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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 - Split Window RTMP - Delay on Second Stream

  22 février 2016, par Nick Smit

  I’m trying to combine two live RTMP sources into one split screen output with combined audio. The output is then sent on to a receiving RTMP server.

  Using the following command, which uses the same RTMP input for both feeds, I’ve managed to get the above working, however the input on the left is delayed by about 2 seconds from the one on the right.

  ffmpeg -re -i rtmp://myserver.tld/live/stream_key -re -i rtmp://myserver.tld/live/stream_key \
  
  -filter_complex "\
  
  nullsrc=size=1152x720 [base];\
  
  [0:v] crop=576:720 [upperleft];\
  
  [1:v] crop=576:720 [upperright];\
  
  [base][upperleft] overlay=shortest=1 [tmp1];\
  
  [tmp1][upperright] overlay=shortest=1:x=576;\
  
  [0:a][1:a]amix \
  
  " -c:a libfdk_aac -ar 44100 -threads 32 -c:v libx264 -g 50 -preset ultrafast -tune zerolatency -f flv rtmp://myserver.tld/live/new_stream_key

  Output :

  ffmpeg version N-76137-gb0bb1dc Copyright (c) 2000-2015 the FFmpeg developers
  
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
  
  configuration: --prefix=/home/ubuntu/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/ubuntu/ffmpeg_build/include --extra-ldflags=-L/home/ubuntu/ffmpeg_build/lib --bindir=/home/ubuntu/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
  
  libavutil      55.  4.100 / 55.  4.100
  
  libavcodec     57.  7.100 / 57.  7.100
  
  libavformat    57.  8.102 / 57.  8.102
  
  libavdevice    57.  0.100 / 57.  0.100
  
  libavfilter     6. 12.100 /  6. 12.100
  
  libswscale      4.  0.100 /  4.  0.100
  
  libswresample   2.  0.100 /  2.  0.100
  
  libpostproc    54.  0.100 / 54.  0.100
  
  [flv @ 0x3a0e940] video stream discovered after head already parsed
  
  Input #0, flv, from 'rtmp://myserver.tld/live/stream_key':
  
  Metadata:
  
  Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
  
  displayWidth    : 1152
  
  displayHeight   : 720
  
  fps             : 29
  
  profile         :
  
  level           :
  
  Duration: 00:00:00.00, start: 5.717000, bitrate: N/A
  
  Stream #0:0: Audio: aac (LC), 48000 Hz, stereo, fltp, 163 kb/s
  
  Stream #0:1: Video: h264 (High), yuv420p, 1152x720, 30.30 fps, 29.97 tbr, 1k tbn, 59.94 tbc
  
  [flv @ 0x3a49e00] video stream discovered after head already parsed
  
  Input #1, flv, from 'rtmp://myserver.tld/live/stream_key':
  
  Metadata:
  
  Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
  
  displayWidth    : 1152
  
  displayHeight   : 720
  
  fps             : 29
  
  profile         :
  
  level           :
  
  Duration: 00:00:00.00, start: 9.685000, bitrate: N/A
  
  Stream #1:0: Audio: aac (LC), 48000 Hz, stereo, fltp, 163 kb/s
  
  Stream #1:1: Video: h264 (High), yuv420p, 1152x720, 30.30 fps, 29.97 tbr, 1k tbn, 59.94 tbc
  
  [libx264 @ 0x3a9cd60] Application has requested 32 threads. Using a thread count greater than 16 is not recommended.
  
  [libx264 @ 0x3a9cd60] using SAR=1/1
  
  [libx264 @ 0x3a9cd60] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0x3a9cd60] profile Constrained Baseline, level 3.1
  
  [libx264 @ 0x3a9cd60] 264 - core 142 r2389 956c8d8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=11 lookahead_threads=11 sliced_threads=1 slices=11 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=50 keyint_min=5 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
  
  Output #0, flv, to 'rtmp://myserver.tld/live/new_stream_key':
  
  Metadata:
  
  Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
  
  displayWidth    : 1152
  
  displayHeight   : 720
  
  fps             : 29
  
  profile         :
  
  level           :
  
  encoder         : Lavf57.8.102
  
  Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuv420p, 1152x720 [SAR 1:1 DAR 8:5], q=-1--1, 25 fps, 1k tbn, 25 tbc (default)
  
  Metadata:
  
  encoder         : Lavc57.7.100 libx264
  
  Stream #0:1: Audio: aac (libfdk_aac) ([10][0][0][0] / 0x000A), 44100 Hz, stereo, s16, 128 kb/s (default)
  
  Metadata:
  
  encoder         : Lavc57.7.100 libfdk_aac
  
  Stream mapping:
  
  Stream #0:0 (aac) -> amix:input0
  
  Stream #0:1 (h264) -> crop
  
  Stream #1:0 (aac) -> amix:input1
  
  Stream #1:1 (h264) -> crop
  
  overlay -> Stream #0:0 (libx264)
  
  amix -> Stream #0:1 (libfdk_aac)
  
  Press [q] to stop, [?] for help
  
  [flv @ 0x3a0e940] Thread message queue blocking; consider raising the thread_queue_size option (current value: 512)
  
  frame=   81 fps= 20 q=15.0 size=     674kB time=00:00:03.24 bitrate=1703.3kbits/frame=  102 fps= 22 q=22.0 size=     945kB time=00:00:04.08 bitrate=1896.4kbits/

  Is there any way to force FFMpeg to read both RTMP inputs at the same time ?

• Images to video in Prezi format

  13 juin 2016, par sammy34

  I have five *.jpeg image files : m01.jpeg to m05.jpeg.

  I’d like to make a video of a sequence of these five images and upload it to Prezi to use in a presentation.

  FFMPEG seems to be the tool for the job here. I am generating a video using the following command :

  ffmpeg -r 2 -i m%02d.jpeg -pix_fmt yuvj420p myvideo.mp4

  This generates a video that I can play fine locally. Unfortunately, when I try to upload the video to Prezi, I always get the following error...

  "Technical details: id: 2110 the reason is: Event [Event type="stateChange" bubbles=false cancelable=false eventPhase=2]"

  ...which isn’t particularly informative.

  If I upload a sample MP4 from the web to Prezi, it works fine.

  My question : Does anybody know what I need to give FFMPEG as parameters here so that it will generate a Prezi-compatible video from these images ?

  EDIT : As requested, here’s the complete console output for FFMPEG. Unfortunately there are no glaring warnings or errors that I can see.

  sam@x220sm:~/tmp$ ffmpeg -r 2 -i m%02d.jpeg -pix_fmt yuvj420p myvideo.mp4
  
  ffmpeg version 2.8.6-1ubuntu2 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.3.1 (Ubuntu 5.3.1-11ubuntu1) 20160311
  
    configuration: --prefix=/usr --extra-version=1ubuntu2 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
  
    libavutil      54. 31.100 / 54. 31.100
  
    libavcodec     56. 60.100 / 56. 60.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 40.101 /  5. 40.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101
  
    libpostproc    53.  3.100 / 53.  3.100
  
  [mjpeg @ 0xd8e620] Changeing bps to 8
  
  Input #0, image2, from 'm%02d.jpeg':
  
    Duration: 00:00:00.20, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 800x600 [SAR 1:1 DAR 4:3], 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  [libx264 @ 0xd910c0] using SAR=1/1
  
  [libx264 @ 0xd910c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0xd910c0] profile High, level 3.1
  
  [libx264 @ 0xd910c0] 264 - core 148 r2643 5c65704 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - 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=6 lookahead_threads=1 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=2 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 'myvideo.mp4':
  
    Metadata:
  
      encoder         : Lavf56.40.101
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuvj420p(pc), 800x600 [SAR 1:1 DAR 4:3], q=-1--1, 2 fps, 16384 tbn, 2 tbc
  
      Metadata:
  
        encoder         : Lavc56.60.100 libx264
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  frame=    5 fps=0.0 q=-1.0 Lsize=    1170kB time=00:00:01.50 bitrate=6390.8kbits/s    
  
  video:1169kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.073660%
  
  [libx264 @ 0xd910c0] frame I:1     Avg QP:25.54  size:289842
  
  [libx264 @ 0xd910c0] frame P:4     Avg QP:20.54  size:226716
  
  [libx264 @ 0xd910c0] mb I  I16..4:  0.0%  0.2% 99.8%
  
  [libx264 @ 0xd910c0] mb P  I16..4: 16.8% 23.8% 59.4%  P16..4:  0.0%  0.0%  0.0%  0.0%  0.0%    skip: 0.0%
  
  [libx264 @ 0xd910c0] 8x8 transform intra:19.1% inter:0.0%
  
  [libx264 @ 0xd910c0] coded y,uvDC,uvAC intra: 84.5% 85.6% 79.2% inter: 50.0% 100.0% 100.0%
  
  [libx264 @ 0xd910c0] i16 v,h,dc,p: 95%  1%  4%  0%
  
  [libx264 @ 0xd910c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  6%  8% 38%  7%  7%  6% 11%  9%  9%
  
  [libx264 @ 0xd910c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu:  8%  9% 23%  9%  9%  8% 14%  9% 11%
  
  [libx264 @ 0xd910c0] i8c dc,h,v,p: 72% 10%  5% 13%
  
  [libx264 @ 0xd910c0] Weighted P-Frames: Y:50.0% UV:50.0%
  
  [libx264 @ 0xd910c0] ref P L0: 50.0% 50.0%
  
  [libx264 @ 0xd910c0] kb/s:3829.46