我有一个 HikVision MV-CA050-20UC USB相机（USB 3.0）。我想使用 gstreamer 从 Ubuntu 的 Nvidia Jetson Nano 上捕获视频。安装驱动程序后，import numpy as np
import matplotlib.pyplot as plt
vegetables = ["cucumber", "tomato", "lettuce", "asparagus",
"potato", "wheat", "barley"]
farmers = ["Farmer Joe", "Upland Bros.", "Smith Gardening",
"Agrifun", "Organiculture", "BioGoods Ltd.", "Cornylee Corp."]
farmers_to_vegetables = dict(zip(farmers, vegetables))
harvest = np.array([[0.8, 2.4, 2.5, 3.9, 0.0, 4.0, 0.0],
[2.4, 0.0, 4.0, 1.0, 2.7, 0.0, 0.0],
[1.1, 2.4, 0.8, 4.3, 1.9, 4.4, 0.0],
[0.6, 0.0, 0.3, 0.0, 3.1, 0.0, 0.0],
[0.7, 1.7, 0.6, 2.6, 2.2, 6.2, 0.0],
[1.3, 1.2, 0.0, 0.0, 0.0, 3.2, 5.1],
[0.1, 2.0, 0.0, 1.4, 0.0, 1.9, 6.3]])
fig, ax = plt.subplots()
im = ax.imshow(harvest)
# We want to show all xticks...
ax.set_xticks(np.arange(len(farmers)))
# ... and label them with the respective list entries
ax.set_xticklabels(farmers)
# Rotate the tick labels and set their alignment.
plt.setp(ax.get_xticklabels(), rotation=45, ha="right",
rotation_mode="anchor")
ax2 = fig.add_subplot(111, label="secondary")
ax2.set_aspect("equal")
ax2.set_xlim(ax.get_xlim())
ax2.set_ylim(ax.get_ylim())
ax2.tick_params(left=False, labelleft=False, bottom=False, labelbottom=False,
top=True, labeltop=True)
ax2.set_facecolor("none")
for _, spine in ax2.spines.items():
spine.set_visible(False)
ax2.set_xticks(ax.get_xticks())
ax2.set_xticklabels([farmers_to_vegetables[x.get_text()] for x in ax.get_xticklabels()])
plt.setp(ax2.get_xticklabels(), rotation=45, ha="left",
rotation_mode="anchor")
fig.tight_layout()
plt.show()
会在连接相机后显示（在断开相机连接后它也会消失）。
/dev/video0
或使用此命令
gst-launch-1.0 v4l2src device="/dev/video0" name=e ! 'video/x-raw, width=640, height=480' ! videoconvert ! 'video/x-raw, width=640, height=480, format=(string)YUY2' ! xvimagesink
它显示没有任何视频的此消息：
gst-launch-1.0 -v v4l2src device=/dev/video0 ! video/x-raw,framerate=30/1,width=1280,height=720 ! xvimagesink我确定已正确安装 v4l2 。但是它无法检测到插入的USB摄像机。
Setting pipeline to PAUSED ...
ERROR: Pipeline doesnt want to pause.
ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Error getting capabilities for device /dev/video0: It isnt a v4l2 driver. Check if it is a v4l1 driver.
Additional debug info:
v4l2_calls.c(94): gst_v4l2_get_capabilities (): /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
system error: No such file or directory
Setting pipeline to NULL ...
Freeing pipeline ...
或对于1050Ti系统（另一个系统）的此结果：
v4l2-ctl --all
VIDIOC_QUERYCAP: failed: No such file or directory
/dev/video0: not a v4l2 node
也通过运行Failed to query video capabilities: No such file or directory
libv4l2: error getting capabilities: No such file or directory
VIDIOC_QUERYCAP: failed: No such file or directory
/dev/video0: not a v4l2 node
我收到相同的消息。
Gstreamer版本
v4l2-ctl -d /dev/video0 --list-formats-ext我该如何解决此问题。预先感谢。