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• Using ffmpeg for capturing (and recording) audio and video from decklink card using Windows 7 [closed]

  30 septembre 2015, par user3540580

  Im new with ffmpeg. I am trying to capture the video + audio from Decklink capture device. However I had some problems, I don’t know which stream using for my current video + audio source that connected to the decklink card’s SDI port. Could someone tell me how to find out the streaming information.

  Here is my information :

  ffmpeg -list_devices true -f dshow -i dummy

  C:\Users\Streaming>ffmpeg -list_devices true -f dshow -i dummy ffmpeg version N-52941-g13cb6ed Copyright (c) 2000-2013 the FFmpeg developers built on May 9 2013 17:24:42 with gcc 4.7.3 (GCC) configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp e --enable-libgsm --enable-libilbc --enable-libmp3lame --enable-libopencore-amrn b --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libr tmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheo ra --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-li bvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --ena ble-zlib libavutil 52. 30.100 / 52. 30.100 libavcodec 55. 7.100 / 55. 7.100 libavformat 55. 4.101 / 55. 4.101 libavdevice 55. 0.100 / 55. 0.100 libavfilter 3. 63.101 / 3. 63.101 libswscale 2. 3.100 / 2. 3.100 libswresample 0. 17.102 / 0. 17.102 libpostproc 52. 3.100 / 52. 3.100 [dshow @ 0000000000306d00] DirectShow video devices [dshow @ 0000000000306d00] "Blackmagic WDM Capture" [dshow @ 0000000000306d00] "Decklink Video Capture" [dshow @ 0000000000306d00] DirectShow audio devices [dshow @ 0000000000306d00] "Line In (High Definition Audio " [dshow @ 0000000000306d00] "Decklink Audio Capture" [dshow @ 0000000000306d00] "Microphone (Total Recorder WDM " dummy: Immediate exit requested

  ffmpeg -list_options true -f dshow -i video="Decklink Video Capture"

  C:\Users\Streaming>ffmpeg -list_options true -f dshow -i video="Decklink Video C apture" ffmpeg version N-52941-g13cb6ed Copyright (c) 2000-2013 the FFmpeg developers built on May 9 2013 17:24:42 with gcc 4.7.3 (GCC) configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp e --enable-libgsm --enable-libilbc --enable-libmp3lame --enable-libopencore-amrn b --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libr tmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheo ra --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-li bvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --ena ble-zlib libavutil 52. 30.100 / 52. 30.100 libavcodec 55. 7.100 / 55. 7.100 libavformat 55. 4.101 / 55. 4.101 libavdevice 55. 0.100 / 55. 0.100 libavfilter 3. 63.101 / 3. 63.101 libswscale 2. 3.100 / 2. 3.100 libswresample 0. 17.102 / 0. 17.102 libpostproc 52. 3.100 / 52. 3.100 [dshow @ 00000000002fa080] DirectShow video device options [dshow @ 00000000002fa080] Pin "Capture" [dshow @ 00000000002fa080]
  
  pixel_format=uyvy422 min s=720x486 fps=29.97 max s =720x486 fps=29.97 [dshow @ 00000000002fa080] pixel_format=uyvy422 min s=720x486 fps=23.976 max s=720x486 fps=23.976 [dshow @ 00000000002fa080] pixel_format=uyvy422 min s=720x576 fps=25 max s=72 0x576 fps=25 [dshow @ 00000000002fa080] pixel_format=uyvy422 min s=1920x1080 fps=23.976 ma x s=1920x1080 fps=23.976 [dshow @ 00000000002fa080] pixel_format=uyvy422 min s=1920x1080 fps=24 max s= 1920x1080 fps=24 [dshow @ 00000000002fa080] pixel_format=uyvy422 min s=1920x1080 fps=25 max s= 1920x1080 fps=25 [dshow @ 00000000002fa080] pixel_format=uyvy422 min s=1920x1080 fps=29.97 max s=1920x1080 fps=29.97 [dshow @ 00000000002fa080]
  
  pixel_format=uyvy422 min s=1920x1080 fps=30 max s= 1920x1080 fps=30 [dshow @ 00000000002fa080] pixel_format=uyvy422 min s=1280x720 fps=50 max s=1 280x720 fps=50 [dshow @ 00000000002fa080]
  
  pixel_format=uyvy422 min s=1280x720 fps=59.9402 ma x s=1280x720 fps=59.9402 [dshow @ 00000000002fa080] pixel_format=uyvy422 min s=1280x720 fps=60.0002 ma x s=1280x720 fps=60.0002 [dshow @ 00000000002fa080] vcodec=v210 min s=720x486 fps=29.97 max s=720x486 fps=29.97 [dshow @ 00000000002fa080] vcodec=v210 min s=720x486 fps=23.976 max s=720x486 fps=23.976 [dshow @ 00000000002fa080]
  
  vcodec=v210 min s=720x576 fps=25 max s=720x576 fps =25 [dshow @ 00000000002fa080] vcodec=v210 min s=1920x1080 fps=23.976 max s=1920x 1080 fps=23.976 [dshow @ 00000000002fa080]
  
  vcodec=v210 min s=1920x1080 fps=24 max s=1920x1080 fps=24 [dshow @ 00000000002fa080] vcodec=v210 min s=1920x1080 fps=25 max s=1920x1080 fps=25 [dshow @ 00000000002fa080] vcodec=v210 min s=1920x1080 fps=29.97 max s=1920x1 080 fps=29.97 [dshow @ 00000000002fa080] vcodec=v210 min s=1920x1080 fps=30 max s=1920x1080 fps=30 [dshow @ 00000000002fa080] vcodec=v210 min s=1280x720 fps=50 max s=1280x720 f ps=50 [dshow @ 00000000002fa080]
  
  vcodec=v210 min s=1280x720 fps=59.9402 max s=1280x 720 fps=59.9402 [dshow @ 00000000002fa080] vcodec=v210 min s=1280x720 fps=60.0002 max s=1280x 720 fps=60.0002 video=Decklink Video Capture: Immediate exit requested

• VLC commandline video croping in windows

  22 avril 2016, par Hasan

  I am trying to crop a video using VLC command line coding. I used the following code in windows cmd :
  vlc C:\Users\Masud\above_marathon_250.mp4 --crop=480x500+290+720 C:\Users\Masud\out.mp4
  But i got the following error :
  

  File reading failed:
VLC could not open the file "C:\Users\Masud\out.mp4" (Bad file descriptor).
Your input can't be opened:
VLC is unable to open the MRL 'file:///C:/Users/Masud/out.mp4'. Check the log for details.

  Can anyone help me to write the accurate command for cropping video ?

• Windows : How to build X264.lib instead of .dll

  25 juin 2015, par user1884325

  I downloaded the X264 source and installed mingw.

  Step 1 :

  Executed this in the MINGW bash :

  ./configure —disable-cli —enable-shared —enable-win32thread -
   extra-ldflags=-Wl,—output-def=libx264.def

  and then ’make’

  Step 2 :

  Renamed the libx264-142.dll to libx264.dll and Opened up VS2012 Command Prompt and executed this :

  LIB /DEF:libx264.def

  which gave me libx264.lib and object libx264.exp

  Step 3 :

  Included the lib file in a VS2012 project which uses the X264 API.

  Problem :

  When I start the project I get the following error message :

  "The program can’t start because libx264.dll is missing from your computer"

  Question :

  Why is it looking for the dll when I’m linking the static library in ?

  How do I resolve this ? I would like to build a static X264 library which I can link in with my project.

  EDIT :

  I just had to put the dll in the same directory as the project executable.

  However - My question still stands : How do I build a static x264 library ? So I don’t need the dll ?