$ ffmpeg -v verbose -f video4linux2 -s 720x487 -pix_fmt uyvy422 -i /dev/video0 -c:v libx264 -preset ultrafast cast.mkv
ffmpeg version 1.0 Copyright (c) 2000-2012 the FFmpeg developers
  built on Oct 23 2012 21:43:58 with gcc 4.7.2 (GCC)
  configuration: --prefix=/usr --enable-libmp3lame --enable-libvorbis --enable-libxvid --enable-libx264 --enable-libvpx --enable-libtheora --enable-libgsm --enable-libspeex --enable-postproc --enable-shared --enable-x11grab --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libschroedinger --enable-libopenjpeg --enable-librtmp --enable-libpulse --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libfdk-aac --enable-libaacplus --enable-libv4l2 --enable-gpl --enable-nonfree --enable-version3 --enable-runtime-cpudetect --disable-debug --disable-static
  libavutil      51. 73.101 / 51. 73.101
  libavcodec     54. 59.100 / 54. 59.100
  libavformat    54. 29.104 / 54. 29.104
  libavdevice    54.  2.101 / 54.  2.101
  libavfilter     3. 17.100 /  3. 17.100
  libswscale      2.  1.101 /  2.  1.101
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
[video4linux2,v4l2 @ 0x183a420] [3]Capabilities: 5000001
[video4linux2,v4l2 @ 0x183a420] The v4l2 frame is 570240 bytes, but 701280 bytes are expected
[video4linux2,v4l2 @ 0x183a420] Estimating duration from bitrate, this may be inaccurate
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, bitrate: 168139 kb/s
    Stream #0:0: Video: rawvideo (UYVY / 0x59565955), uyvy422, 720x487, 168139 kb/s, 29.97 tbr, 1000k tbn, 29.97 tbc
File 'cast.mkv' already exists. Overwrite ? [y/N] y
w:720 h:487 pixfmt:uyvy422 tb:1/1000000 fr:30000/1001 sar:0/1 sws_param:flags=2
[format @ 0x183fe80] auto-inserting filter 'auto-inserted scaler 0' between the filter 'Parsed_null_0' and the filter 'format'
[auto-inserted scaler 0 @ 0x183f7c0] w:720 h:487 fmt:uyvy422 sar:0/1 -> w:720 h:487 fmt:yuv422p sar:0/1 flags:0x4
[libx264 @ 0x183bc20] using cpu capabilities: MMX2 SSE2Slow SlowCTZ
[libx264 @ 0x183bc20] profile High 4:2:2, level 3.1, 4:2:2 8-bit
[libx264 @ 0x183bc20] 264 - core 124 - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
Output #0, matroska, to 'cast.mkv':
  Metadata:
    encoder         : Lavf54.29.104
    Stream #0:0: Video: h264, yuv422p, 720x487, q=-1--1, 1k tbn, 29.97 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo -> libx264)
Press [q] to stop, [?] for help
frame=   20 fps=0.0 q=22.0 size=     193kB time=375437:23:39.19 bitrate=   0.0kbframe=   36 fps= 34 q=22.0 size=     353kB time=375437:23:39.72 bitrate=   0.0kbframe=   51 fps= 33 q=22.0 size=     513kB time=375437:23:40.22 bitrate=   0.0kbframe=   67 fps= 32 q=22.0 size=     705kB time=375437:23:40.76 bitrate=   0.0kbframe=   83 fps= 31 q=22.0 size=     865kB time=375437:23:41.29 bitrate=   0.0kbframe=   98 fps= 31 q=22.0 size=     993kB time=375437:23:41.79 bitrate=   0.0kbframe=  114 fps= 31 q=22.0 size=    1187kB time=375437:23:42.33 bitrate=   0.0kbframe=  130 fps= 31 q=22.0 size=    1347kB time=375437:23:42.86 bitrate=   0.0kbframe=  146 fps= 31 q=22.0 size=    1507kB time=375437:23:43.39 bitrate=   0.0kbframe=  162 fps= 31 q=22.0 size=    1699kB time=375437:23:43.93 bitrate=   0.0kbframe=  177 fps= 31 q=22.0 size=    1859kB time=375437:23:44.43 bitrate=   0.0kbframe=  192 fps= 31 q=22.0 size=    1987kB time=375437:23:44.93 bitrate=   0.0kbframe=  207 fps= 31 q=22.0 size=    2179kB time=375437:23:45.43 bitrate=   0.0kbframe=  223 fps= 31 q=22.0 size=    2339kB time=375437:23:45.96 bitrate=   0.0kbframe=  238 fps= 30 q=22.0 size=    2499kB time=375437:23:46.46 bitrate=   0.0kbframe=  253 fps= 30 q=19.0 size=    2659kB time=375437:23:46.96 bitrate=   0.0kbframe=  268 fps= 30 q=22.0 size=    2861kB time=375437:23:47.47 bitrate=   0.0kbframe=  284 fps= 30 q=22.0 size=    3021kB time=375437:23:48.00 bitrate=   0.0kbframe=  300 fps= 30 q=22.0 size=    3213kB time=375437:23:48.53 bitrate=   0.0kbframe=  315 fps= 30 q=22.0 size=    3373kB time=375437:23:49.03 bitrate=   0.0kbframe=  330 fps= 30 q=22.0 size=    3533kB time=375437:23:49.53 bitrate=   0.0kbframe=  346 fps= 30 q=22.0 size=    3693kB time=375437:23:50.07 bitrate=   0.0kbframe=  361 fps= 30 q=22.0 size=    3885kB time=375437:23:50.57 bitrate=   0.0kbframe=  376 fps= 30 q=22.0 size=    4045kB time=375437:23:51.07 bitrate=   0.0kbframe=  381 fps=8.1 q=32766.0 Lsize=    4159kB time=375437:23:51.37 bitrate=   0.0kbits/s
video:4155kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.077602%
[libx264 @ 0x183bc20] frame I:2     Avg QP:19.50  size: 43912
[libx264 @ 0x183bc20] frame P:379   Avg QP:22.03  size: 10994
[libx264 @ 0x183bc20] mb I  I16..4: 100.0%  0.0%  0.0%
[libx264 @ 0x183bc20] mb P  I16..4:  5.9%  0.0%  0.0%  P16..4: 42.0%  0.0%  0.0%  0.0%  0.0%    skip:52.1%
[libx264 @ 0x183bc20] coded y,uvDC,uvAC intra: 13.2% 66.2% 20.3% inter: 19.4% 38.5% 12.8%
[libx264 @ 0x183bc20] i16 v,h,dc,p: 77% 11%  8%  4%
[libx264 @ 0x183bc20] i8c dc,h,v,p: 54% 12% 29%  5%
[libx264 @ 0x183bc20] kb/s:2405.78
Received signal 2: terminating.