C920 h264 problem

arkwaw@ubuntu:~/obraz/ffmpeg$ ./ffmpeg -f v4l2 -input_format h264 -i /dev/video1 -c:v copy output.mkv
ffmpeg version N-52847-g9276467 Copyright (c) 2000-2013 the FFmpeg developers
  built on May  7 2013 13:28:41 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  configuration:
  libavutil      52. 30.100 / 52. 30.100
  libavcodec     55.  7.100 / 55.  7.100
  libavformat    55.  4.101 / 55.  4.101
  libavdevice    55.  0.100 / 55.  0.100
  libavfilter     3. 63.101 /  3. 63.101
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
Input #0, video4linux2,v4l2, from '/dev/video1':
  Duration: N/A, start: 5376.522436, bitrate: N/A
    Stream #0:0: Video: h264 (Constrained Baseline), yuvj420p, 800x448 [SAR 1:1 DAR 25:14], -5 kb/s, 30 fps, 30 tbr, 1000k tbn, 60 tbc
File 'output.mkv' already exists. Overwrite ? [y/N] y
Output #0, matroska, to 'output.mkv':
  Metadata:
    encoder         : Lavf55.4.101
    Stream #0:0: Video: h264 (H264 / 0x34363248), yuvj420p, 800x448 [SAR 1:1 DAR 25:14], q=2-31, -5 kb/s, 30 fps, 1k tbn, 1000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
frame=    0 fps=0.0 q=-1.0 Lsize=       1kB time=00:00:00.00 bitrate=N/A
video:0kB audio:0kB subtitle:0 global headers:0kB muxing overhead inf%
Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)