WhyCan Forum(哇酷开发者社区)

`# ffmpeg -f v4l2 -input_format rawvideo -video_size 320x240 -i /dev/video0 -fram
es 1 image.jpg
ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 6.4.0 (Buildroot 2018.02.1)
  configuration: --enable-cross-compile --cross-prefix=/opt/buildroot-2018.02.1/output/host/bin/arm-buildroot-linux-gnueabihf- --sysroot=/opt/buildroot-2018.02.1/output/host/arm-buildroot-linux-gnueabihf/sysroot --host-cc='/opt/buildroot-2018.02.1/output/host/bin/ccache /usr/bin/gcc' --arch=arm --target-os=linux --disable-stripping --pkg-config=/opt/buildroot-2018.02.1/output/host/bin/pkg-config --disable-static --enable-shared --prefix=/usr --enable-avfilter --disable-version3 --enable-logging --enable-optimizations --disable-extra-warnings --enable-avdevice --enable-avcodec --enable-avformat --enable-network --disable-gray --enable-swscale-alpha --disable-small --enable-dct --enable-fft --enable-mdct --enable-rdft --disable-crystalhd --disable-dxva2 --enable-runtime-cpudetect --disable-hardcoded-tables --disable-mipsdsp --disable-mipsdspr2 --disable-msa --enable-hwaccels --disable-cuda --disable-cuvid --disable-nvenc --disable-avisynth --disable-frei0r --disable-libopencore-amrnb --disable-libopencore-amrwb --disable-libcdio --disable-libdc1394 --disable-libgsm --disable-libilbc --disable-libvo-amrwbenc --disable-symver --disable-doc --enable-gpl --enable-nonfree --enable-ffmpeg --disable-ffplay --disable-ffserver --disable-avresample --disable-ffprobe --disable-postproc --disable-swscale --enable-indevs --enable-alsa --enable-outdevs --enable-pthreads --enable-zlib --disable-bzlib --disable-libfdk-aac --enable-gnutls --disable-openssl --disable-libopenh264 --disable-vaapi --disable-vdpau --disable-mmal --disable-omx --disable-omx-rpi --disable-libopencv --disable-libopus --disable-libvpx --disable-libass --disable-libbluray --disable-librtmp --disable-libmp3lame --disable-libmodplug --disable-libspeex --disable-libtheora --disable-libwavpack --disable-iconv --enable-libfreetype --disable-fontconfig --disable-libopenjpeg --disable-libx264 --disable-libx265 --disable-x86asm --disable-mmx --disable-sse --disable-sse2 --disable-sse3 --disable-ssse3 --disable-sse4 --disable-sse42 --disable-avx --disable-avx2 --enable-armv6 --enable-vfp --enable-neon --disable-altivec --extra-libs=-latomic --enable-pic --cpu=cortex-a7
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libswresample   2.  9.100 /  2.  9.100
[video4linux2,v4l2 @ 0x64050] ioctl(VIDIOC_G_PARM): Inappropriate ioctl for device
[video4linux2,v4l2 @ 0x64050] Time per frame unknown
[video4linux2,v4l2 @ 0x64050] ioctl(VIDIOC_STREAMON): Invalid argument
/dev/video0: Invalid argument

# v4l2-ctl --list-devices
sun6i-csi (platform:csi):
        /dev/video0

# v4l2-ctl -d /dev/video0 --all
Driver Info (not using libv4l2):
        Driver name   : sun6i-video
        Card type     : sun6i-csi
        Bus info      : platform:csi
        Driver version: 5.2.0
        Capabilities  : 0x84200001
                Video Capture
                Streaming
                Extended Pix Format
                Device Capabilities
        Device Caps   : 0x04200001
                Video Capture
                Streaming
                Extended Pix Format
Priority: 2
Video input : 0 (camera: ok)
Format Video Capture:
        Width/Height      : 320/240
        Pixel Format      : 'YU12'
        Field             : None
        Bytes per Line    : 480
        Size Image        : 115200
        Colorspace        : Raw
        Transfer Function : Default (maps to None)
        YCbCr/HSV Encoding: Default (maps to ITU-R 601)
        Quantization      : Default (maps to Limited Range)
        Flags             :
#