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• ffmpeg compile for Android

  21 mars 2016, par amar Kumar

  I’m trying to compile ffmmpeg for android using this but I’m getting " ERROR : freetype2 not found" as shown below in details.

  linux@user1:~/Downloads/android-ffmpeg$ ./configure_ffmpeg.sh
  
  ~/Downloads/android-ffmpeg ~/Downloads/android-ffmpeg
  
  No NDK_BASE set, using /opt/android-ndk
  
  patching file ffmpeg/libavfilter/Makefile
  
  Reversed (or previously applied) patch detected!  Skipping patch.
  
  2 out of 2 hunks ignored
  
  The next patch would create the file ffmpeg/libavfilter/af_aredact.c,
  
  which already exists!  Skipping patch.
  
  1 out of 1 hunk ignored
  
  patching file ffmpeg/libavfilter/allfilters.c
  
  Reversed (or previously applied) patch detected!  Skipping patch.
  
  2 out of 2 hunks ignored
  
  The next patch would create the file ffmpeg/libavfilter/vf_redact.c,
  
  which already exists!  Skipping patch.
  
  1 out of 1 hunk ignored
  
  patching file ffmpeg/libavutil/arm/intmath.h
  
  Reversed (or previously applied) patch detected!  Skipping patch.
  
  2 out of 2 hunks ignored
  
  patching file libavcodec/arm/ac3dsp_armv6.S
  
  Reversed (or previously applied) patch detected!  Skipping patch.
  
  1 out of 1 hunk ignored
  
  patching file libavcodec/arm/fft_fixed_neon.S
  
  Reversed (or previously applied) patch detected!  Skipping patch.
  
  1 out of 1 hunk ignored
  
  patching file libavcodec/arm/fft_neon.S
  
  Reversed (or previously applied) patch detected!  Skipping patch.
  
  2 out of 2 hunks ignored
  
  patching file libavcodec/arm/sbrdsp_neon.S
  
  Reversed (or previously applied) patch detected!  Skipping patch.
  
  2 out of 2 hunks ignored
  
  patching file libavcodec/arm/vp3dsp_neon.S
  
  Reversed (or previously applied) patch detected!  Skipping patch.
  
  1 out of 1 hunk ignored
  
  patching file libavcodec/arm/vp8_armv6.S
  
  Reversed (or previously applied) patch detected!  Skipping patch.
  
  2 out of 2 hunks ignored
  
  patching file libavcodec/arm/asm.S
  
  Reversed (or previously applied) patch detected!  Skipping patch.
  
  3 out of 3 hunks ignored
  
  patching file libavutil/arm/intmath.h
  
  Reversed (or previously applied) patch detected!  Skipping patch.
  
  3 out of 3 hunks ignored
  
  patching file configure
  
  Reversed (or previously applied) patch detected!  Skipping patch.
  
  1 out of 1 hunk ignored
  
  ~/Downloads/android-ffmpeg/ffmpeg ~/Downloads/android-ffmpeg ~/Downloads/android-ffmpeg
  
  *****************The error is here*****************
  
  
  
  ERROR: freetype2 not found
  
  
  
  If you think configure made a mistake, make sure you are using the latest
  
  version from Git.  If the latest version fails, report the problem to the
  
  ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
  
  Include the log file "config.log" produced by configure as this will help
  
  solving the problem.

  I have freetype installed and I also linked it as shown below in the /usr/include/

  rwxr-xr-x  3 root root   4096 Mar 20 22:13 freetype2
  
  lrwxrwxrwx  1 root root     23 Mar 20 22:14 freetype -> /usr/include/freetype2/

  I’m not sure what to do next, can you please help ?

• FFmpeg : Add alpha channel to a video using a PNG mask

  7 avril 2016, par Rodrigo Polo

  I saw that FFmpeg can merge/blend two videos with alpha channel and can encode video with alpha channel using the qtrle codec, but, It is possible to apply a PNG file mask, either a black and white or a PNG with an alpha channel to a video in order to have a video with the alpha channel of the PNG applied ?

  Here is the concept in images

  Original video :
  

  PNG file with alpha channel, the "mask" :
  

  And the result :
  

  Or even a black and white image as a mask for alpha channel :
  

  Any help would be appreciated, thank you !

• How to swap SBS LR 3D videos ?

  21 avril 2016, par Vitalis Hommel

  I have this command

  ffmpeg -i "D:\Neuer Ordner\Test.mkv" -c copy -ss 00:00:00 -t 00:08:00 -sn "D:\Neuer Ordner\Test1.mkv" -c copy -ss 00:08:00 -t 00:08:00 -sn "D:\Neuer Ordner\Test2.mkv" -c copy -ss 00:16:00 -t 00:08:00 -sn "D:\Neuer Ordner\Test3.mkv" -c copy -ss 00:24:00 -sn "D:\Neuer Ordner\Test4.mkv"

  My goal is to upload them to youtube. Yet I need to swap each pair before converting it, so left becomes right and right becomes left.

  I found the complex filter and tried

  ffmpeg -i "D:\Neuer Ordner\Test.mkv" -filter:v "crop=1280:720:0:0" -i "D:\Neuer Ordner\Test.mkv" -filter:v "crop=1280:720:1280:0" -filter_complex "pad=in_w*2:in_h, overlay=main_w/2:0, scale=in_w/2:in_h, scale=-1:720" -c:a copy "D:\Neuer Ordner\output.mkv" 

  Which led to

  Option filter:v (set stream filtergraph) cannot be applied to input file D:\Neuer Ordner\Test.mkv -- you are trying to apply an input option to an output file or vice versa. Move this option before the file it belongs to. 
  
  Error parsing options for input file D:\Neuer Ordner\Test.mkv. 
  
  Error opening input files: Invalid argument

  Which command solves this ?