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• avfilter/vf_framerate : change blend factor precision

  15 janvier 2018, par Marton Balint

  avfilter/vf_framerate : change blend factor precision
  This is done mainly in preparation for the SIMD patches.
   for the 8-bit input, decrease the blend factor precision to 7-bit.
  
   for the 16-bit input, increase the blend factor precision to 15-bit.
  
   make sure the blend functions are not called with 0 or maximum blending
  
    factors, because we don't want the signed factor integers to overflow.
  Fate test changes are due to different rounding.
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] libavfilter/vf_framerate.c
  • [DH] tests/ref/fate/filter-framerate-12bit-down
  • [DH] tests/ref/fate/filter-framerate-12bit-up
  • [DH] tests/ref/fate/filter-framerate-up

• Use FFMPEG to blend streaming overlay onto second stream

  31 août 2017, par Louwrens Benade

  I’m trying to build a form of monitoring that can be superimposed onto a live stream.

  Monitor Overlay

  ffmpeg -i rtmp://localhost/pool/livestream -filter_complex \
  
    "nullsrc=1024x576[1:v]; \
  
    [0:a]showvolume=v=0:o=1:t=0:f=0.1,drawbox=x=ih-40:y=0:w=40:h=ih[volume]; \
  
    [1:v]drawtext=x=(main_w/2)-(text_w/2):y=text_h:fontsize=30:fontcolor=white:borderw=1:text='Stream Label',scale=-1:-1[label]; \
  
    [label][volume]overlay=x=main_w-40:y=0[output]" \
  
    -map "[output]" -f flv rtmp://localhost/pool/livestream_overlay

  What I would like to accomplish is that this stream be superimposed onto the original stream and pushed to a third RTMP endpoint, like this :

  ffmpeg -i rtmp://localhost/pool/livestream -i rtmp://localhost/pool/livestream_overlay \
  
    -filter_complex "[0:v][1:v]overlay=shortest=1[output]" \
  
    -f flv rtmp://localhost/pool/livestream_monitor

  While the workflow seems to be working, the overlay is not blending (subtracted ?) onto the original video :

  Actual output

  

  Expected output

  

  Note : codec options have been removed for brevity’s sake.

• How to blend/merge two videos in android programmatically

  7 août 2017, par endryha

  As description says I am trying to create a video which consists of background video and semi-transparent video overlay on top of it.

  My initial attempt was to use ffmpeg for android https://github.com/WritingMinds/ffmpeg-android-java and use blend filter in overlay mode.

  But it turned out that ffmpeg android library is built on top of ffmpeg 2.4 but blend filter is available since ffmpeg 2.6. So far ffmpeg failed for me and I am looking for alternative solution.

  Any advices are warmly appreciated.

  UPDATE#1

  I finally managed to build ffmpeg 2.6.4 for android which contains blend filter but another issue appeared. When it start video processing it just stops in the beginning and never ends, there is not output from ffmpeg tool, no errors, no warnings, there is nothing that can help me to trace down the problem.

  On android device it runs following command :

  /data/user/0/com.test.app/files/ffmpeg 
  
  -i /storage/emulated/0/Android/data/com.test.app/files/video/vid1.mp4 
  
  -i /storage/emulated/0/Android/data/com.test.app/files/video/overlay.mp4 
  
  -filter_complex blend=all_mode='overlay':all_opacity=0.8" 
  
  -strict -2 /storage/emulated/0/Android/data/com.test.app/files/video/blended.mp4

  And there is following output :

  ffmpeg version n2.6.4 Copyright (c) 2000-2015 the FFmpeg developers
  
     built with gcc 4.8 (GCC)
  
     configuration: --target-os=linux --cross-prefix=/media/ubuntu/data/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/media/ubuntu/data/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-fontconfig --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=/media/ubuntu/data/ffmpeg-android/ffmpeg-pkg-config --prefix=/media/ubuntu/data/ffmpeg-android/build/armeabi-v7a-neon --extra-cflags='-I/media/ubuntu/data/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all -mfpu=neon' --extra-ldflags='-L/media/ubuntu/data/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
  
     libavutil      54. 20.100 / 54. 20.100
  
     libavcodec     56. 26.100 / 56. 26.100
  
     libavformat    56. 25.101 / 56. 25.101
  
     libavdevice    56.  4.100 / 56.  4.100
  
     libavfilter     5. 11.102 /  5. 11.102
  
     libswscale      3.  1.101 /  3.  1.101
  
     libswresample   1.  1.100 /  1.  1.100
  
     libpostproc    53.  3.100 / 53.  3.100
  
   [h264 @ 0xb5e03000] no frame!
  
   [aac @ 0xb5e03400] Input buffer exhausted before END element found
  
   Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Android/data/com.test.app/files/video/vid1.mp4':
  
     Metadata:
  
       major_brand     : mp42
  
       minor_version   : 0
  
       compatible_brands: isommp42
  
       creation_time   : 2015-08-30 17:19:07
  
     Duration: 00:00:05.03, start: 0.000000, bitrate: 3449 kb/s
  
       Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 640x640, 3381 kb/s, SAR 1:1 DAR 1:1, 30 fps, 30 tbr, 90k tbn, 180k tbc (default)
  
       Metadata:
  
         creation_time   : 2015-08-30 17:19:07
  
         handler_name    : VideoHandle
  
       Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 63 kb/s (default)
  
       Metadata:
  
         creation_time   : 2015-08-30 17:19:07
  
         handler_name    : SoundHandle
  
   [h264 @ 0xb5e03800] no frame!
  
   [aac @ 0xb5e04400] Input buffer exhausted before END element found
  
   Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Android/data/com.test.app/files/video/overlay.mp4':
  
     Metadata:
  
       major_brand     : mp42
  
       minor_version   : 0
  
       compatible_brands: isommp42
  
       creation_time   : 2015-08-30 17:19:07
  
     Duration: 00:00:05.03, start: 0.000000, bitrate: 3449 kb/s
  
       Stream #1:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 640x640, 3381 kb/s, SAR 1:1 DAR 1:1, 30 fps, 30 tbr, 90k tbn, 180k tbc (default)
  
       Metadata:
  
         creation_time   : 2015-08-30 17:19:07
  
         handler_name    : VideoHandle
  
       Stream #1:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 63 kb/s (default)
  
       Metadata:
  
         creation_time   : 2015-08-30 17:19:07
  
         handler_name    : SoundHandle

  After this output ffmpeg process is still running but it doesn’t provide any response... I am not sure how to deal with such issue, maybe I can try to use different codecs which works better on android or enable some debugging logging in ffmpeg.
  Any advices would help.

  UPDATE#2

  Thank you