Failure in minimal demo with rtmpsink, nginx-rtmp-plugin and rtmpsrc

[F32]

Hi,


I'm working on Ubuntu 20.04, shipped with:
 - gstreamer 1.16.2
 - ffmpeg 4.2.2
 - nginx 1.17.10
 - libnginx-mod-rtmp 1.17.10
(all from Ubuntu official repo)


The nginx configuration is:
> rtmp {
>        server {
>                listen 1935;
>                application tv {
>                        live on;
>                }
>        }
> }
so that it acts as a media server.


With this command, I can push a test video stream to nginx:
> gst-launch-1.0 videotestsrc ! x264enc ! flvmux ! rtmpsink location='rtmp://127.0.0.1/tv live=1'


I can open the video stream with ffmpeg:
> ffplay rtmp://127.0.0.1/tv


However when I tried several gstreamer commands, all of them failed:


> $ gst-launch-1.0 playbin uri=rtmp://127.0.0.1/tv
> Setting pipeline to PAUSED ...
> ERROR: Pipeline doesn't want to pause.
> ERROR: from element /GstURIDecodeBin:uridecodebin0: Could not parse RTMP URI
> Additional debug info:
> gsturidecodebin.c(1413): gen_source_element (): /GstPlayBin:playbin0/GstURIDecodeBin:uridecodebin0:
> No element accepted URI 'rtmp://127.0.0.1/tv'
> Setting pipeline to NULL ...
> Freeing pipeline ...


> $ gst-launch-1.0 rtmpsrc location='rtmp://127.0.0.1/tv live=1' ! decodebin ! autovideosink
> Setting pipeline to PAUSED ...
> ERROR: Pipeline doesn't want to pause.
> ERROR: from element /GstPipeline:pipeline0/GstRTMPSrc:rtmpsrc0: Could not open resource for reading.
> Additional debug info:
> gstrtmpsrc.c(626): gst_rtmp_src_start (): /GstPipeline:pipeline0/GstRTMPSrc:rtmpsrc0:
> No filename given
> Setting pipeline to NULL ...
> Freeing pipeline ...


> $ gst-launch-1.0 rtmpsrc location='rtmp://127.0.0.1/tv live=1' ! flvdemux ! decodebin ! autovideosink
> Setting pipeline to PAUSED ...
> ERROR: Pipeline doesn't want to pause.
> ERROR: from element /GstPipeline:pipeline0/GstRTMPSrc:rtmpsrc0: Could not open resource for reading.
> Additional debug info:
> gstrtmpsrc.c(626): gst_rtmp_src_start (): /GstPipeline:pipeline0/GstRTMPSrc:rtmpsrc0:
> No filename given
> Setting pipeline to NULL ...
> Freeing pipeline ...


I also tried encoding with avenc_flv, but there's no difference.


I'd like to know what is the cause of the failure, and what is the correct way of playing rtmp stream with gstreamer.


Regards
Windy


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