./ffmpeg -f rtsp -i rtsp://s01.xx.tv/fb/xx.stream?lp=xx== -vcodec copy -acodec copy /home/test4.avi
ffmpeg version N-46943-g4bf3bc6 Copyright (c) 2000-2012 the FFmpeg developers
  built on Nov 21 2012 18:23:45 with gcc 4.4.5 (Debian 4.4.5-8)
  configuration: --enable-librtmp --enable-pthreads
  libavutil      52.  8.100 / 52.  8.100
  libavcodec     54. 74.100 / 54. 74.100
  libavformat    54. 37.100 / 54. 37.100
  libavdevice    54.  3.100 / 54.  3.100
  libavfilter     3. 23.101 /  3. 23.101
  libswscale      2.  1.102 /  2.  1.102
  libswresample   0. 17.101 /  0. 17.101
RTP: missed 3 packets
RTP: missed 1 packets
RTP: missed 4 packets
RTP: missed 30 packets
[rtsp @ 0x15701e0] PES packet size mismatch
RTP: missed 17 packets
[rtsp @ 0x15701e0] PES packet size mismatch
    Last message repeated 1 times
[NULL @ 0x15b3e80] non-existing PPS referenced
[h264 @ 0x15b3e80] non-existing PPS 0 referenced
[h264 @ 0x15b3e80] decode_slice_header error
[h264 @ 0x15b3e80] no frame!
RTP: missed 12 packets
[h264 @ 0x15b3e80] non-existing PPS referenced
[h264 @ 0x15b3e80] non-existing PPS 0 referenced
[h264 @ 0x15b3e80] decode_slice_header error
[h264 @ 0x15b3e80] no frame!
RTP: missed 22 packets
RTP: missed 18 packets
RTP: missed 6 packets
[rtsp @ 0x15701e0] PES packet size mismatch
[h264 @ 0x15b3e80] non-existing PPS referenced
[h264 @ 0x15b3e80] non-existing PPS 0 referenced
[h264 @ 0x15b3e80] decode_slice_header error
[h264 @ 0x15b3e80] no frame!
RTP: missed 7 packets
RTP: missed 15 packets
RTP: missed 19 packets
RTP: missed 22 packets
RTP: missed 21 packets
RTP: missed 6 packets
[rtsp @ 0x15701e0] max_analyze_duration 5000000 reached at 5016000
[rtsp @ 0x15701e0] decoding for stream 0 failed
[rtsp @ 0x15701e0] Could not find codec parameters for stream 0 (Video: h264 ([27][0][0][0] / 0x001B)): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options
[rtsp @ 0x15701e0] Estimating duration from bitrate, this may be inaccurate
Input #0, rtsp, from 'rtsp://s01.xx.tv/fb/xx.stream?lp=xx==':
  Metadata:
    title           : rtmp://xx.xx.com:1935/s2/_definst_/xx.stream
  Duration: N/A, start: 3209.341000, bitrate: 128 kb/s
  Program 1
    Stream #0:0: Video: h264 ([27][0][0][0] / 0x001B), 1 tbr, 90k tbn
    Stream #0:1: Audio: mp3 ([4][0][0][0] / 0x0004), 48000 Hz, stereo, s16, 128 kb/s
File '/home/test4.avi' already exists. Overwrite ? [y/N] y
Output #0, avi, to '/home/test4.avi':
  Metadata:
    INAM            : rtmp://xx.xx.com:1935/s2/_definst_/xx.stream
    ISFT            : Lavf54.37.100
    Stream #0:0: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, 128 kb/s
Stream mapping:
  Stream #0:1 -> #0:0 (copy)
Press [q] to stop, [?] for help
RTP: missed 8 packets