ffmpeg blending log

gistfile1.py

> ffmpeg \
> -i background.mp4 \
> -loop 1 -f image2 -i transparent-overlay.png \
> -shortest -y \
> -filter_complex "[1:0][0:0]blend=all_mode=average" \
> overlay.mp4

ffmpeg version 2.4.3-   http://johnvansickle.com/ffmpeg/    Copyright (c) 2000-2014 the FFmpeg developers
  built on Nov  4 2014 13:14:24 with gcc 4.8 (Debian 4.8.3-13)
  configuration: --enable-gpl --enable-version3 --disable-shared --disable-debug --enable-runtime-cpudetect --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libwebp --enable-libspeex --enable-libvorbis --enable-libvpx --enable-libfreetype --enable-fontconfig --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg --enable-libopus --disable-ffserver --enable-libass --enable-gnutls --cc=gcc-4.8
  libavutil      54.  7.100 / 54.  7.100
  libavcodec     56.  1.100 / 56.  1.100
  libavformat    56.  4.101 / 56.  4.101
  libavdevice    56.  0.100 / 56.  0.100
  libavfilter     5.  1.100 /  5.  1.100
  libswscale      3.  0.100 /  3.  0.100
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  0.100 / 53.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'background.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf56.4.101
  Duration: 00:01:36.40, start: 0.033333, bitrate: 1132 kb/s
    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 999 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Input #1, image2, from 'transparent-overlay.png':
  Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
    Stream #1:0: Video: png, rgba, 640x360 [SAR 2835:2835 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc
[libx264 @ 0x3580cc0] using SAR=1/1
[libx264 @ 0x3580cc0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0x3580cc0] profile High, level 3.0
[libx264 @ 0x3580cc0] 264 - core 142 r50 dd79a61 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'overlay.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf56.4.101
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 640x360 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
    Metadata:
      encoder         : Lavc56.1.100 libx264
    Stream #0:1(eng): Audio: aac (libvo_aacenc) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, s16, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      encoder         : Lavc56.1.100 libvo_aacenc
Stream mapping:
  Stream #0:0 (h264) -> blend:bottom (graph 0)
  Stream #1:0 (png) -> blend:top (graph 0)
  blend (graph 0) -> Stream #0:0 (libx264)
  Stream #0:1 -> #0:1 (aac (native) -> aac (libvo_aacenc))
Press [q] to stop, [?] for help
frame=   81 fps=0.0 q=28.0 size=      78kB time=00:00:03.52 bitrate= 180.7kbits
... 
frame= 2468 fps=146 q=-1.0 Lsize=    7220kB time=00:01:38.64 bitrate= 599.6kbits/s    
video:5643kB audio:1507kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.981916%
[libx264 @ 0x3580cc0] frame I:11    Avg QP:19.23  size: 16922
[libx264 @ 0x3580cc0] frame P:1104  Avg QP:21.09  size:  4387
[libx264 @ 0x3580cc0] frame B:1353  Avg QP:24.45  size:   553
[libx264 @ 0x3580cc0] consecutive B-frames: 25.4%  0.4% 12.6% 61.6%
[libx264 @ 0x3580cc0] mb I  I16..4: 14.3% 65.2% 20.6%
[libx264 @ 0x3580cc0] mb P  I16..4:  0.1%  0.9%  0.1%  P16..4: 35.2% 17.4%  8.8%  0.0%  0.0%    skip:37.4%
[libx264 @ 0x3580cc0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8: 31.4%  1.0%  0.2%  direct: 0.6%  skip:66.7%  L0:31.0% L1:63.0% BI: 6.0%
[libx264 @ 0x3580cc0] 8x8 transform intra:72.5% inter:64.9%
[libx264 @ 0x3580cc0] coded y,uvDC,uvAC intra: 80.7% 54.2% 7.2% inter: 15.9% 6.9% 0.0%
[libx264 @ 0x3580cc0] i16 v,h,dc,p: 28% 43%  7% 22%
[libx264 @ 0x3580cc0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  9% 38% 14%  3%  6%  3% 15%  2% 10%
[libx264 @ 0x3580cc0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu:  9% 41% 11%  3%  7%  3% 15%  2% 10%
[libx264 @ 0x3580cc0] i8c dc,h,v,p: 51% 37%  9%  3%
[libx264 @ 0x3580cc0] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x3580cc0] ref P L0: 69.3% 20.7%  8.2%  1.7%
[libx264 @ 0x3580cc0] ref B L0: 96.7%  2.9%  0.4%
[libx264 @ 0x3580cc0] ref B L1: 96.0%  4.0%
[libx264 @ 0x3580cc0] kb/s:468.21