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• Creating automated ffmpeg converter

  27 janvier 2019, par Jeffrey Moser

  I am trying to create an automated process using ffmpeg and am having issues understanding how to adapt the code to automator.

  The code works beautifully in the terminal, but requires each filename to me entered manually. I am trying to automate the process.

  for f in "$@"
  
  do
  
  
  
  FILE= "$f"
  
  OUT=${FILE/mp4/png}
  
  OUT_WIDTH=10800
  
  OUT_HEIGHT=3600
  
  
  
  eval $(ffprobe -v error -of flat=s=_ -select_streams v:0 -show_entries stream=height,width "${FILE}")
  
  IN_WIDTH=${streams_stream_0_width}
  
  IN_HEIGHT=${streams_stream_0_height}
  
  
  
   eval $(ffprobe -v error -of flat=s=_ -count_frames -select_streams v:0 -show_entries stream=nb_read_frames "${FILE}")
  
  IN_FRAMES=${streams_stream_0_nb_read_frames}
  
  
  
  W_TILES=$(bc <<< "(sqrt($OUT_WIDTH*$IN_FRAMES*$IN_HEIGHT/($IN_WIDTH*$OUT_HEIGHT))+3)")
  
  H_TILES=$(bc <<< "(sqrt($OUT_HEIGHT*$IN_FRAMES*$IN_WIDTH/($OUT_WIDTH*$IN_HEIGHT)))")
  
  
  
  W_SHRUNK=$(bc <<< "$OUT_WIDTH/$W_TILES")
  
  H_SHRUNK=$(bc <<< "$OUT_HEIGHT/$H_TILES")
  
  
  
  ffmpeg -i "${FILE}" -vf "hflip,transpose=cclock,scale=${H_SHRUNK}:${W_SHRUNK},tile=${H_TILES}x${W_TILES},transpose=clock,hflip,scale=${OUT_WIDTH}x${OUT_HEIGHT}" -an -sn -vsync 0 "${OUT}"
  
  
  
  
  
  done

  I expected the code to produce an image of every frame of the film. But instead I got a massive error message.

  The action “Run Shell Script” encountered an error: “-: line 5: /Users/jeffreymoser/21 A New Dawn.mp4: Permission denied
  
  -: line 14: ffprobe: command not found
  
  -: line 18: ffprobe: command not found
  
  (standard_in) 1: parse error
  
  (standard_in) 1: parse error
  
  (standard_in) 1: parse error
  
  (standard_in) 2: parse error
  
  (standard_in) 2: parse error
  
  -: line 29: ffmpeg: command not found
  
  -: line 5: /Users/jeffreymoser/22 Battle Hymn.mp4: Permission denied
  
  -: line 14: ffprobe: command not found
  
  -: line 18: ffprobe: command not found
  
  (standard_in) 1: parse error
  
  (standard_in) 1: parse error
  
  (standard_in) 1: parse error
  
  (standard_in) 2: parse error
  
  (standard_in) 2: parse error
  
  -: line 29: ffmpeg: command not found
  
  -: line 5: /Users/jeffreymoser/23 Reckless.mp4: Permission denied
  
  -: line 14: ffprobe: command not found
  
  -: line 18: ffprobe: command not found
  
  (standard_in) 1: parse error
  
  (standard_in) 1: parse error
  
  (standard_in) 1: parse error
  
  (standard_in) 2: parse error
  
  (standard_in) 2: parse error
  
  -: line 29: ffmpeg: command not found
  
  -: line 5: /Users/jeffreymoser/24 Showdown.mp4: Permission denied
  
  -: line 14: ffprobe: command not found
  
  -: line 18: ffprobe: command not found
  
  (standard_in) 1: parse error
  
  (standard_in) 1: parse error
  
  (standard_in) 1: parse error
  
  (standard_in) 2: parse error
  
  (standard_in) 2: parse error
  
  -: line 29: ffmpeg: command not found
  
  -: line 5: /Users/jeffreymoser/25 Wedding Bells.mp4: Permission denied
  
  -: line 14: ffprobe: command not found
  
  -: line 18: ffprobe: command not found
  
  (standard_in) 1: parse error
  
  (standard_in) 1: parse error
  
  (standard_in) 1: parse error
  
  (standard_in) 2: parse error
  
  (standard_in) 2: parse error
  
  -: line 29: ffmpeg: command not found

• Extracting aspect ratio from ffprobe

  29 décembre 2020, par Linx

  I'm using ffprobe to determine a video's properties and assign them as variables in a bash script for batch encoding with ffmpeg, like so :

  


  eval $(ffprobe -v quiet -show_format -of flat=s=_ -show_entries 
        stream=height,width,duration,display_aspect_ratio "$f");
        width=${streams_stream_0_width};
        height=${streams_stream_0_height};
        aspect=${streams_stream_0_display_aspect_ratio};
    
    echo -e "Height/Width = $height/$width, Aspect = $aspect\n";


  


  That returns "Height/Width = 480/720, Aspect = 4:3" exactly like it should. But I need to insert the variable into my encode command as 4/3 and not 4:3. I'm not very good with bash scripting and I've searched for a solution, but I'm not even sure what you call what I'm trying to do, so I'm sure I've done the wrong search terms. How can I convert this ratio into a fraction to insert into a ffmpeg command ?

  


• How to configure FFMPEG to generate position independent code on IOS

  8 juillet 2013, par madadi

  I am developing an app on iOS which makes use of FFMPEG for video decoding. I want to get 'position independent code' of FFMPEG working on my app. --enable-pic option in the FFMPEG configuration generates position independent code only if I set --disable-asm. I concluded this when I ran the otool on my app(otool -hv 'appname'). Below are the details :

  If I set --enable-pic alone, below is the output with otool :

  magic     cputype  cpusubtype  caps  filetype  ncmds  sizeofcmds  flags
  
  MH_MAGIC  ARM      V7          0x00  EXECUTE   29     3724        NOUNDEFS DYLDLINK TWOLEVEL WEAK_DEFINES BINDS_TO_WEAK

  If I set --enable-pic and --disable-asm below is the output with otool,

  magic     cputype  cpusubtype  caps  filetype  ncmds  sizeofcmds  flags
  
  MH_MAGIC  ARM      V7          0x00  EXECUTE   51     5520        NOUNDEFS DYLDLINK TWOLEVEL WEAK_DEFINES BINDS_TO_WEAK **PIE** 

  Below are my configuration settings for FFMPEG(build-ffmpeg-ios.sh) :

  if [  `uname` =  "Darwin" ]; then
  
    SEDCMD="sed -i '' "
  
  else
  
    SEDCMD="sed -i "
  
  fi
  
  
  
  
  
  make clean
  
  ./configure \
  
      --prefix=$PREFIX \
  
      --enable-version3 \
  
      --enable-static \
  
      --disable-shared \
  
      --disable-doc \
  
      --disable-ffmpeg \
  
      --disable-ffplay \
  
      --disable-ffprobe \
  
      --disable-ffserver \
  
      --disable-avdevice \
  
      --disable-avfilter \
  
      --disable-postproc \
  
      --enable-small \
  
      --cross-prefix="$DEVROOT/usr/bin/" \
  
      --enable-cross-compile \
  
      --target-os=darwin \
  
      --arch=$ARCH \
  
      --cpu=$CPU \
  
      --cc="$CC" \
  
      --as="$AS" \
  
      --extra-cflags="$CFLAGS" \
  
      --extra-ldflags="$CFLAGS" \
  
      --disable-symver \
  
      --disable-debug \
  
      --disable-indevs \
  
      --disable-encoders \
  
      --disable-bsfs \
  
      --enable-pic \
  
      --disable-filters \
  
      $CONFIGURE_FLAGS || exit 1;
  
  $SEDCMD 's/HAVE_INLINE_ASM 1/HAVE_INLINE_ASM 0/g' config.h
  
  make install || exit 1;

  And below is the make file I use(iOS.mk) :

  FFMPEG_LIBS := libavcodec.a libavformat.a libavutil.a libswscale.a
  
  
  
  IOS_ARMV7_FFMPEG_LIB := $(addprefix build/ios/armv7/lib/, $(FFMPEG_LIBS))
  
  
  
  IOS_UNI_FFMPEG_LIB := $(addprefix build/ios/universal/lib/, $(FFMPEG_LIBS))
  
  
  
  
  
  
  
  IPHONE_SDK_VERSION := "5.0"
  
  IPHONE_DEPLOY_SDK := "3.2"
  
  
  
  ALL_IOS_LIBS := $(IOS_UNI_FFMPEG_LIB) 
  
  
  
  build/ios/universal/lib/%.a : build/ios/armv7/lib/%.a
  
      mkdir -p build/ios/universal/lib
  
      lipo -create -output $@ $^
  
  
  
  
  
  
  
  $(IOS_ARMV7_FFMPEG_LIB): 
  
      export PREFIX="`$(ABSPATH) build/ios/armv7`" && \
  
      export ARCH="arm" && \
  
      export CPU="cortex-a8" && \
  
      export IOS_BASE_SDK="$(IPHONE_SDK_VERSION)" && \
  
      export IOS_DEPLOY_TGT="$(IPHONE_DEPLOY_SDK)" && \
  
      export CONFIGURE_FLAGS="--enable-neon" && \
  
      export PATH="`$(ABSPATH) venders`:$$PATH" && \
  
      cd venders/ffmpeg && bash ../iphone-compile.sh arm7 ../build-ffmpeg-ios.sh

  Can someone please help me with getting the FFMPEG up and running with both 'pic' and assembly optimization enabled. Without assembly optimizastion, FFMPEG would not be helpful to me as the video decoding is extremely slow.