[英]convert gstreamer pipeline to python code
我正在尝试使用 gi 库将 gstreamer 管道转换为 python 代码。
这是在终端中成功运行的管道:
gst-launch-1.0 rtspsrc location="rtsp://admin:123456@192.168.0.150:554/H264?ch=1&subtype=0&proto=Onvif" latency=300 ! rtph264depay ! h264parse ! nvv4l2decoder drop-frame-interval=1 ! nvvideoconvert ! video/x-raw,width=1920,height=1080,formate=I420 ! queue ! nveglglessink window-x=0 window-y=0 window-width=1080 window-height=720
但是在使用 python 代码运行相同的管道时,没有显示 rtsp 流的输出窗口,终端上也没有错误。 终端只是卡住,直到我按 ctrl+c。
这是我用来运行 gstreamer 命令的代码:
import gi
gi.require_version("Gst", "1.0")
from gi.repository import Gst, GObject
def main(device):
GObject.threads_init()
Gst.init(None)
pipeline = Gst.Pipeline()
source = Gst.ElementFactory.make("rtspsrc", "video-source")
source.set_property("location", device)
source.set_property("latency", 300)
pipeline.add(source)
depay = Gst.ElementFactory.make("rtph264depay", "depay")
pipeline.add(depay)
source.link(depay)
parse = Gst.ElementFactory.make("h264parse", "parse")
pipeline.add(parse)
depay.link(parse)
decoder = Gst.ElementFactory.make("nvv4l2decoder", "decoder")
decoder.set_property("drop-frame-interval", 2)
pipeline.add(decoder)
parse.link(decoder)
convert = Gst.ElementFactory.make("nvvideoconvert", "convert")
pipeline.add(convert)
decoder.link(convert)
caps = Gst.Caps.from_string("video/x-raw,width=1920,height=1080,formate=I420")
filter = Gst.ElementFactory.make("capsfilter", "filter")
filter.set_property("caps", caps)
pipeline.add(filter)
convert.link(filter)
queue = Gst.ElementFactory.make("queue", "queue")
pipeline.add(queue)
filter.link(queue)
sink = Gst.ElementFactory.make("nveglglessink", "video-sink")
sink.set_property("window-x", 0)
sink.set_property("window-y", 0)
sink.set_property("window-width", 1280)
sink.set_property("window-height", 720)
pipeline.add(sink)
queue.link(sink)
loop = GObject.MainLoop()
pipeline.set_state(Gst.State.PLAYING)
try:
loop.run()
except:
pass
pipeline.set_state(Gst.State.NULL)
if __name__ == "__main__":
main("rtsp://admin:123456@192.168.0.150:554/H264?ch=1&subtype=0&proto=Onvif")
有谁知道是什么错误? 谢谢!
它不起作用的原因是因为rtspsrc
的源垫是所谓的“有时垫” 。 此处的链接很好地解释了它,但基本上您无法预先知道rtspsrc
多少垫可用,因为这取决于 RTSP 服务器提供的 SDP。
因此,您应该收听rtspsrc
的“ rtspsrc
"pad-added"
信号,您可以在其中将管道的其余部分链接到刚刚出现在回调中的源焊盘。
所以总结如下:
def main(device):
GObject.threads_init()
Gst.init(None)
pipeline = Gst.Pipeline()
source = Gst.ElementFactory.make("rtspsrc", "video-source")
source.set_property("location", device)
source.set_property("latency", 300)
source.connect("pad-added", on_rtspsrc_pad_added)
pipeline.add(source)
# We will add/link the rest of the pipeline later
loop = GObject.MainLoop()
pipeline.set_state(Gst.State.PLAYING)
try:
loop.run()
except:
pass
pipeline.set_state(Gst.State.NULL)
def on_rtspsrc_pad_added(rtspsrc, pad, *user_data):
# Create the rest of your pipeline here and link it
depay = Gst.ElementFactory.make("rtph264depay", "depay")
pipeline.add(depay)
rtspsrc.link(depay)
# and so on ....
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