>ffmpeg -loop 1 -i art.jpg -i music.mp3 -filter_complex "[0:v]scale=1920:ih,setd
ar=16/9,boxblur=10[bg];[bg][0:v]overlay=(W-w)/2:(H-h)/2[v]" -map "[v]" -map 0:a
-c:a copy -shortest output.mp4
ffmpeg version N-72566-gd8bbb99 Copyright (c) 2000-2015 the FFmpeg developers
  built with gcc 4.9.2 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-l
ibilbc --enable-libmodplug --enable-libmfx --enable-libmp3lame --enable-libopenc
ore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --ena
ble-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable
-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enabl
e-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable
-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --e
nable-lzma --enable-decklink --enable-zlib
  libavutil      54. 26.101 / 54. 26.101
  libavcodec     56. 41.101 / 56. 41.101
  libavformat    56. 34.100 / 56. 34.100
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 16.101 /  5. 16.101
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  3.100 / 53.  3.100
Input #0, image2, from 'art.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 15620 kb/s
    Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 500x500 [S
AR 72:72 DAR 1:1], 25 fps, 25 tbr, 25 tbn, 25 tbc
[mp3 @ 02e66060] Skipping 0 bytes of junk at 140.
[mp3 @ 02e66060] Estimating duration from bitrate, this may be inaccurate
Input #1, mp3, from 'music.mp3':
  Metadata:
    title           : Melaza
    artist          : Hasse de Moor, Happy Colors
    TBPM            : 150
    genre           : Swag
    encoded_by      : LAME in FL Studio 11
    date            : 2015
  Duration: 00:03:24.88, start: 0.000000, bitrate: 320 kb/s
    Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 320 kb/s
Stream map '0:a' matches no streams.

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