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Craig Howard's questions

Martin Hope
Craig Howard
Asked: 2023-10-21 07:40:21 +0800 CST
  • 6

我有一个 nexigo 高清网络摄像头，可以在我的工作笔记本电脑（运行 Ubuntu）上运行，但在我的台式机（也运行 Ubuntu）上失败。我确信我的桌面上有一些配置错误，但我不知道下一步要检查什么。

我尝试过各种网络浏览器、cheese、qv4l2、obs-studio 和 gst-launch-1.0。这是带有 USB 网络摄像头的标准台式机，因此无需按特殊按键即可启用摄像头，也没有物理开关。这只是在测试之间在我的笔记本电脑和台式机之间拔出/插入。这不太可能相关，但我的台式机使用的是 AMD 显卡。这是在裸机上，没有虚拟化、docker、snap、flatpak 等。至少，我看不到。

以下全部来自我的桌面，网络摄像头无法正常工作。我在视频组：

└──> ls -l /dev/video*
crw-rw----+ 1 root video 81, 0 Oct 20 16:10 /dev/video0
crw-rw----+ 1 root video 81, 1 Oct 20 16:10 /dev/video1
└──> groups | grep -o video
video

发现设备：

└──> v4l2-ctl --list-devices
NexiGo N60 FHD Webcam: NexiGo N (usb-0000:0c:00.3-3.1.2):
        /dev/video0
        /dev/video1
        /dev/media0

这是一个相对标准的uvcvideo设备：

└──> v4l2-dbg -D -d /dev/video0   
Driver info:
        Driver name   : uvcvideo
        Card type     : NexiGo N60 FHD Webcam: NexiGo N
        Bus info      : usb-0000:0c:00.3-3.1.2
        Driver version: 6.2.16
        Capabilities  : 0x84A00001
                Video Capture
                Streaming
                Extended Pix Format
                Device Capabilities

但我无法分配缓冲区。我认为问题与其他程序相同，但我不能总是得到好的日志。

└──> GST_DEBUG="v4l2*:3" gst-launch-1.0 v4l2src device=/dev/video0 ! videoscale ! videoconvert ! autovideosink
Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
0:00:00.079505628 31240 0x564e88fc6800 ERROR         v4l2bufferpool gstv4l2bufferpool.c:706:gst_v4l2_buffer_pool_streamon:<v4l2src0:pool0:src> error with STREAMON 5 (Input/output error)
0:00:00.079591570 31240 0x564e88fc6800 WARN                 v4l2src gstv4l2src.c:759:gst_v4l2src_decide_allocation:<v4l2src0> error: Failed to allocate required memory.
0:00:00.079597662 31240 0x564e88fc6800 WARN                 v4l2src gstv4l2src.c:759:gst_v4l2src_decide_allocation:<v4l2src0> error: Buffer pool activation failed
ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Failed to allocate required memory.
Additional debug info:
../sys/v4l2/gstv4l2src.c(759): gst_v4l2src_decide_allocation (): /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
Buffer pool activation failed
ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Internal data stream error.
Additional debug info:
../libs/gst/base/gstbasesrc.c(3127): gst_base_src_loop (): /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
streaming stopped, reason not-negotiated (-4)
Execution ended after 0:00:00.059204336
Setting pipeline to NULL ...
Freeing pipeline ...

看看上面的 strace，我正在EIO从ioctlfor得到VIDIOC_STREAMON。

34265 ioctl(7, VIDIOC_REQBUFS, {type=V4L2_BUF_TYPE_VIDEO_CAPTURE, memory=V4L2_MEMORY_MMAP, count=2 => 2}) = 0
34265 ioctl(7, VIDIOC_QUERYBUF, {type=V4L2_BUF_TYPE_VIDEO_CAPTURE, index=0, memory=V4L2_MEMORY_MMAP, m.offset=0, length=1843200, bytesused=0, flags=V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC|V4L2_BUF_FLAG_TSTAMP_SRC_SOE, ...}) = 0
34265 ioctl(7, VIDIOC_QUERYBUF, {type=V4L2_BUF_TYPE_VIDEO_CAPTURE, index=1, memory=V4L2_MEMORY_MMAP, m.offset=0x1c2000, length=1843200, bytesused=0, flags=V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC|V4L2_BUF_FLAG_TSTAMP_SRC_SOE, ...}) = 0
34265 ioctl(7, VIDIOC_EXPBUF, 0x7f0445e3da10) = 0
34265 futex(0x7f04486e10a8, FUTEX_WAKE_PRIVATE, 2147483647) = 0
34265 ioctl(7, VIDIOC_QBUF, {type=V4L2_BUF_TYPE_VIDEO_CAPTURE, index=0, memory=V4L2_MEMORY_MMAP, m.offset=0, length=1843200, bytesused=0, flags=V4L2_BUF_FLAG_MAPPED|V4L2_BUF_FLAG_QUEUED|V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC|V4L2_BUF_FLAG_TSTAMP_SRC_SOE, ...}) = 0
34265 futex(0x7f043800c628, FUTEX_WAKE_PRIVATE, 1) = 0
34265 ioctl(7, VIDIOC_EXPBUF, 0x7f0445e3da10) = 0
34265 ioctl(7, VIDIOC_QBUF, {type=V4L2_BUF_TYPE_VIDEO_CAPTURE, index=1, memory=V4L2_MEMORY_MMAP, m.offset=0x1c2000, length=1843200, bytesused=0, flags=V4L2_BUF_FLAG_MAPPED|V4L2_BUF_FLAG_QUEUED|V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC|V4L2_BUF_FLAG_TSTAMP_SRC_SOE, ...}) = 0
34265 futex(0x7f043800c628, FUTEX_WAKE_PRIVATE, 1) = 0
34265 ioctl(13, VIDIOC_STREAMON, [V4L2_BUF_TYPE_VIDEO_CAPTURE]) = -1 EIO (Input/output error)

这就是我陷入困境的地方。接下来我应该看什么？

谢谢。

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