/include, -L/user/includeto the extra cflags, and ldflags (which I've read is the default search location for gcc). I've tried several other things as well, but I'm confident that someone out here can help with this specific problem. This entire build script is as follows :

  Extra info :

  • Build OS : Ubuntu 11.10
  • FFmpeg Ver : Latest from git
  • LAME Ver : 3.9.x
  • Android NDK : r7

  build.sh

  #!/bin/bash
  
  
  
  if [ "$NDK" = "" ]; then
  
      echo NDK variable not set, assuming ${HOME}/android-ndk
  
      export NDK=${HOME}/android-ndk
  
  fi
  
  
  
  SYSROOT=$NDK/platforms/android-3/arch-arm
  
  # Expand the prebuilt/* path into the correct one
  
  TOOLCHAIN=`echo $NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/*-x86`
  
  export PATH=$TOOLCHAIN/bin:$PATH
  
  
  
  rm -rf build/ffmpeg
  
  mkdir -p build/ffmpeg
  
  cd ffmpeg
  
  
  
  # Don't build any neon version for now
  
  for version in armv5te armv7a; do
  
  
  
          DEST=../build/ffmpeg
  
          FLAGS="--target-os=linux --cross-prefix=arm-linux-androideabi- --arch=arm"
  
          FLAGS="$FLAGS --sysroot=$SYSROOT"
  
          FLAGS="$FLAGS --soname-prefix=/data/data/net.smartnotes/lib/"
  
          FLAGS="$FLAGS --enable-shared --disable-symver"
  
          FLAGS="$FLAGS --enable-small --optimization-flags=-O2"
  
          FLAGS="$FLAGS --disable-everything --enable-protocol=file"
  
          FLAGS="$FLAGS --enable-libmp3lame --enable-encoder=nellymoser"
  
  
  
          case "$version" in
  
                  neon)
  
                      EXTRA_CFLAGS="-march=armv7-a -mfloat-abi=softfp -mfpu=neon"
  
                      EXTRA_LDFLAGS="-Wl,--fix-cortex-a8"
  
                      # Runtime choosing neon vs non-neon requires
  
                      # renamed files
  
                      ABI="armeabi-v7a"
  
                      ;;
  
                  armv7a)
  
                      # I have tried many things here.
  
                      EXTRA_CFLAGS="-march=armv7-a -mfloat-abi=softfp"
  
                      EXTRA_LDFLAGS=""
  
                      ABI="armeabi-v7a"
  
                      ;;
  
                  *)
  
                      # I have tried many things here.
  
                      EXTRA_CFLAGS="-Luser/include"
  
                      EXTRA_LDFLAGS=""
  
                      ABI="armeabi"
  
                      ;;
  
          esac
  
          DEST="$DEST/$ABI"
  
          FLAGS="$FLAGS --prefix=$DEST"
  
  
  
          mkdir -p $DEST
  
          echo $FLAGS --extra-cflags="$EXTRA_CFLAGS" --extra-ldflags="$EXTRA_LDFLAGS" > $DEST/info.txt
  
          ./configure $FLAGS --extra-cflags="$EXTRA_CFLAGS" --extra-ldflags="$EXTRA_LDFLAGS" | tee $DEST/configuration.txt
  
          [ $PIPESTATUS == 0 ] || exit 1
  
          make clean
  
          make -j4 || exit 1
  
          make install || exit 1
  
  
  
  done

• Getting return value of command inspite of sudo inside of php system

  21 avril 2016, par nithintou

  I’ve been trying for a few days to get the return value of a script that performs an ffmpeg recording in the server using php system() :

  system("/usr/bin/sudo /usr/bin/php /root/startrecord.php $userid", $retval);

  Tried exec() as well, but still can’t get the correct exit(n) code from the recording script to perform the next steps. I am guessing the return value i keep getting is from sudo and not the actual php script.

  Can you guys suggest any workarounds or tips as to what I may be doing wrong ?