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• How to transfer video as rtp stream with least delay by FFmpeg

  2 décembre 2020, par Yasushi2019

  I use AXIS M1045-LW supporting rtsp/http access, and my Windows 10 PC can access to the camera through LAN.

  


  I would like to transfer the video as rtp with keeping H.264 codec which is supported by the camera.

  


  ---

  


  Image

  


  [Camera] == (rtsp or http) ==> [FFmpeg on Win10] == (rtp) ==>

  


  ---

  


  When I accessed the camera through Google Chrome on my Win10 PC, there is only 1 or 2 sec delay.

  


  However, when I tried access by the following command, I found over 10 sec delay.

  


  How could I reduce the delay as much as possible ?

  


  ---

  


  [Windows Command Prompt A ] (sender)

  


  
C :\Users\xxxx\ffmpeg-4.3.1-2020-11-19-full_build\bin>ffmpeg -re -i rtsp ://xxx:xxx@xxx.xxx.xxx.xxx/axis-media/media.amp -codec:v copy -f rtp rtp ://localhost:30002 -sdp_file stream.sdp

ffmpeg version 4.3.1-2020-11-19-full_build-www.gyan.dev Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 10.2.0 (Rev5, Built by MSYS2 project)
  configuration : —enable-gpl —enable-version3 —enable-static —disable-w32threads —disable-autodetect —enable-fontconfig —enable-iconv —enable-gnutls —enable-libxml2 —enable-gmp —enable-lzma —enable-libsnappy —enable-zlib —enable-libsrt —enable-libssh —enable-libzmq —enable-avisynth —enable-libbluray —enable-libcaca —enable-sdl2 —enable-libdav1d —enable-libzvbi —enable-librav1e —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxvid —enable-libaom —enable-libopenjpeg —enable-libvpx —enable-libass —enable-frei0r —enable-libfreetype —enable-libfribidi —enable-libvidstab —enable-libvmaf —enable-libzimg —enable-amf —enable-cuda-llvm —enable-cuvid —enable-ffnvcodec —enable-nvdec —enable-nvenc —enable-d3d11va —enable-dxva2 —enable-libmfx —enable-libcdio —enable-libgme —enable-libmodplug —enable-libopenmpt —enable-libopencore-amrwb —enable-libmp3lame —enable-libshine —enable-libtheora —enable-libtwolame —enable-libvo-amrwbenc —enable-libilbc —enable-libgsm —enable-libopencore-amrnb —enable-libopus —enable-libspeex —enable-libvorbis —enable-ladspa —enable-libbs2b —enable-libflite —enable-libmysofa —enable-librubberband —enable-libsoxr —enable-chromaprint
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, rtsp, from 'rtsp ://xxx:xxx@xxx.xxx.xxx.xxx/axis-media/media.amp' :
  Metadata :
    title : Session streamed with GStreamer
    comment : rtsp-server
  Duration : N/A, start : 2.979633, bitrate : N/A
    Stream #0:0 : Video : h264 (Baseline), yuvj420p(pc, bt709, progressive), 320x240 [SAR 1:1 DAR 4:3], 2 fps, 25 tbr, 90k tbn, 4 tbc
Output #0, rtp, to 'rtp ://localhost:30002' :
  Metadata :
    title : Session streamed with GStreamer
    comment : rtsp-server
    encoder : Lavf58.45.100
    Stream #0:0 : Video : h264 (Baseline), yuvj420p(pc, bt709, progressive), 320x240 [SAR 1:1 DAR 4:3], q=2-31, 2 fps, 25 tbr, 90k tbn, 2 tbc
Stream mapping :
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
[rtp @ 000002da44da33c0] Non-monotonous DTS in output stream 0:0 ; previous : 0, current : -224986 ; changing to 0. This may result in incorrect timestamps in the output file.
[rtp @ 000002da44da33c0] Non-monotonous DTS in output stream 0:0 ; previous : 0, current : -178194 ; changing to 0. This may result in incorrect timestamps in the output file.
[rtp @ 000002da44da33c0] Non-monotonous DTS in output stream 0:0 ; previous : 0, current : -134998 ; changing to 0. This may result in incorrect timestamps in the output file.
[rtp @ 000002da44da33c0] Non-monotonous DTS in output stream 0:0 ; previous : 0, current : -88201 ; changing to 0. This may result in incorrect timestamps in the output file.
[rtp @ 000002da44da33c0] Non-monotonous DTS in output stream 0:0 ; previous : 0, current : -45002 ; changing to 0. This may result in incorrect timestamps in the output file.
frame=   89 fps=2.1 q=-1.0 size=     142kB time=00:00:43.01 bitrate=  27.0kbits/s speed=   1x


  


  [Windows Command Prompt B ] (receiver)

  


  
C :\Users\xxx\ffmpeg-4.3.1-2020-11-19-full_build\bin>ffplay -protocol_whitelist "file,udp,rtp" stream.sdp

ffplay version 4.3.1-2020-11-19-full_build-www.gyan.dev Copyright (c) 2003-2020 the FFmpeg developers
  built with gcc 10.2.0 (Rev5, Built by MSYS2 project)
  configuration : —enable-gpl —enable-version3 —enable-static —disable-w32threads —disable-autodetect —enable-fontconfig —enable-iconv —enable-gnutls —enable-libxml2 —enable-gmp —enable-lzma —enable-libsnappy —enable-zlib —enable-libsrt —enable-libssh —enable-libzmq —enable-avisynth —enable-libbluray —enable-libcaca —enable-sdl2 —enable-libdav1d —enable-libzvbi —enable-librav1e —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxvid —enable-libaom —enable-libopenjpeg —enable-libvpx —enable-libass —enable-frei0r —enable-libfreetype —enable-libfribidi —enable-libvidstab —enable-libvmaf —enable-libzimg —enable-amf —enable-cuda-llvm —enable-cuvid —enable-ffnvcodec —enable-nvdec —enable-nvenc —enable-d3d11va —enable-dxva2 —enable-libmfx —enable-libcdio —enable-libgme —enable-libmodplug —enable-libopenmpt —enable-libopencore-amrwb —enable-libmp3lame —enable-libshine —enable-libtheora —enable-libtwolame —enable-libvo-amrwbenc —enable-libilbc —enable-libgsm —enable-libopencore-amrnb —enable-libopus —enable-libspeex —enable-libvorbis —enable-ladspa —enable-libbs2b —enable-libflite —enable-libmysofa —enable-librubberband —enable-libsoxr —enable-chromaprint
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
[sdp @ 000001832f4ecec0] decoding for stream 0 failed    0B f=0/0
Input #0, sdp, from 'stream.sdp' :
  Metadata :
    title : Session streamed with GStreamer
  Duration : N/A, bitrate : N/A
    Stream #0:0 : Video : h264 (Baseline), yuvj420p(pc, bt709, progressive), 320x240 [SAR 1:1 DAR 4:3], 2 fps, 2 tbr, 90k tbn, 4 tbc
[swscaler @ 0000018336868d00] deprecated pixel format used, make sure you did set range correctly
 127.52 M-V : -0.021 fd=  12 aq=    0KB vq=   11KB sq=    0B f=0/0


  


• doc/encoders : fix the misleading usage of profile

  20 juin 2020, par Limin Wang

  doc/encoders : fix the misleading usage of profile
  users are getting mislead by the integer, although profile
  
  can support both const string and integer.
  
  http://ffmpeg.org/pipermail/ffmpeg-user/2020-June/049025.html
  Also fix the order of high and main, it's not my intention.
  Signed-off-by : Limin Wang <lance.lmwang@gmail.com>
  

  • [DH] doc/encoders.texi

• colorspace : Add support for BT709

  24 avril 2016, par Jan Ekström

  colorspace : Add support for BT709
  BT.709 coefficients were gathered from the first two parts of BT.709
  
  to BT.2020 conversion guide in ARIB STD-B62 (Pt. 1, Chapter 6.2.2).
  
  They were additionally confirmed by manually calculating values.
  

  • [DBH] libavutil/colorspace.h