无法在 OpenCV 中录制高分辨率视频

如何解决无法在 OpenCV 中录制高分辨率视频

我有一个新的 USB 摄像头。这是相机信息

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我正在尝试使用 VIdioC_ENUM_FMT Index : 0 Type : Video Capture Pixel Format: 'MJPG' (compressed) Name : Motion-JPEG Size: discrete 1920x1080 Interval: discrete 0.033s (30.000 fps) Size: discrete 1280x720 Interval: discrete 0.033s (30.000 fps) Size: discrete 800x480 Interval: discrete 0.033s (30.000 fps) Size: discrete 640x480 Interval: discrete 0.033s (30.000 fps) Size: discrete 640x360 Interval: discrete 0.033s (30.000 fps) Size: discrete 320x240 Interval: discrete 0.033s (30.000 fps) Size: discrete 176x144 Interval: discrete 0.033s (30.000 fps) Size: discrete 800x600 Interval: discrete 0.033s (30.000 fps) Size: discrete 1920x1080 Interval: discrete 0.033s (30.000 fps) Index : 1 Type : Video Capture Pixel Format: 'YUYV' Name : YUYV 4:2:2 Size: discrete 640x480 Interval: discrete 0.033s (30.000 fps) Size: discrete 640x360 Interval: discrete 0.033s (30.000 fps) Size: discrete 320x240 Interval: discrete 0.033s (30.000 fps) Size: discrete 176x144 Interval: discrete 0.033s (30.000 fps) Size: discrete 640x480 Interval: discrete 0.033s (30.000 fps) 录制视频，但是 MJPG 在录制时使用 opencv 和 YUYV 和 5 640x480这个设置。我可以手动设置 30 fps，但是当我增加宽度或高度时，我无法录制视频...

fps

我的 cam = cv2.VideoCapture(0,cv2.CAP_V4L2) width = int(cam.get(cv2.CAP_PROP_FRAME_WIDTH)) #max height = int(cam.get(cv2.CAP_PROP_FRAME_HEIGHT)) fps = cv2.CAP_PROP_FPS cam.set(3,width) cam.set(4,height) fourcc = cv2.VideoWriter_fourcc(*'MPEG') cv2.VideoWriter(file_name,fourcc,fps,(width,height)) ('4.5.1') 是用这个标志 (aarch linux) 从源代码编译的

opencv

顺便说一句。

cmake -D CMAKE_BUILD_TYPE=RELEASE \
    -D WITH_CUDA=ON \
    -D CUDA_ARCH_PTX="" \
    -D CUDA_ARCH_BIN="5.3,6.2,7.2" \
    -D WITH_CUBLAS=ON \
    -D WITH_LIBV4L=ON \
    -D BUILD_opencv_python3=ON \
    -D BUILD_opencv_python2=OFF \
    -D BUILD_opencv_java=OFF \
    -D WITH_GSTREAMER=ON \
    -D WITH_GTK=ON \
    -D BUILD_TESTS=OFF \
    -D BUILD_PERF_TESTS=OFF \
    -D BUILD_EXAMPLES=OFF \
    -D OPENCV_ENABLE_NONFREE=ON \
    -D OPENCV_EXTRA_MODULES_PATH=/home/`whoami`/opencv_contrib/modules ..

对我不起作用。而且 v4l2-ctl --set-fmt-video=width=1920,height=1080,pixelformat=MJPG 不会记录大于 640x480...

请问问题出在哪里？