Gstreamer如何从总线的STATE_CHANGED消息中获取元素信息

Question

我正在使用 Gstreamer 及其 Python 绑定。考虑以下 bus_call 函数：

import sys
from gi.repository import Gst


def bus_call(bus, message, loop):
    t = message.type
    if t == Gst.MessageType.EOS:
        print("Bus call: End-of-stream\n")
        # loop.quit()
    elif t == Gst.MessageType.WARNING:
        err, debug = message.parse_warning()
        sys.stderr.write("Bus call: Warning: %s: %s\n" % (err, debug))
    elif t == Gst.MessageType.ERROR:
        err, debug = message.parse_error()
        sys.stderr.write("Bus call: Error: %s: %s\n" % (err, debug))
        # loop.quit()
    elif t == Gst.MessageType.BUFFERING:
        print("Bus call: Buffering\n")
    elif t == Gst.MessageType.STATE_CHANGED:
        old_state, new_state, pending_state = message.parse_state_changed()
        print((
            f"Bus call: Pipeline state changed from {old_state.value_nick} to {new_state.value_nick} "
            f"(pending {pending_state.value_nick})"
        ))
    else:
        print(f"Bus call: {message}\n")
    return True

当消息类型为Gst.MessageType.STATE_CHANGED时，如何获取状态改变的元素？

Answer 1

不确定我是否理解正确，但您可以尝试类似的操作：

old_state, new_state, pending_state = message.parse_state_changed()
print('%s : State changed from %s to %s' % (message.src.get_name(), old_state, new_state))

Gstreamer如何从总线的STATE_CHANGED消息中获取元素信息

Gstreamer how to get element information from STATE_CHANGED message from the bus

python

state

element

bus

gstreamer