pause2fast

ffmpeg -t 00:01:00 -r 30 -i rtsp://192.168.1.169/live.sdp -f matroska -acodec copy -vcodec mpeg4 -r 25 -qscale 0.1 pvwaiting_`date +%F_%H`.mkv
FFmpeg version 0.6.5, Copyright (c) 2000-2010 the FFmpeg developers
  built on Jan 29 2012 17:52:15 with gcc 4.4.5 20110214 (Red Hat 4.4.5-6)
  configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --incdir=/usr/include --disable-avisynth --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --enable-avfilter --enable-avfilter-lavf --enable-libdc1394 --enable-libdirac --enable-libfaac --enable-libfaad --enable-libfaadbin --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libx264 --enable-gpl --enable-nonfree --enable-postproc --enable-pthreads --enable-shared --enable-swscale --enable-vdpau --enable-version3 --enable-x11grab
  libavutil     50.15. 1 / 50.15. 1
  libavcodec    52.72. 2 / 52.72. 2
  libavformat   52.64. 2 / 52.64. 2
  libavdevice   52. 2. 0 / 52. 2. 0
  libavfilter    1.19. 0 /  1.19. 0
  libswscale     0.11. 0 /  0.11. 0
  libpostproc   51. 2. 0 / 51. 2. 0
[rtsp @ 0x21c8670]Estimating duration from bitrate, this may be inaccurate
Input #0, rtsp, from 'rtsp://192.168.1.169/live.sdp':
  Metadata:
    title           : RTSP server
  Duration: N/A, start: 0.-185034, bitrate: N/A
    Stream #0.0: Video: mpeg4, yuv420p, 640x480 [PAR 1:1 DAR 4:3], 30 fps, 30 tbr, 90k tbn, 30 tbc
    Stream #0.1: Audio: aac, 44100 Hz, stereo, s16
Output #0, matroska, to 'pvwaiting_2013-11-25_15.mkv':
  Metadata:
    encoder         : Lavf52.64.2
    Stream #0.0: Video: mpeg4, yuv420p, 640x480 [PAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 1k tbn, 25 tbc
    Stream #0.1: Audio: libfaac, 44100 Hz, stereo
Stream mapping:
  Stream #0.0 -> #0.0
  Stream #0.1 -> #0.1
Press [q] to stop encoding
frame=  551 fps=  9 q=0.1 Lsize=   19477kB time=59.72 bitrate=2671.7kbits/s dup=0 drop=1038
video:18517kB audio:936kB global headers:0kB muxing overhead 0.121085%