ffmpeg.exe -r 1 -i slide_%04d.png -c:v libx264 -r 11 -pix_fmt yuv420p out.mp4

ffmpeg version N-63013-g4cdea92 Copyright (c) 2000-2014 the FFmpeg developers
  built on May  6 2014 22:09:20 with gcc 4.8.2 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r
--enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc -
-enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enabl
e-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-
libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libx265 --enable-lib
xavs --enable-libxvid --enable-decklink --enable-zlib
  libavutil      52. 81.100 / 52. 81.100
  libavcodec     55. 60.103 / 55. 60.103
  libavformat    55. 37.102 / 55. 37.102
  libavdevice    55. 13.101 / 55. 13.101
  libavfilter     4.  5.100 /  4.  5.100
  libswscale      2.  6.100 /  2.  6.100
  libswresample   0. 18.100 /  0. 18.100
  libpostproc    52.  3.100 / 52.  3.100
Input #0, image2, from 'slide_%04d.png':
  Duration: 00:00:00.44, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: png, rgb24, 854x480, 25 fps, 25 tbr, 25 tbn, 25 tbc
[libx264 @ 000000000036d380] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 000000000036d380] profile High, level 2.2
[libx264 @ 000000000036d380] 264 - core 142 r2409 d6b4e63 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.htm
l - 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 trell
is=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 interl
aced=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 key
int_min=11 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 'out.mp4':
  Metadata:
    encoder         : Lavf55.37.102
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 854x480, q=-1--1, 11264 tbn, 11 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (png -> libx264)
Press [q] to stop, [?] for help
frame=  111 fps=0.0 q=-1.0 Lsize=      12kB time=00:00:09.90 bitrate=   9.7kbits/s dup=100 drop=0
video:10kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 21.875633%
[libx264 @ 000000000036d380] frame I:1     Avg QP: 7.65  size:  1472
[libx264 @ 000000000036d380] frame P:37    Avg QP:11.42  size:   149
[libx264 @ 000000000036d380] frame B:73    Avg QP:10.74  size:    30
[libx264 @ 000000000036d380] consecutive B-frames:  7.2% 14.4%  2.7% 75.7%
[libx264 @ 000000000036d380] mb I  I16..4: 95.5%  2.7%  1.8%
[libx264 @ 000000000036d380] mb P  I16..4:  4.9%  3.1%  0.1%  P16..4:  0.1%  0.0%  0.0%  0.0%  0.0%    skip:91.7%
[libx264 @ 000000000036d380] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.4%  0.0%  0.0%  direct: 0.0%  skip:99.6%  L0:48.6% L1:51.4% BI: 0
.0%
[libx264 @ 000000000036d380] 8x8 transform intra:29.1% inter:7.7%
[libx264 @ 000000000036d380] coded y,uvDC,uvAC intra: 0.6% 2.0% 0.9% inter: 0.0% 0.0% 0.0%
[libx264 @ 000000000036d380] i16 v,h,dc,p: 83% 15%  2%  0%
[libx264 @ 000000000036d380] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  2%  8% 90%  0%  0%  0%  0%  0%  0%
[libx264 @ 000000000036d380] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 29% 24% 43%  0%  1%  0%  1%  0%  1%
[libx264 @ 000000000036d380] i8c dc,h,v,p: 82% 12%  5%  0%
[libx264 @ 000000000036d380] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 000000000036d380] ref P L0: 62.1%  1.9% 35.9%
[libx264 @ 000000000036d380] ref B L0: 73.5% 22.9%  3.6%
[libx264 @ 000000000036d380] kb/s:7.28