the main problem is that what's good or bad with hls/dash/rtsp between ffmpeg and gstreamer?
because ffmpeg has implemention with hls/dash/rtsp, gstreamer also.
if i want to use ffmpeg's hls/dash/rtsp, i find that there are no direct support in gstreamer.
should I implement hls/dash/rtsp source seprately for them or just make a fakesrc?
Using ffmpeg streaming is not and will likely never be supported in GStreamer. HLS/DASH and RTSP are all supported in GStreamer natively. If you find any compliance or compatibility issue, let us know.