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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

• FATE : fix colorbalance fate test failed on x86_32

  1er juillet 2020, par Limin Wang

  FATE : fix colorbalance fate test failed on x86_32
  floating point precision will cause rgb*max generate different value on
  
  x86_32 and x86_64. have pass fate test on x86_32 and x86_64 by using
  
  lrintf to get the nearest integral value for rgb * max before av_clip.
  Reviewed-by :   Paul B Mahol <onemda@gmail.com>
  
  Signed-off-by : Limin Wang <lance.lmwang@gmail.com>
  

  • [DH] libavfilter/vf_colorbalance.c
  • [DH] tests/ref/fate/filter-colorbalance
  • [DH] tests/ref/fate/filter-colorbalance-gbrap
  • [DH] tests/ref/fate/filter-colorbalance-gbrap-16
  • [DH] tests/ref/fate/filter-colorbalance-rgba64

• Problems compiling ffmpeg for iOS

  19 août 2012, par marchinram

  I seen a few posts similar to this one but the problem I'm having is slightly different, I downloaded the ffmpeg source and ran configure like below :

  ./configure --disable-doc --disable-ffmpeg --disable-ffplay --disable-ffserver \ 
  
  --enable-cross-compile --arch=arm --target-os=darwin \ 
  
  --cc=/applications/xcode.app/contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc --as='gas-preprocessor/gas-preprocessor.pl /applications/xcode.app/contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc' \ 
  
  --sysroot=/applications/xcode.app/contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk \ 
  
  --cpu=cortex-a8 --extra-cflags='-arch armv7' --extra-ldflags='-arch armv7 \ 
  
  -isysroot /applications/xcode.app/contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk' --enable-pic

  The configure appears to work right, it ends with this

  License: LGPL version 2.1 or later
  
  Creating config.mak and config.h...
  
  
  
  WARNING: Compiler does not indicate floating-point ABI, guessing soft.

  But when I then run make I get this

  AS  libavcodec/arm/ac3dsp_armv6.o
  
  ./libavutil/arm/asm.S:178:garbage following instruction -- `ldr r4,.Lpicoff\'
  
  ./libavutil/arm/asm.S:179:Unknown pseudo-op: .Lpic
  
  ./libavutil/arm/asm.S:179:Rest of line ignored. 1st junk character valued 92 (\).
  
  ./libavutil/arm/asm.S:181:Unknown pseudo-op: .altmacro
  
  ./libavutil/arm/asm.S:182:Unknown pseudo-op: .noaltmacro
  
  ./libavutil/arm/asm.S:185:Unknown pseudo-op: .Lpic
  
  ./libavutil/arm/asm.S:185:Rest of line ignored. 1st junk character valued 92 (\).
  
  ./libavutil/arm/asm.S:178:garbage following instruction -- `ldr lr,.Lpicoff\'
  
  ./libavutil/arm/asm.S:179:Unknown pseudo-op: .Lpic
  
  ./libavutil/arm/asm.S:179:Rest of line ignored. 1st junk character valued 92 (\).
  
  ./libavutil/arm/asm.S:181:Unknown pseudo-op: .altmacro
  
  ./libavutil/arm/asm.S:182:Unknown pseudo-op: .noaltmacro
  
  ./libavutil/arm/asm.S:185:Unknown pseudo-op: .Lpic
  
  ./libavutil/arm/asm.S:185:Rest of line ignored. 1st junk character valued 92 (\).
  
  make: *** [libavcodec/arm/ac3dsp_armv6.o] Error 1

  Any help would be greatly appreciated