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Malady
Asked: 2025-03-03 06:54:59 +0800 CST

相机总是黑屏，但 FFPlay 没问题

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相机应用程序曾经与我的 USB 网络摄像头配合使用，但现在如果我过早运行它，它要么卡在等待强制退出或等待提示，要么加载到黑屏的“无法播放相机流”消息中，而使用终端运行ffplay /dev/video0或vlc v4l2:///dev/video0获取视频就可以了。

同时cvlc v4l2:///dev/video0得到：

VLC media player 3.0.20 Vetinari (revision 3.0.20-0-g6f0d0ab126b)
[00005d11a8026f60] dummy interface: using the dummy interface module...
[000078b908048bf0] xcb_window window error: X server failure

这有问题吗？

$ ls -l /dev/video*
crw-rw----+ 1 root video 81, 0 Mar  1 08:03 /dev/video0
crw-rw----+ 1 root video 81, 1 Mar  1 08:03 /dev/video1

相机应用程序的调试信息：

Library Details:

Aperture 0.6.0
GStreamer 1.24.2
Pipewire 1.0.5
Gtk 4.14.2

Cameras:

GENERAL WEBCAM (V4L2) Video/Source: {
    "object.path": (gchararray) "v4l2:/dev/video0",
    "api.v4l2.cap.card": (gchararray) "GENERAL WEBCAM: GENERAL WEBCAM",
    "device.id": (gchararray) "42",
    "clock.quantum-limit": (gchararray) "8192",
    "api.v4l2.path": (gchararray) "/dev/video0",
    "device.devids": (gchararray) "20736",
    "node.pause-on-idle": (gchararray) "false",
    "node.driver": (gchararray) "true",
    "device.product.id": (gchararray) "0x224",
    "api.v4l2.cap.driver": (gchararray) "uvcvideo",
    "api.v4l2.cap.capabilities": (gchararray) "84a00001",
    "api.v4l2.cap.version": (gchararray) "6.8.12",
    "device.api": (gchararray) "v4l2",
    "api.v4l2.cap.device-caps": (gchararray) "04200001",
    "device.vendor.id": (gchararray) "0x1b3",
    "node.name": (gchararray) "v4l2_input.pci-0000_06_00.3-usb-0_4_1.0",
    "node.nick": (gchararray) "GENERAL WEBCAM",
    "priority.session": (gchararray) "1000",
    "client.id": (gchararray) "35",
    "object.id": (gchararray) "45",
    "factory.name": (gchararray) "api.v4l2.source",
    "api.v4l2.cap.bus_info": (gchararray) "usb-0000:06:00.3-4",
    "media.class": (gchararray) "Video/Source",
    "factory.id": (gchararray) "10",
    "node.description": (gchararray) "GENERAL WEBCAM (V4L2)",
    "object.serial": (gchararray) "45",
    "media.role": (gchararray) "Camera",
24.04

1 个回答

  1. Best Answer

    搜索了相机流故障，这使我来到这里了解它在终端上的工作原理。

    终端相机（又名“快照”）失败了，但查找错误消息Could not start camerabin: Element failed to change its state将我发送到此处，这激发了我尝试wireplumber自行运行。

    错误消息PipeWire's libcamera SPA missing or broken.将我发送到此unix 堆栈答案以安装libcamera-ipa和pipewire-libcamera，之后重置解决了我的问题。

    • 1

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