X:\ffmpeg>ffmpeg -rtsp_transport tcp -i "rtsp://[censored]/h264/ch3/sub/av_stream" -c:v libx264 -y "X:\h264frames\libx264rtsp.mp4"
ffmpeg version N-89505-g7c1a78b6af Copyright (c) 2000-2017 the FFmpeg developers
  built with Microsoft (R) C/C++ Optimizing Compiler Version 19.00.24215.1 for x86
  configuration: --toolchain=msvc --disable-ffserver --disable-doc --disable-encoders --disable-decoders --disable-filters --disable-demuxers --disable-muxers --disable-protocols --disable-parsers --disable-hwaccels --disable-bsfs --disable-indevs --disable-outdevs --enable-libx264 --enable-libmfx --disable-swscale-alpha --enable-gpl --enable-decoder='mjpeg,mjpegb,mpeg4,h264,h264_qsv,h264_cuvid' --enable-encoder='mpeg4,h264,h264_qsv,libx264,mjpeg_qsv,h264_nvenc' --enable-demuxer='rtsp,rtp,sdp,yuv4mpegpipe' --enable-muxer='mp4,h264,yuv4mpegpipe' --enable-protocol='file,rtp,srtp,http,https,httpproxy' --enable-parser='h264,mpeg4video' --enable-hwaccel='h264_qsv,h264_cuvid,h264_d3d11va2,mjpeg_cuvid,mpeg4_cuvid,h264_dxva2' --enable-filter=scale
  libavutil      56.  5.100 / 56.  5.100
  libavcodec     58.  7.100 / 58.  7.100
  libavformat    58.  3.100 / 58.  3.100
  libavdevice    58.  0.100 / 58.  0.100
  libavfilter     7.  7.100 /  7.  7.100
  libswscale      5.  0.101 /  5.  0.101
  libswresample   3.  0.101 /  3.  0.101
  libpostproc    55.  0.100 / 55.  0.100
Input #0, rtsp, from 'rtsp://[censored]/h264/ch3/sub/av_stream':
  Metadata:
    title           : Media Server V3.5.20
    comment         : Media Server Session Description : standard
  Duration: N/A, start: 0.953333, bitrate: N/A
    Stream #0:0: Video: h264 (High), yuvj420p(pc, bt709, progressive), 704x480, 6 fps, 6.25 tbr, 90k tbn, 12 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 057B23C0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 UnalignedStack
[libx264 @ 057B23C0] profile High, level 2.2
[libx264 @ 057B23C0] 264 - core 152 r2851 ba24899 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=6 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'X:\h264frames\libx264rtsp.mp4':
  Metadata:
    title           : Media Server V3.5.20
    comment         : Media Server Session Description : standard
    encoder         : Lavf58.3.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuvj420p(pc), 704x480, q=-1--1, 6.25 fps, 12800 tbn, 6.25 tbc
    Metadata:
      encoder         : Lavc58.7.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
frame=  148 fps=7.6 q=-1.0 Lsize=     932kB time=00:00:23.20 bitrate= 329.0kbits/s dup=0 drop=4 speed=1.19x
video:929kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.286112%
[libx264 @ 057B23C0] frame I:1     Avg QP:18.14  size: 48829
[libx264 @ 057B23C0] frame P:49    Avg QP:17.50  size: 17256
[libx264 @ 057B23C0] frame B:98    Avg QP:23.52  size:   575
[libx264 @ 057B23C0] consecutive B-frames:  1.4% 31.1%  0.0% 67.6%
[libx264 @ 057B23C0] mb I  I16..4: 11.4% 40.2% 48.4%
[libx264 @ 057B23C0] mb P  I16..4:  0.7%  2.6%  0.8%  P16..4: 36.9% 15.4% 11.0%  0.0%  0.0%    skip:32.5%
[libx264 @ 057B23C0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8: 18.8%  0.4%  0.1%  direct: 0.3%  skip:80.5%  L0:56.2% L1:40.3% BI: 3.5%
[libx264 @ 057B23C0] 8x8 transform intra:55.6% inter:37.2%
[libx264 @ 057B23C0] coded y,uvDC,uvAC intra: 83.1% 55.8% 22.4% inter: 16.1% 15.8% 2.6%
[libx264 @ 057B23C0] i16 v,h,dc,p: 17% 16% 30% 38%
[libx264 @ 057B23C0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 25% 20%  5%  5%  4% 10%  8%  7%
[libx264 @ 057B23C0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 28% 18%  6%  6%  4% 10%  5%  6%
[libx264 @ 057B23C0] i8c dc,h,v,p: 39% 29% 22% 10%
[libx264 @ 057B23C0] Weighted P-Frames: Y:4.1% UV:0.0%
[libx264 @ 057B23C0] ref P L0: 59.0% 11.4% 11.0% 18.5%  0.1%
[libx264 @ 057B23C0] ref B L0: 84.2% 15.1%  0.7%
[libx264 @ 057B23C0] ref B L1: 99.0%  1.0%
[libx264 @ 057B23C0] kb/s:321.18
Exiting normally, received signal 2.