amc: add support for dynamic bitrate change
I use h264 encoder on Android 10 device. There is no effect after call
g_object_set(gstplugin, "bitrate", value, NULL); when pipeline in playing state. The bitrate value can be set only on stopped pipeline. It would be nice to add bitrate change feature during playing state. This is feature request issue. I use gstreamer version 1.16.3. Thanks!