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gstreamer-cheat-sheet/rtmp.md
Matthew Clark d12138e065 Improve RTMP examples, amongst other things
2018-02-21 22:46:55 +00:00

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RTMP (GStreamer command-line cheat sheet)

GStreamer can receive an RTMP stream from an RTMP server. It can also send an RTMP stream to an RTMP server.

If you need your own RTMP server, the Nginx RTMP extension works quite well though is no longer supported.

Play an RTMP stream

To play from RTMP server, playbin can be used (as with files and HLS streams):

gst-launch-1.0 playbin uri=$RTMP_SRC

A test RTMP stream is available at rtmp://184.72.239.149/vod/BigBuckBunny_115k.mov which serves as a useful example:

gst-launch-1.0 playbin uri='rtmp://184.72.239.149/vod/BigBuckBunny_115k.mov'

Instead of using playbin, it's possible to get video only with uridecodebin then shown with autovideosink:

gst-launch-1.0 uridecodebin uri=$RTMP_SRC ! autovideosink

Or as a step further we can split out into the source and decode too. This does video:

gst-launch-1.0 rtmpsrc location=$RTMP_SRC ! decodebin ! autovideosink

and this does the audio:

gst-launch-1.0 rtmpsrc name=rtmpsrc location=$RTMP_SRC ! decodebin ! \
queue ! audioconvert ! autoaudiosink

We can vget flvdemux to pull out the audio:

gst-launch-1.0 rtmpsrc location=$RTMP_SRC ! \
    flvdemux name=t  t.audio ! decodebin ! autoaudiosink

Incidentally, all of these work with a direct flv file:

gst-launch-1.0 filesrc location="/Users/clarkm22/workspace/silver/assets/test.flv" ! \
    flvdemux name=t  t.audio ! decodebin ! autoaudiosink

If you want to use flvdemux to do the video, you need to capture the audio too or else it will fail. This example puts it in fakesink which is basically discarding it:

gst-launch-1.0 rtmpsrc location="$RTMP_SRC" ! \
    flvdemux name=demux \
    demux.audio ! queue ! decodebin ! fakesink \
    demux.video ! queue ! decodebin ! autovideosink

You could then use this to capture the RTMP as an MP4, e.g.

gst-launch-1.0 -e rtmpsrc location="$RTMP_SRC" ! \
    flvdemux name=demux \
    demux.audio ! queue ! decodebin ! audioconvert ! faac bitrate=32000 ! mux. \
    demux.video ! queue ! decodebin ! videoconvert ! video/x-raw,format=I420 ! x264enc speed-preset=superfast tune=zerolatency psy-tune=grain sync-lookahead=5 bitrate=480 key-int-max=50 ref=2  ! mux. \
    mp4mux name=mux ! filesink location="out.mp4"