k♥t ffmpeg -i /tmp/parte-%02d.pbm -r 1 parte.mp4
ffmpeg version 0.7.6, Copyright (c) 2000-2011 the FFmpeg developers
  built on Oct  3 2011 13:04:32 with gcc 4.6.1 20110819 (prerelease)
  configuration: --prefix=/usr --enable-libmp3lame --enable-libvorbis --enable-libxvid --enable-libx264 --enable-libvpx --enable-libtheora --enable-postproc --enable-shared --enable-x11grab --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libschroedinger --enable-libopenjpeg --enable-librtmp --enable-gpl --enable-version3 --enable-runtime-cpudetect --disable-debug
  libavutil    50. 43. 0 / 50. 43. 0
  libavcodec   52.122. 0 / 52.122. 0
  libavformat  52.110. 0 / 52.110. 0
  libavdevice  52.  5. 0 / 52.  5. 0
  libavfilter   1. 80. 0 /  1. 80. 0
  libswscale    0. 14. 1 /  0. 14. 1
  libpostproc  51.  2. 0 / 51.  2. 0
Input #0, image2, from '/tmp/parte-%02d.pbm':
  Duration: 00:00:00.28, start: 0.000000, bitrate: N/A
    Stream #0.0: Video: pbm, monow, 1920x1080, 25 tbr, 25 tbn, 25 tbc
Incompatible pixel format 'monow' for codec 'mpeg4', auto-selecting format 'yuv420p'
[buffer @ 0x15df740] w:1920 h:1080 pixfmt:monow tb:1/1000000 sar:0/1 sws_param:
[buffersink @ 0x15d5640] auto-inserting filter 'auto-inserted scaler 0' between the filter 'src' and the filter 'out'
[scale @ 0x15d5d40] w:1920 h:1080 fmt:monow -> w:1920 h:1080 fmt:yuv420p flags:0x4
Output #0, mp4, to 'parte.mp4':
  Metadata:
    encoder         : Lavf52.110.0
    Stream #0.0: Video: mpeg4, yuv420p, 1920x1080, q=2-31, 200 kb/s, 1 tbn, 1 tbc
Stream mapping:
  Stream #0.0 -> #0.0
Press [q] to stop, [?] for help
frame=    2 fps=  0 q=2.0 Lsize=    1097kB time=00:00:02.00 bitrate=4492.3kbits/s dup=0 drop=5    
video:1096kB audio:0kB global headers:0kB muxing overhead 0.070303%
k♥t