> ffmpeg -loop 1 -r 1 -i image.jpg -i audio.wav -shortest -strict -2 test.mp4

Worker has received command
Received command: -loop 1 -r 1 -i image.jpg -i audio.wav -shortest -strict -2 test.mp4.  Processing with 268435456 bits.
ffmpeg version git-2013-11-21-d1760dd Copyright (c) 2000-2013 the FFmpeg developers
  built on Nov 21 2013 20:03:34 with emcc (Emscripten GCC-like replacement) 1.7.5 (commit 42fdcd5e0f7410d34d57fbf883c4e8039ec4d824)
  configuration: --cc=emcc --enable-cross-compile --target-os=none --arch=x86_32 --cpu=generic --disable-ffplay --disable-ffprobe --disable-ffserver --disable-asm --disable-doc --disable-devices --disable-pthreads --disable-w32threads --disable-network --disable-hwaccels --disable-parsers --disable-bsfs --disable-debug --disable-zlib --disable-protocols --disable-indevs --disable-outdevs --enable-protocol=file --enable-pic --enable-small
  libavutil      52. 52.100 / 52. 52.100
  libavcodec     55. 41.100 / 55. 41.100
  libavformat    55. 21.100 / 55. 21.100
  libavdevice    55.  5.100 / 55.  5.100
  libavfilter     3. 90.102 /  3. 90.102
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
[mjpeg @ 0xcbaa20] Warning: not compiled with thread support, using thread emulation
Input #0, image2, from 'image.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: mjpeg, yuvj420p(pc), 1024x640 [SAR 72:72 DAR 8:5], 25 fps, 25 tbr, 25 tbn, 25 tbc
[pcm_s16le @ 0xcbdc20] Warning: not compiled with thread support, using thread emulation
Guessed Channel Layout for  Input Stream #1.0 : mono
Input #1, wav, from 'audio.wav':
  Duration: 00:01:00.91, bitrate: 706 kb/s
    Stream #1:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, mono, s16, 705 kb/s
[swscaler @ 0xca2140] deprecated pixel format used, make sure you did set range correctly
[mpeg4 @ 0xcbc150] Warning: not compiled with thread support, using thread emulation
[aac @ 0xd3e940] Warning: not compiled with thread support, using thread emulation
[mjpeg @ 0xcbaa20] Warning: not compiled with thread support, using thread emulation
[pcm_s16le @ 0xcbdc20] Warning: not compiled with thread support, using thread emulation
Output #0, mp4, to 'output/test.mp4':
  Metadata:
    encoder         : Lavf55.21.100
    Stream #0:0: Video: mpeg4 ( [0][0][0] / 0x0020), yuv420p, 1024x640 [SAR 1:1 DAR 8:5], q=2-31, 200 kb/s, 16384 tbn, 1 tbc
    Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, mono, fltp, 128 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg -> mpeg4)
  Stream #1:0 -> #0:1 (pcm_s16le -> aac)
Press [q] to stop, [?] for help
frame=    1 fps=0.0 q=5.5 size=       0kB time=00:00:01.00 bitrate=   0.4kbits/s
frame=    4 fps=0.0 q=2.0 size=      97kB time=00:00:04.00 bitrate= 198.0kbits/s
frame=   11 fps= 10 q=2.0 size=     221kB time=00:00:11.00 bitrate= 164.8kbits/s
frame=   21 fps= 13 q=2.0 size=     438kB time=00:00:21.00 bitrate= 171.0kbits/s
frame=   31 fps= 15 q=2.0 size=     668kB time=00:00:31.00 bitrate= 176.4kbits/s
frame=   40 fps= 15 q=2.0 size=     896kB time=00:00:40.00 bitrate= 183.5kbits/s
frame=   50 fps= 16 q=2.0 size=    1123kB time=00:00:50.00 bitrate= 184.0kbits/s
frame=   61 fps= 17 q=1.6 size=    1287kB time=00:01:01.00 bitrate= 172.8kbits/s
frame=   62 fps= 17 q=2.0 Lsize=    1398kB time=00:01:02.00 bitrate= 184.7kbits/s
video:431kB audio:955kB subtitle:0 global headers:0kB muxing overhead 0.891828%
Finished processing (took 6837ms)