python-3.x - 无法使用Gstreamer-Python设置两个摄像机的参数

Question

我正在尝试使用Gstreamer(Python3)同时设置两个摄像机的摄像机参数(曝光和增益)。我使用相机序列ID创建了两个单独的管道，此后遵循了用于单个(唯一)相机管道的方法。但是，执行脚本后，仅会为其中一台摄像机设置参数。下面的代码中我应该修改什么？ TIA。

#!/usr/bin/env python3


import time
import sys
import gi

gi.require_version("Tcam", "0.1")
gi.require_version("Gst", "1.0")

from gi.repository import Tcam, Gst


def main():

    Gst.init(sys.argv)  # init gstreamer

    serial1='05020863'
    serial2='05020864'

    pipeline1 = Gst.parse_launch("tcambin name=source1"
                                " ! video/x-raw,format=BGRx,width=720,height=540,framerate=30/1"
                                " ! tee name=t"
                                " ! queue"
                                " ! videoconvert"
                                " ! ximagesink"
                                " t."
                                " ! queue"
                                " ! videoconvert"
                                " ! avimux"
                                " ! filesink name=fsink1")

    pipeline2 = Gst.parse_launch("tcambin name=source2"
                            " ! video/x-raw,format=BGRx,width=720,height=540,framerate=30/1"
                            " ! tee name=t"
                            " ! queue"
                            " ! videoconvert"
                            " ! ximagesink"
                            " t."
                            " ! queue"
                            " ! videoconvert"
                            " ! avimux"
                            " ! filesink name=fsink2")

    if serial1 is not None:
        camera1 = pipeline1.get_by_name("source1")
        camera1.set_property("serial", serial1)

    if serial2 is not None:
        camera2 = pipeline2.get_by_name("source2")
        camera2.set_property("serial",serial2)

    file_location1 = "/home/pandey/TIS/tiscamera/examples/python/tiscamera-save-stream-1.avi"
    file_location2 = "/home/pandey/TIS/tiscamera/examples/python/tiscamera-save-stream-2.avi"

    camera1 = Gst.ElementFactory.make("tcambin")
    camera2 = Gst.ElementFactory.make("tcambin")

    camera1.set_state(Gst.State.READY)
    camera1.set_tcam_property("Exposure Auto", False)
    camera1.set_tcam_property("Gain Auto", False)

    camera2.set_state(Gst.State.READY)
    camera2.set_tcam_property("Exposure Auto", False)
    camera2.set_tcam_property("Gain Auto", False)

    camera1.set_tcam_property("Exposure Time",10)
    camera1.set_tcam_property("Gain",450)

    camera2.set_tcam_property("Exposure Time",10)
    camera2.set_tcam_property("Gain",450)


    fsink1 = pipeline1.get_by_name("fsink1")
    
    fsink1.set_property("location", file_location1)

    fsink2 = pipeline2.get_by_name("fsink2")
    
    fsink2.set_property("location", file_location2)


    pipeline1.set_state(Gst.State.PLAYING)

    pipeline2.set_state(Gst.State.PLAYING)




    print("Press Ctrl-C to stop.")

    try:
        while True:
            time.sleep(1)
    except KeyboardInterrupt:
        pass
    finally:
        pipeline1.set_state(Gst.State.NULL)
        pipeline2.set_state(Gst.State.NULL)


if __name__ == "__main__":
    main()

Answer 1

您的问题在这里:

camera1 = Gst.ElementFactory.make("tcambin")
camera2 = Gst.ElementFactory.make("tcambin")

为什么要创建两个与管道完全分离的新元素并准备就绪？您应该只使用(就像您之前正确地做过的一样)

camera1 = pipeline1.get_by_name("source1")
camera2 = pipeline1.get_by_name("source2")

获得对管道中实际元素的引用。