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• FFMPEG hangs (sometimes) when trying to take a photo from USB camera ?

  13 mai 2022, par dezman

  I am attempting to write a script that takes a photo every 3 seconds from camera source "1", the -pix_fmt I think is unique to my USB camera.

  


  Here is the script :

  


  #!/bin/bash

set -e

while :
do
  nice_num=$(date +%s)
  
  ffmpeg -ss 00:00:00 -f avfoundation -pix_fmt yuyv422 -r 30.000030 -i "1" -t 1 -frames:v 1 -q:v 2 "image_$nice_num_%03d.jpg"
  
  wait

  sleep 3
done


  


  The issue is half the time it successfully takes the photo, and half the time it just hangs forever echoing this (not useful) :

  


  ffmpeg version 5.0.1 Copyright (c) 2000-2022 the FFmpeg developers
  built with Apple clang version 13.1.6 (clang-1316.0.21.2)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/5.0.1 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox
  libavutil      57. 17.100 / 57. 17.100
  libavcodec     59. 18.100 / 59. 18.100
  libavformat    59. 16.100 / 59. 16.100
  libavdevice    59.  4.100 / 59.  4.100
  libavfilter     8. 24.100 /  8. 24.100
  libswscale      6.  4.100 /  6.  4.100
  libswresample   4.  3.100 /  4.  3.100
  libpostproc    56.  3.100 / 56.  3.100


  


  Then I CTRL-C 3 times and get :

  


  ^C^C^CReceived > 3 system signals, hard exiting


  


  Other methods of "taking a photo every n seconds from bash" are also appreciated.

  


• avfilter/vpp_qsv : fix regression on older api versions (e.g. 1.11)

  7 janvier 2022, par softworkz

  avfilter/vpp_qsv : fix regression on older api versions (e.g. 1.11)
  Commit 8b83dad82512a6948b63408f964463b063ad24c9 introduced a
  
  regression in a way that scaling via vpp_qsv doesn't work any longer
  
  for devices with an MSDK runtime version lower than 1.19. This is true
  
  for older CPUs which are stuck at 1.11.
  
  The commit added checks for the compile-sdk version but it didn't test
  
  for the runtime version.
  Signed-off-by : softworkz <softworkz@hotmail.com>
  
  Signed-off-by : Haihao Xiang <haihao.xiang@intel.com>
  

  • [DH] libavfilter/vf_vpp_qsv.c

• Adjusting webcam settings before shooting a photo (v4l2 and fswebcam)

  18 septembre 2021, par Mikey

  I'm shooting photos with

  


  sudo fswebcam -d /dev/video0 -r 1920x1080 --no-banner /media/networkshare/public/"Temp Photo Holder SolidScape Right"/timelapse_$DATE.jpg


  


  on a Raspberry Pi 3 B+ running a recent version of Raspbian.

  


  The script is controlling a Logitech c920 that has adjustable features like focus, brightness, contrast, etc.

  


  I think the reason the 'manual' settings are not being saved is because I call the v4l2-ctl commands, add a delay, and then use fswebcam to shoot, like so :

  


  #!/bin/bash
DATE=$(date +"%y%m%d%H%M%S")
#sudo v4l2-ctl -d /dev/video0 -c focus_auto=false
#sudo v4l2-ctl -d /dev/video0 -c focus_absolute=35
sudo v4l2-ctl -d /dev/video0 -c brightness=128
sudo v4l2-ctl -d /dev/video0 -c contrast=128
sudo v4l2-ctl -d /dev/video0 -c saturation=128
sudo v4l2-ctl -d /dev/video0 -c gain=15
sudo v4l2-ctl -d /dev/video0 -c sharpness=128
sleep 2

sudo v4l2-ctl -c exposure_auto_priority=1

#fswebcam -d /dev/video0 -r 1920x1080 --no-banner /media/networkshare/public/RasPi/"Temp Photo Holder SS"/timelapse_$DATE.jpg

sudo fswebcam -d /dev/video0 -r 1920x1080 --no-banner /media/networkshare/public/"Temp Photo Holder SolidScape Right"/timelapse_$DATE.jpg

sleep 9

sudo fswebcam -d /dev/video0 -r 1920x1080 --no-banner /media/networkshare/public/"Temp Photo Holder SolidScape Right"/timelapse_$DATE.jpg

sleep 9


  


  How can I take a photo with manual settings appended ? Maybe I need to add commands to fswebcam inline instead of calling v4l2-ctl first ?