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• FFmpeg/FFplay directshow and blackmagic

  21 janvier 2016, par max246

  I got a BlackMagic intensity pro 4k capturing card, which is working fine with the express tool, I can see the live feed and record, but after I tried different stuff from what I found online to make ffplay/ffmpeg working, I ended up to have just a black screen.

  I have checked if all the versions of my ffmpeg files were eanable-decklinnk, I have compiled the latest one with the latest version of the api, but still I get a black screen instead of the actually feed.

  ffmpeg -list_devices true -f dshow -i dummy
  
  ffmpeg version N-77245-g7209c94 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 5.2.0 (Rev4, Built by MSYS2 project)
  
    configuration:  --enable-avisynth --enable-libbluray --enable-libcaca --enable -libass --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame
  
   --enable-libschroedinger --enable-libsoxr --enable-libtwolame --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libopus --enable-libtesseract --
  
  enable-libdcadec --enable-libbs2b --enable-libmfx --enable-libfreetype --enable-fontconfig --enable-libfribidi --enable-opengl --enable-libvpx --enable-libkvaza
  
  ar --enable-libwebp --enable-decklink --enable-libgme --disable-w32threads --enable-opencl --enable-libzimg --enable-openssl --disable-debug
  
    libavutil      55. 10.100 / 55. 10.100
  
    libavcodec     57. 17.100 / 57. 17.100
  
    libavformat    57. 20.100 / 57. 20.100
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 21.100 /  6. 21.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
  [dshow @ 0000000ba36b6480] DirectShow video devices (some may be both video and audio devices)
  
  [dshow @ 0000000ba36b6480]  "Blackmagic WDM Capture"
  
  [dshow @ 0000000ba36b6480]     Alternative name "@device_pnp_\\?\decklink#avstream#5&2550cef9&0&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\decklinkcapture1"
  
  [dshow @ 0000000ba36b6480]  "Decklink Video Capture"
  
  [dshow @ 0000000ba36b6480]     Alternative name "@device_sw_{860BB310-5D01-11D0-BD3B-00A0C911CE86}\{44A8B5C7-13B6-4211-BD40-35B629D9E6DF}"
  
  [dshow @ 0000000ba36b6480] DirectShow audio devices
  
  [dshow @ 0000000ba36b6480]  "Wej?øcie liniowe (Blackmagic Audio)"
  
  [dshow @ 0000000ba36b6480]     Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{977E2DB6-B17C-4343-9018-652924C20A8C}"
  
  [dshow @ 0000000ba36b6480]  "Decklink Audio Capture"
  
  [dshow @ 0000000ba36b6480]     Alternative name "@device_sw_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\{AAA22F7E-5AA0-49D9-8C8D-B52B1AA92EB7}"
  
  dummy: Immediate exit requested

  The result above tells me that ffmpeg can see the card and I am able to open a communication, I have checked one post where it says you need to specific which input type is showing, otherwise it will never work, and I did that, but still no luck.

  By running the command line above, I can only see a black screen but not actually errors.

  I am running Windows 8.1 64bit.

  ffplay  -pixel_format uyvy422 -framerate 25 -f dshow -i video="Decklink Video Capture"  -format x264
  
  ffplay version N-77245-g7209c94 Copyright (c) 2003-2015 the FFmpeg developers
  
    built with gcc 5.2.0 (Rev4, Built by MSYS2 project)
  
    configuration:  --enable-avisynth --enable-libbluray --enable-libcaca --enable-libass --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame
  
   --enable-libschroedinger --enable-libsoxr --enable-libtwolame --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libopus --enable-libtesseract --
  
  enable-libdcadec --enable-libbs2b --enable-libmfx --enable-libfreetype --enable-fontconfig --enable-libfribidi --enable-opengl --enable-libvpx --enable-libkvaza
  
  ar --enable-libwebp --enable-decklink --enable-libgme --disable-w32threads --enable-opencl --enable-libzimg --enable-openssl --disable-debug
  
    libavutil      55. 10.100 / 55. 10.100
  
    libavcodec     57. 17.100 / 57. 17.100
  
    libavformat    57. 20.100 / 57. 20.100
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 21.100 /  6. 21.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
  Input #0, dshow, from 'video=Decklink Video Capture':    0B f=0/0
  
    Duration: N/A, start: 0.138773, bitrate: N/A
  
      Stream #0:0: Video: rawvideo (UYVY / 0x59565955), uyvy422, 720x576, 25 tbr,
  
  10000k tbn, 25 tbc
  
     1.51 M-V: -0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0

• Stack Videos Horizontally

  7 juin 2020, par vourla

  I need to merge two videos side by side. I use ffmpeg hstack filter. I tested that filter in two different computer. One of the computers includes 2 core cpu and external gpu, the other computer includes 8 core cpu no gpu. I monitored the performances of merging two videos on those computers. Performance of two core computer is better than 8 core one. As I see there no gpu usage. How can it be possible ?

  



  Also, I'm wondering is there any other alternative way with better timing performance to merge two videos ?

  



  My command :

  



  ffmpeg -i xx.mp4 -i yy.mp4 -filter_complex hstack zz.mp4

  


• FFMPEG blur specific time ranges in a video too slow

  11 juillet 2022, par user3529381

  We are trying to blur specific sections of a video, below command works fine. Only concern is the rate of processing is too slow and takes too much of time. Any clue how to make it fast or any other alternative solution in python to do it fast. Please don't provide solution using cv2 as that doesn't support h264 codec and required output is in h264 codec.

  


  ffmpeg -i input.mp4 -vf "boxblur=30:enable='between(t,25,30)',boxblur=30:enable='between(t,35,40)'" -codec:a copy output_blur.mp4