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• How can I use both vaapi acceleration and video overlays with ffmpeg

  10 novembre 2019, par nrdxp

  I am fairly new to ffmpeg and I am trying to capture both my webcam and my screen, all using vaapi acceleration (without it, its too slow). I want to overlay the webcam in the bottom right corner using ffmpeg. I need to use kmsgrab, so I can record a Wayland session on Linux.

  What I am doing to work around this is simply open the webcam in a window using the sdl backend, and then call another instance off ffmpeg to record the screen. This isn’t ideal however, since the window with the webcam gets covered up by other windows on fullscreen or when workspace switching. I would much rather encode the webcam on top of the screencast so it is always visible, no matter what I am doing.

  Here is the workaround script I am using right now :

  #!/usr/bin/env zsh
  
  
  
  # record webcam and open it in sdl window
  
  ffmpeg -v quiet -hide_banner -re -video_size 640X480 -hwaccel vaapi -vaapi_device /dev/dri/renderD128 -i /dev/video0 -vf 'format=nv12,hwupload' -c:v hevc_vaapi -f hevc -threads $(nproc) - | ffmpeg -v quiet -i - -f sdl2 - &
  
  
  
  # wait for webcam window to open
  
  until swaymsg -t get_tree | grep 'pipe:' &>/dev/null; do
  
    sleep 0.5
  
  done
  
  
  
  # position webcam in the bottom right corner of screen using sway
  
  swaymsg floating enable
  
  swaymsg resize set width 320 height 240
  
  swaymsg move position 1580 795
  
  swaymsg focus tiling
  
  
  
  #screencast
  
  ffmpeg -format bgra -framerate 60 -f kmsgrab -thread_queue_size 1024 -i - \
  
    -f alsa -ac 2 -thread_queue_size 1024 -i hw:0 \
  
    -vf 'hwmap=derive_device=vaapi,scale_vaapi=w=1920:h=1080:format=nv12' \
  
    -c:v h264_vaapi -g 120 -b:v 3M -maxrate 3M -pix_fmt vaapi_vld -c:a aac -ab 96k -threads $(nproc) \
  
    output.mkv
  
  
  
  kill %1

  So far, I’ve tried adding the webcam as a second input to the screencast and using :

  -filter_complex '[1] scale=w=320:h=240,hwupload,format=nv12 [tmp]; \
  
  [0][tmp] overlay=x=1580:y=795,hwmap=derive_device=vaapi,scale_vaapi=w=1920:h=1080:format=nv12' \

  But I get the error :

  Impossible to convert between the formats supported by the filter 'Parsed_hwupload_1' and the filter 'auto_scaler_0'
  
  Error reinitializing filters!
  
  Failed to inject frame into filter network: Function not implemented

• ffmpeg : zoom over bottom (right/left) corners

  22 août 2018, par Vinod Mankare

  I need to create a video with zoom effect over an image to highlight bottom right/left corner with the help of ffmpeg.

  I am trying with the following command :

  ffmpeg -loop 1 -i image.png -filter_complex "zoompan=z=’zoom+0.002’:x=’trunc(380)’:y=’trunc(287)’:d=100" -ss 0 -i audio.mp3 -c:v libx264 -crf 0 -c:a aac -strict experimental -b:v 6M -b:a 1080k -r 25 -bufsize 1080k -shortest -s 1920x1080 -aspect 16:9 -y output.mp4 2>&1

  Its working for the top (right/left) and centre element but not getting proper zoom effect for bottom corners for the same image. Please suggest what am I doing wrong, or is there any other best option to do the same ?

• FFMPEG How to add gif water mark to mp4 video with loop,scale,overlay positionig

  12 décembre 2020, par Sreehari Kodavalam

  This is my code

  


  ffmpeg -i video.mp4  -i anim.gif -filter_complex "[1:v] loop=-1,scale=300:-1 [ol], [0:v] [ol] overlay=W-w:H-h-10" -codec:a copy -y out.mp4


  


  But am unable to put it in loop the gif according to video length

  


  Am also trying to scale the gif width to 30% of th main video width
Gif positioing working here am able to position the gif at the bootom right corner
But i also need to scale it according to main video width