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• lavc/dxv : move tag definitions to common header

  10 février 2024, par Connor Worley

  lavc/dxv : move tag definitions to common header
  Signed-off-by : Connor Worley <connorbworley@gmail.com>
  

  • [DH] libavcodec/dxv.c
  • [DH] libavcodec/dxv.h
  • [DH] libavcodec/dxvenc.c

• Black screen when recording specific screen / window using ffmpeg [closed]

  16 mai, par Mark Brin

  Issue :
I'm trying to capture the specific window using ffmpeg & i've tried these below command for that :

  


  ffmpeg -f gdigrab -framerate 30 -i title="Window Title" -b:v 3M -pix_fmt yuv420p output_FILENAME.webm


  


  And also try changing output format to .mp4

  


  ffmpeg -f gdigrab -framerate 30 -i title="Window Title" -b:v 3M -pix_fmt yuv420p output_FILENAME.mp4


  


  but the output video just shows the black screen with cursor.

  


  What i've tried :

  


  


  • Tried online solutions like Recording Screen with FFmpeg, How to record a specific window using ffmpeg ?, Record specific window using ffmpeg, but none of them worked.

    


  


  • even tried some of the tweaks like removing flags like -pix_fmt yuv420p also tried -f d3d11grab but didn't work.

    


  


  • When i try desktop capture it works completely fine.

    


  


  • I'm using this command to confirm that i'm using correct window title

    


  


  


  Get-Process |
  Where-Object { $_.MainWindowTitle -ne "" } |
  Select-Object -Unique MainWindowTitle


  


  System I'm using :

  


  Windows 11

  


• Overlaying one video on another one and making black pixels or green pixels transparent

  30 décembre 2017, par kostya572

  I found great answer here : https://stackoverflow.com/a/38581696/2337706

  It works only for black pixels. The result is not perfect. I guess if change the overlay background color to other color, e.g. green, red, blue the results would be better. How can I change the other background color ?

  Here is my working code :

  ffmpeg -y \
  
      -i video.webm -i overlay.mov \
  
      -filter_complex " \
  
          [0:v]setpts=PTS-STARTPTS[base]; \
  
          [1:v]crop=iw:0.50*ih,setpts=PTS-STARTPTS+0/TB, \
  
                   format=yuva420p,colorchannelmixer=aa=0.7[overlay]; \
  
       [base][overlay]overlay=x=(W-w)/2:y=0[v]" \
  
   -map "[v]" -map 0:a -c:a copy -c:v libvpx-vp9 -lossless 1 -threads 4 -quality realtime \
  
   -speed 8 -tile-columns 6 -frame-parallel 1 -vsync 2 -shortest output.webm

  The result :
  

  Need result :
  

  Or need result (if impossible first with good quality) :
  

  Thank you, sorry for the frequent questions on ffpmpeg topic.