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• ffmpeg how to add a transparent watermark (png image) with opacity 50% in the video

  30 mai 2015, par user3361920

  I am adding a watermark in the video and am using the code below :-

  exec($ffmpegPath . " -i " . $tmpflvlinkFile .  " -i " . $water . " -    filter_complex \ 'overlay=180:150' -codec:a copy " . $flvlinkFile);

  where variables $ffmpegPath is the path of ffmpeg, $tmpflvlinkFile is the source path video file , $water is the source path of watermark image and $flvlinkFile is the path of target/resultant video file.
  I have even tried using transparent image for the watermark but still it did not help. All I want is the resultant video’s watermark to be transparent (50% opaque) so that the view/seen behind the watermark is visible in the video.

  Please help. Thanks

• FFMPEG with SoX : configure : error : cannot find ffmpeg

  17 janvier 2014, par Alberto Megía

  So I am trying to install in my Ubuntu Desktop 12.04 SoX with FFMPEG support for m4a files.

  I have followed this instructions to install FFMPEG, installing only certain encoders. Finally, this is my set up :

  ffmpeg version git-2014-01-17-3ca7085 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Jan 17 2014 12:36:01 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  
    configuration: --prefix=~/ffmpeg_build --extra-cflags=-I~/ffmpeg_build/include --extra-ldflags=-L~/ffmpeg_build/lib --bindir=~/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-nonfree
  
    libavutil      52. 62.100 / 52. 62.100
  
    libavcodec     55. 48.101 / 55. 48.101
  
    libavformat    55. 23.103 / 55. 23.103
  
    libavdevice    55.  5.102 / 55.  5.102
  
    libavfilter     4.  1.100 /  4.  1.100
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Hyper fast Audio and Video encoder

  Then, I wget SoX 14.4.1 version and try to configure with FFMPEG support like this :

  ./configure --with-ffmpeg

  But I get this error :

  checking for FFMPEG... no
  
  checking libavformat/avformat.h usability... no
  
  checking libavformat/avformat.h presence... no
  
  checking for libavformat/avformat.h... no
  
  checking ffmpeg/avformat.h usability... no
  
  checking ffmpeg/avformat.h presence... no
  
  checking for ffmpeg/avformat.h... no
  
  configure: error: in `~/sox-14.4.1':
  
  configure: error: cannot find ffmpeg
  
  See `config.log' for more details

  So I try to set PKG_CONFIG_PATH environment variable :

  PKG_CONFIG_PATH=~/ffmpeg_build/lib/pkgconfig
  
  ./configure --with-ffmpeg

  Getting :

  checking for FFMPEG... yes
  
  checking libavformat/avformat.h usability... yes
  
  checking libavformat/avformat.h presence... yes
  
  checking for libavformat/avformat.h... yes
  
  checking for av_open_input_file in -lavformat... no
  
  configure: error: in `~/sox-14.4.1':
  
  configure: error: cannot find ffmpeg
  
  See `config.log' for more details

  Checking 'config.log' I see the following error :

  | #define HAVE_LIBAVFORMAT_AVFORMAT_H 1
  
  | /* end confdefs.h.  */
  
  |
  
  | /* Override any GCC internal prototype to avoid an error.
  
  |    Use char because int might match the return type of a GCC
  
  |    builtin and then its argument prototype would still apply.  */
  
  | #ifdef __cplusplus
  
  | extern "C"
  
  | #endif
  
  | char av_open_input_file ();
  
  | int
  
  | main ()
  
  | {
  
  | return av_open_input_file ();
  
  |   ;
  
  |   return 0;
  
  | }
  
  configure:15862: result: no
  
  configure:15935: error: in `~/sox-14.4.1':
  
  configure:15937: error: cannot find ffmpeg

  What am I missing here ?
  Thx !

• how do i modify this ffmpeg build script for minimal binary size output

  13 janvier 2015, par Brian

  I’m trying to build the ffmpeg binaries for android on 3 chipsets. The output file size is too large to include in the project around 15mb.

  https://github.com/falnatsheh/ffmpeg-android is the github project repo

  the .sh build script for ffmpeg is like this

  #!/bin/bash
  
  
  
  . abi_settings.sh $1 $2 $3
  
  
  
  pushd ffmpeg
  
  
  
  case $1 in
  
    armeabi-v7a | armeabi-v7a-neon)
  
      CPU='cortex-a8'
  
    ;;
  
    x86)
  
      CPU='i686'
  
    ;;
  
  esac
  
  
  
  make clean
  
  
  
  ./configure \
  
  --target-os="$TARGET_OS" \
  
  --cross-prefix="$CROSS_PREFIX" \
  
  --arch="$NDK_ABI" \
  
  --cpu="$CPU" \
  
  --enable-runtime-cpudetect \
  
  --sysroot="$NDK_SYSROOT" \
  
  --enable-pic \
  
  --enable-libx264 \
  
  --enable-pthreads \
  
  --disable-debug \
  
  --disable-ffserver \
  
  --enable-version3 \
  
  --enable-hardcoded-tables \
  
  --disable-ffplay \
  
  --disable-ffprobe \
  
  --enable-gpl \
  
  --enable-yasm \
  
  --disable-doc \
  
  --disable-shared \
  
  --enable-static \
  
  --pkg-config="${2}/ffmpeg-pkg-config" \
  
  --prefix="${2}/build/${1}" \
  
  --extra-cflags="-I${TOOLCHAIN_PREFIX}/include $CFLAGS" \
  
  --extra-ldflags="-L${TOOLCHAIN_PREFIX}/lib $LDFLAGS" \
  
  --extra-libs="-lm" \
  
  --extra-cxxflags="$CXX_FLAGS" || exit 1
  
  
  
  make -j${NUMBER_OF_CORES} && make install || exit 1
  
  
  
  popd

  I tried adding —disable-everything as the first line in configure but then the compiler complains that I didnt set a target-os even though its the next line

  In the app I only use ffmpeg to take input mp4 videos and transpose and rotate them
  here are the two commands

  -y -i %s -vf transpose=%d -tune film -metadata:s:v rotate=0 -c:v libx264 -preset ultrafast -crf 27 -c:a copy -bsf:a aac_adtstoasc %s

  where %s is a file path

  and then concat files

  -y -i concat:%s -preset ultrafast -crf 27 -c:v copy -c:a copy -bsf:a aac_adtstoasc %s

  If someone can help me with the build script that would be awesome