Web kameramla fotoğraf çekmek için ffmpeg'i nasıl kullanırım?

ffmpegUSB web kameram tarafından çekilen görüntüleri Ubuntu 11.10 cihazımda saklamak için kullanmak istiyorum . lsusbçıktılar:

Bus 002 Device 003: ID 0c45:6028 Microdia Typhoon Easycam USB 330K (older)

Kamera peynir kullanarak iyi çalışıyor, ancak komut dosyası oluşturmak için komut satırı araçlarını kullanmak istiyorum, ancak denerseniz:

ffmpeg -i /dev/v4l/by-id/usb-0c45_USB_camera-video-index0 image.jpg

Çıktı:

user@box:~$ sudo ffmpeg -i /dev/v4l/by-id/usb-0c45_USB_camera-video-index0 image.jpg
[sudo] password for user: 
ffmpeg version 0.7.3-4:0.7.3-0ubuntu0.11.10.1, Copyright (c) 2000-2011 the Libav developers
  built on Jan  4 2012 16:21:50 with gcc 4.6.1
  configuration: --extra-version='4:0.7.3-0ubuntu0.11.10.1' --arch=i386 --prefix=/usr --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --enable-shared --disable-static
  WARNING: library configuration mismatch
  avutil      configuration: --extra-version='4:0.7.3-0ubuntu0.11.10.1' --arch=i386 --prefix=/usr --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
  avcodec     configuration: --extra-version='4:0.7.3-0ubuntu0.11.10.1' --arch=i386 --prefix=/usr --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
  avformat    configuration: --extra-version='4:0.7.3-0ubuntu0.11.10.1' --arch=i386 --prefix=/usr --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
  avdevice    configuration: --extra-version='4:0.7.3-0ubuntu0.11.10.1' --arch=i386 --prefix=/usr --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
  avfilter    configuration: --extra-version='4:0.7.3-0ubuntu0.11.10.1' --arch=i386 --prefix=/usr --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
  swscale     configuration: --extra-version='4:0.7.3-0ubuntu0.11.10.1' --arch=i386 --prefix=/usr --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
  postproc    configuration: --extra-version='4:0.7.3-0ubuntu0.11.10.1' --arch=i386 --prefix=/usr --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
  libavutil    51.  7. 0 / 51.  7. 0
  libavcodec   53.  6. 0 / 53.  6. 0
  libavformat  53.  3. 0 / 53.  3. 0
  libavdevice  53.  0. 0 / 53.  0. 0
  libavfilter   2.  4. 0 /  2.  4. 0
  libswscale    2.  0. 0 /  2.  0. 0
  libpostproc  52.  0. 0 / 52.  0. 0
/dev/v4l/by-id/usb-0c45_USB_camera-video-index0: Invalid data found when processing input

Bu işi nasıl yapabilirim?

İstediğini al:

ffmpeg

ffmpeg -f video4linux2 -i /dev/v4l/by-id/usb-0c45_USB_camera-video-index0 -vframes 1 test.jpeg

İki kare almayı ve ikinci kareyi kullanmayı tercih edin:

ffmpeg -f video4linux2 -i /dev/v4l/by-id/usb-0c45_USB_camera-video-index0 -vframes 2 test%3d.jpeg

fswebcam

Bu çok güzel bir program, bir gecikme seçeneği var:

fswebcam -r 640x480 --jpeg 85 -D 1 shot.jpg

mplayer'dan

mplayer tv:// -tv driver=v4l2:device=/dev/video0:width=1600:height=1200:outfmt=rgb24 -frames 3 -vo jpeg

PS: USB web kameranız yanıt vermiyorsa veya "yeşilimsi" fotoğraflar çekiyorsa, fişini çekin ve tekrar takın. Mine ffmpeg ile "Sürücü şasi başına zamanı 32767/1'den 2/5'e değiştirdi" konumunda sıkıştı

Aslında bu benimle çalışıyor ama sadece 3. resim yeşil değil.

mplayer tv:// -tv driver=v4l2:device=/dev/video0:width=1600:height=1200:outfmt=rgb24 -frames 3 -vo jpeg

1. ve 2. sadece yeşil. Denediğim küçük bir deneme yanılma

mplayer tv:// -tv driver=v4l2:device=/dev/video0:width=640:height=480:outfmt=rgb24 -frames 5 -vo png

Sonuç 1. ve 2. dosyalar yeşildir ancak 3.-5. rgb ve düzgün alınır.