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• Using ffmpeg to overlay black line or add border to two side by side videos

  14 février 2020, par user3135427

  I am using the following to generate a video that is side by side.

  ffmpeg -i left.mp4 -i right.mp4 -filter_complex "[0:v]setpts=PTS-STARTPTS, pad=iw*2:ih[bg]; [1:v]setpts=PTS-STARTPTS[fg]; [bg][fg]overlay=w" -y final.mp4

  It looks like this.

  http://www.mo-de.net/d/partnerAcrobatics.mp4

  I would like to place a vertical black line on top right in the middle or add a black border to the video on the left. If I add a border to the left video I would like to maintain the original sum dimension of the original videos. This solution would require subtracting the border width from the left videos width. I will take either solution.

  Thanks

• Revision 9261e1aa6e : Changed validation of reference frame size A previous change, https://gerrit.ch

  24 juillet 2014, par Yaowu Xu

  Changed Paths :
   Modify /vp9/decoder/vp9_decodeframe.c

  
   Modify /vp9/decoder/vp9_decodemv.c

  
  
  Changed validation of reference frame size

  A previous change, https://gerrit.chromium.org/gerrit/#/c/70632,
  introduced a size validation for reference frames to insuare the
  input stream is a valid VP9 stream. However, the logic requiring
  all reference frames have valid size turned out to be too strict.

  In this commit, we modify the validation to require one of the
  reference frame has valid dimension. In addition, the decoder
  reports error whenever it detects the use of reference frame
  with invalid scalig ratio.

  Change-Id : If8efc312244087556cfe00f1fcbdff811268ebad

• How to compile ffmpeg on Windows 10 ?

  13 février 2018, par Mr.Han

  My development environment is Windows 10 - 64bit. It is set to Android development environment. I am trying to compile ffmpeg.

  I installed cygwin and installed cygwin. gcc related all, dos2unix, make, automake. ffmpeg version is 3-2.10.

  Configure file

  Before

  SLIBNAME_WITH_MAJOR='$(SLIBNAME).$(LIBMAJOR)'
  
  LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
  
  SLIB_INSTALL_NAME='$(SLIBNAME_WITH_VERSION)'
  
  SLIB_INSTALL_LINKS='$(SLIBNAME_WITH_MAJOR) $(SLIBNAME)'

  After

  SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
  
  LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
  
  SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)'
  
  SLIB_INSTALL_LINKS='$(SLIBNAME)'

  build_android.sh

  #!/bin/bash
  
  NDK=c:/Users/storm/AppData/Local/Android/Sdk/ndk-bundle
  
  SYSROOT=$NDK/platforms/android-16/arch-arm/
  
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64
  
  CUR=`cygpath -m $(pwd)`
  
  TEMPDIR=`cygpath -m /tmp`
  
  TMP=`cygpath -m /tmp`
  
  function build_one
  
  {
  
  sed -i 's/ln_s="ln -s -f"/ln_s="cp -f"/g' ./configure
  
  ./configure \
  
  --prefix=$PREFIX \
  
  --enable-shared \
  
  --disable-static \
  
  --disable-doc \
  
  --disable-ffmpeg \
  
  --disable-ffplay \
  
  --disable-ffprobe \
  
  --disable-ffserver \
  
  --disable-avdevice \
  
  --disable-doc\
  
  --disable-symver \
  
  --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
  
  --target-os=linux \
  
  --arch=arm \
  
  --enable-cross-compile \
  
  --sysroot=$SYSROOT \
  
  --extra-cflags="-Os -fpic $ADDI_CFLAGS" \
  
  --extra-ldflags="$ADDI_LDFLAGS"\
  
  $ADDITIONAL_CONFIGURE_FLAG
  
  sed -i':a;N;$!ba;s/gcc 4.9\r/gcc 4.9/g' ./config.h
  
  sed -i':a;N;$!ba;s/gcc 4.9\r/gcc 4.9/g' ./config.mak
  
  #make clean
  
  #make
  
  #make install
  
  }
  
  CPU=arm
  
  PREFIX=$CUR/android/$CPU
  
  ADDI_CFLAGS="-marm"
  
  build_one

  Where is the problem ?