ffmpeg -r 20 -i %*.jpg -r 20 -s hd720 -vcodec libx264   /home/user/timelaps.mp4

ffmpeg version N-78590-g5590ab4 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.1)
  configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libfreetype --enable-gnutls --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvidstab
  libavutil      55. 18.100 / 55. 18.100
  libavcodec     57. 24.103 / 57. 24.103
  libavformat    57. 25.100 / 57. 25.100
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 32.100 /  6. 32.100
  libavresample   3.  0.  0 /  3.  0.  0
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
[image2 @ 0x2621b80] Pattern type 'glob_sequence' is deprecated: use pattern_type 'glob' instead
[mjpeg @ 0x2622e80] Changing bps to 8
Input #0, image2, from '%*.jpg':
  Duration: 00:04:05.80, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown), 1280x720, 25 fps, 25 tbr, 25 tbn, 25 tbc
File '/home/ggw/timelaps.mp4' already exists. Overwrite ? [y/N] y
No pixel format specified, yuvj422p for H.264 encoding chosen.
Use -pix_fmt yuv420p for compatibility with outdated media players.
[libx264 @ 0x26259c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0x26259c0] profile High 4:2:2, level 3.1, 4:2:2 8-bit
[libx264 @ 0x26259c0] 264 - core 148 r2643 5c65704 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - 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=6 lookahead_threads=1 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=20 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 '/home/user/timelaps.mp4':
  Metadata:
    encoder         : Lavf57.25.100
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuvj422p(pc), 1280x720, q=-1--1, 20 fps, 10240 tbn, 20 tbc
    Metadata:
      encoder         : Lavc57.24.103 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
Press [q] to stop, [?] for help
Input stream #0:0 frame changed from size:1280x720 fmt:yuvj422p to size:1280x720 fmt:yuvj420px
[swscaler @ 0x2b5b0a0] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 0x2b5b0a0] deprecated pixel format used, make sure you did set range correctlyop=329 speed=0.834x
[swscaler @ 0x2addc20] deprecated pixel format used, make sure you did set range correctlyop=999 speed= 0.8x
Input stream #0:0 frame changed from size:1280x720 fmt:yuvj420p to size:1280x720 fmt:yuvj422p

[mjpeg @ 0x26236c0] mjpeg: unsupported coding type (c8)7.55 bitrate=5410.8kbits/s dup=0 drop=1084 speed=0.796x
[mjpeg @ 0x26236c0] mjpeg: unsupported coding type (c6)
[mjpeg @ 0x26236c0] Can not process SOS before SOF, skipping
[mjpeg @ 0x26236c0] huffman table decode error
Error while decoding stream #0:0: Invalid data found when processing input
[mjpeg @ 0x26236c0] invalid id 71
Error while decoding stream #0:0: Invalid data found when processing input

frame= 3470 fps= 15 q=-1.0 Lsize=  142624kB time=00:02:53.40 bitrate=6738.0kbits/s dup=0 drop=2673 speed=0.731x
video:142581kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.029610%
[libx264 @ 0x26259c0] frame I:22    Avg QP:22.06  size: 85992
[libx264 @ 0x26259c0] frame P:1735  Avg QP:25.45  size: 54210
[libx264 @ 0x26259c0] frame B:1713  Avg QP:27.67  size: 29221
[libx264 @ 0x26259c0] consecutive B-frames:  6.9% 79.9%  5.7%  7.5%
[libx264 @ 0x26259c0] mb I  I16..4:  4.6% 94.4%  1.1%
[libx264 @ 0x26259c0] mb P  I16..4:  1.5% 34.8%  1.0%  P16..4: 21.7% 18.8% 15.3%  0.0%  0.0%    skip: 6.9%
[libx264 @ 0x26259c0] mb B  I16..4:  1.0% 14.8%  1.2%  B16..8: 24.4% 12.6%  5.2%  direct:15.2%  skip:25.5%  L0:52.5% L1:28.9% BI:18.6%
[libx264 @ 0x26259c0] 8x8 transform intra:91.4% inter:86.0%
[libx264 @ 0x26259c0] coded y,uvDC,uvAC intra: 76.2% 86.4% 28.3% inter: 42.7% 69.2% 15.5%
[libx264 @ 0x26259c0] i16 v,h,dc,p: 32% 36% 15% 17%
[libx264 @ 0x26259c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 23% 29%  3%  4%  4%  3%  4%  4%
[libx264 @ 0x26259c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 17% 14%  6%  9%  9%  7%  8%  7%
[libx264 @ 0x26259c0] i8c dc,h,v,p: 46% 22% 28%  4%
[libx264 @ 0x26259c0] Weighted P-Frames: Y:6.5% UV:5.2%
[libx264 @ 0x26259c0] ref P L0: 36.4% 11.0% 29.5% 22.2%  0.9%
[libx264 @ 0x26259c0] ref B L0: 53.9% 43.3%  2.7%
[libx264 @ 0x26259c0] ref B L1: 95.2%  4.8%
[libx264 @ 0x26259c0] kb/s:6732.11