Miscellany

cat /dev/video0 | ffmpeg \
> -threads 3 \
> -i - \
> -t 15 \
> -vcodec h264 \
> -b 700kb/s \
> -r 29.97 \
> -acodec aac \
> -ab 128kb/s \
> -ac 2 \
> -alang eng \
> -deinterlace \
> tmp.mp4
FFmpeg version SVN-rUNKNOWN, Copyright (c) 2000-2007 Fabrice Bellard, et al.
  configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --enable-static --enable-shared --cc=x86_64-pc-linux-gnu-gcc --disable-altivec --disable-debug --disable-audio-oss --disable-v4l --disable-v4l2 --disable-dv1394 --disable-network --disable-ffplay --disable-opts --enable-libmp3lame --enable-libvorbis --enable-libogg --enable-libtheora --enable-libogg --enable-liba52 --enable-pthreads --enable-xvid --enable-x11grab --enable-libogg --enable-x264 --enable-libfaad --enable-libfaac --enable-gpl --enable-pp --disable-strip
  libavutil version: 49.4.0
  libavcodec version: 51.40.2
  libavformat version: 51.11.0
  built on Sep 24 2007 15:51:36, gcc: 4.1.1 (Gentoo 4.1.1-r3)
Input #0, mpeg, from 'pipe:':
  Duration: N/A, bitrate: 8224 kb/s
  Stream #0.0[0x1e0]: Video: mpeg2video, yuv420p, 720x480, 8000 kb/s, 29.97 fps(r)
  Stream #0.1[0x1c0]: Audio: mp2, 48000 Hz, stereo, 224 kb/s
Output #0, mp4, to 'tmp.mp4':
  Stream #0.0: Video: h264, yuv420p, 720x480, q=2-31, 700 kb/s, 29.97 fps(c)
  Stream #0.1(eng): Audio: aac, 48000 Hz, stereo, 128 kb/s
Stream mapping:
  Stream #0.0 -> #0.0
  Stream #0.1 -> #0.1
x264 [error]: invalid width x height (0x720)
Error while opening codec for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height