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• Recording Camlink 4k feed with ffmpeg

  5 août 2020, par Nitzan Yogev

  its my first question ! awesome !
so im new to python, and im working on some program for work
I have the Elgato CamLink 4k connected to Sony A7III.
im looking for the best way to record a video file from the camlink feed using python
I know that ffmpeg is a good way to record webcam feed. but im having trouble with it
here is my code.

  


      import ffmpeg

(
    ffmpeg
    .input('0', format='avfoundation', pix_fmt='nv12', framerate=25)
    .output('test.mp4', pix_fmt='nv12', vframes=125)
    .overwrite_output()
    .run()
)


  


  im using this ffmpeg-python module

  


  im getting a output file with only the first frame and nothing more

  


  here is what im getting in the run terminal

  


  ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with Apple clang version 11.0.3 (clang-1103.0.32.62)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.1 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
  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
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
[avfoundation @ 0x7ff043814600] Stream #0: not enough frames to estimate rate; consider increasing probesize
Input #0, avfoundation, from '0':
  Duration: N/A, start: 6247.240967, bitrate: N/A
    Stream #0:0: Video: rawvideo (NV12 / 0x3231564E), nv12, 3840x2160, 1000k tbr, 1000k tbn, 1000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[mp4 @ 0x7ff043856c00] Frame rate very high for a muxer not efficiently supporting it.
Please consider specifying a lower framerate, a different muxer or -vsync 2
[libx264 @ 0x7ff043868000] MB rate (32400000000) > level limit (16711680)
[libx264 @ 0x7ff043868000] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x7ff043868000] profile High, level 6.2, 4:2:0, 8-bit
[libx264 @ 0x7ff043868000] 264 - core 160 r3011 cde9a93 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - 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=18 lookahead_threads=3 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=25 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 'test.mp4':
  Metadata:
    encoder         : Lavf58.45.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), nv12, 3840x2160, q=-1--1, 1000k fps, 1000k tbn, 1000k tbc
    Metadata:
      encoder         : Lavc58.91.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
frame=  125 fps= 30 q=-1.0 Lsize=     788kB time=00:00:00.00 bitrate=52509528.5kbits/s dup=124 drop=1 speed=2.99e-05x    
video:786kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.290685%
[libx264 @ 0x7ff043868000] frame I:1     Avg QP:19.49  size:588332
[libx264 @ 0x7ff043868000] frame P:31    Avg QP:20.24  size:  4202
[libx264 @ 0x7ff043868000] frame B:93    Avg QP:33.28  size:   922
[libx264 @ 0x7ff043868000] consecutive B-frames:  0.8%  0.0%  0.0% 99.2%
[libx264 @ 0x7ff043868000] mb I  I16..4:  2.8% 86.0% 11.3%
[libx264 @ 0x7ff043868000] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  6.9%  0.3%  0.5%  0.0%  0.0%    skip:92.3%
[libx264 @ 0x7ff043868000] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  4.4%  0.0%  0.0%  direct: 0.0%  skip:95.6%  L0:19.0% L1:81.0% BI: 0.0%
[libx264 @ 0x7ff043868000] 8x8 transform intra:86.0% inter:88.3%
[libx264 @ 0x7ff043868000] coded y,uvDC,uvAC intra: 93.8% 87.1% 55.6% inter: 0.1% 1.5% 0.0%
[libx264 @ 0x7ff043868000] i16 v,h,dc,p:  9% 10%  9% 72%
[libx264 @ 0x7ff043868000] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15% 14% 34%  6%  5%  5%  6%  7%  7%
[libx264 @ 0x7ff043868000] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 18% 16%  9%  8%  7%  8%  7%  6%
[libx264 @ 0x7ff043868000] i8c dc,h,v,p: 48% 26% 20%  6%
[libx264 @ 0x7ff043868000] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x7ff043868000] ref P L0: 82.6%  0.1% 14.0%  3.3%
[libx264 @ 0x7ff043868000] ref B L0: 99.8%  0.2%  0.0%
[libx264 @ 0x7ff043868000] ref B L1: 76.2% 23.8%
[libx264 @ 0x7ff043868000] kb/s:51475456.00


  


  if im plugging the camlink off I get a video from my macbook internal camera. so I know this should somehow work

  


• FFMPEG Transcode VP8 to H264 from rtp stream

  5 août 2020, par Akil

  I have a rtp stream, the server is receiving audio and video on 2 separate ports, the video is in VP8 and the audio is in Opus.

  


  My ultimate goal is to convert the RTP stream to RTMP to stream to Youtube Live, but Youtube Live supports only H264 https://developers.google.com/youtube/v3/live/guides/ingestion-protocol-comparison so first i'm looking to transcode my RTP stream to H264.

  


  I've run the below command

  


  ffmpeg -analyzeduration 300M -probesize 300M -protocol_whitelist file,udp,rtp -i test.sdp -c:v libx264  -pix_fmt yuv420p -r 25 -c:a aac -f flv youtube_rtmp_url


  


  My sdp file

  


  v=0
o=- 0 0 IN IP4 127.0.0.1
s=RTP Video
c=IN IP4 127.0.0.1
t=0 0
a=tool:libavformat 55.2.100
m=audio 50000 RTP/AVP 111
a=rtpmap:111 OPUS/48000
m=video 50002 RTP/AVP 100
a=rtpmap:100 VP8/90000
a=fmtp:100 packetization-mode=1


  


  Where 50000 and 50002 are the ports which receive the rtp video and audio.

  


  Log output :

  


  ffmpeg version 4.3-3ubuntu1~18.04.sav0 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
configuration: --prefix=/usr --extra-version='3ubuntu1~18.04.sav0' --toolchain=hardened 
--libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 
--enable-gpl --disable-stripping --enable-avresample --disable-filter=resample 
--enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray 
--enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d 
--enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi 
--enable-libgme               
--enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg 
--enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librsvg 
--enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr 
--enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame 
--enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp 
--enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi 
--enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 -- 
enable-pocketsphinx --enable-crystalhd --enable-libmfx --enable-libdc1394 --enable-libdrm -- 
enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 -- 
enable-shared
  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
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
  [sdp @ 0x5649eef4b8c0] Could not find codec parameters for stream 1 (Video: vp8, yuv420p): 
  unspecified size

  Consider increasing the value for the 'analyzeduration' and 'probesize' options
    Input #0, sdp, from 'test.sdp':
     Metadata:
       title           : RTP Video
       Duration: N/A, start: 0.000000, bitrate: N/A
         Stream #0:0: Audio: opus, 48000 Hz, mono, fltp
         Stream #0:1: Video: vp8, yuv420p, 90k tbr, 90k tbn, 90k tbc
      [rtmp @ 0x5649eefd87c0] Cannot open connection tcp://a.rtmp.youtube.com:1935
      rtmp://a.rtmp.youtube.com/live2/_______: Immediate exit requested


  


  I've increased 'analyzeduration' and 'probesize' values, error doesn't change.

  


• kmsgrab : Use GetFB2 if available

  5 juillet 2020, par Mark Thompson

  kmsgrab : Use GetFB2 if available
  The most useful feature here is the ability to automatically extract the
  
  framebuffer format and modifiers.  It also makes support for multi-plane
  
  framebuffers possible, though none are added to the format table in this
  
  patch.
  This requires libdrm 2.4.101 (from April 2020) to build, so it includes a
  
  configure check to allow compatibility with existing distributions.  Even
  
  with libdrm support, it still won't do anything at runtime if you are
  
  running Linux < 5.7 (before June 2020).
  

  • [DH] configure
  • [DH] libavdevice/kmsgrab.c