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• DirectShow Capture Source and FFMPEG

  27 janvier 2015, par Juan Ayala

  I have an AJA Capture card. The drivers installed with the card include some DirectShow filter. If I pop the filter into GraphEdit I see this :

  

  and if I run the ffmpeg command

  ffmpeg -f dshow -list_options true -i video="AJA Capture Source"

  I see

  [dshow @ 0034eec0] DirectShow video device options
  
  [dshow @ 0034eec0]  Pin "Video"
  
  [dshow @ 0034eec0]   pixel_format=yuyv422  min s=720x486 fps=27.2604 max s=1024x
  
  486 fps=29.985
  
  ...
  
  [dshow @ 0034eec0]  Pin "Audio 1-2"
  
  [dshow @ 0034eec0]  Pin "Line21"
  
  video=AJA Capture Source: Immediate exit requested

  So I see the Video and Audio pins I need. But when I try to run an ffmpeg command to capture both, I can only figure out how to do the video part. How do I hook in to that audio pin ? It seems all the examples and documentation point to using a separate audio device, and nothing about hooking into the pins. I’m running it out of a batch file for now like this and I use the ^ to break the line

  ffmpeg.exe ^
  
  -y ^
  
  -rtbufsize 100M ^
  
  -f dshow ^
  
  -i video="AJA Capture Source" ^
  
  -t 00:00:10 ^
  
  -aspect 16:9 ^
  
  -c:v libx264 ^
  
  "C:\VCS_AUD_SAMPLE.mp4"

  Again, the command above will get me some beautiful video, but I can’t figure out the audio part. Is this even supported in ffmpeg or am I going to have to modify the ffmpeg dshow code ?

• Video capture by FFMPEG with closed captions data

  9 septembre 2019, par MaximVolobuev

  I’m trying to capture TV broadcasting from Avermedia C027 card using FFMPEG :

  ffmpeg -y -re -rtbufsize 500M -video_size 1920x1080 -framerate 29.97 -f dshow -i video="@device_pnp_\\?\pci#ven_1a0a&dev_6202&subsys_620f1461&rev_01#4&3227f04d&0&00d8#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\{ede957b0-eaa5-4bf4-acf3-6e10cb4836c3}":audio="@device_pnp_\\?\pci#ven_1a0a&dev_6202&subsys_620f1461&rev_01#4&3227f04d&0&00d8#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\{ca465100-deb0-4d59-818f-8c477184adf6}" -c:v h264 -c:a aac -f mpegts test.ts

  Video and audio is OK, but captured video does not contain EIA-608 closed captions data. I tried to add [out0+subcc] flag after video device name, but FFMPEG says that device name is incorrect in this case.

  Video data of Avermedia card undoubtly contain closed captions, because another software installed to the computer can capture video with closed captions.

  Is there any flags to tell to FFMPEG that closed captions should be captured with video ?

• Using GDIgrab in FFmpeg with dshow Audio produces black screen

  16 mars 2016, par Spreadys

  here is my command :

  ffmpeg -f gdigrab -framerate 25 -offset_x 10 -offset_y 10 -show_region 1 -draw_mouse 1 -video_size 1280x720 -i desktop -f dshow -i audio="Microphone (2- ATR USB microphone)" -r 25 -threads 4 -c:v libx264 -pix_fmt yuv422p -preset superfast -tune fastdecode -x264opts keyint=25:min-keyint=1 -crf 4 -c:a aac -profile:a aac_low -async 25 "C:\Users\david\Desktop\%output%.mp4"

  The gdigrab video works great when it is on its own (no audio). The audio works fine when it is on its own (no video). When I join the two commands to capture both together, as soon as I move a window within my capture area, the area goes black.

  In Windows 7, I used to get around this by stopping the desktop composition service prior to capture, (SC stop uxsms), but this is now not possible in Win10.

  I thought it may be something graphics card related.
  My main monitor is on an Nvidia card, with my second running from the onboard Intel. This is setup for Quicksync H264 playback and encoding with my NLE.

  I know that I could use a dshow screen capture driver such as UScreen but am trying to avoid that as I need the capture area to be specified each time from a simple batch.

  Any help appreciated to solve this black area problem- its driving me crazy !
  David