Opus streaming directly from file

[JoeArtAV]

Hello. I'm looking to build a pipeline to stream a static audio file over
UDP, and I'd like to use the Opus codec for streaming.

- I can currently stream from an MP3 file, like so:

Sender:
*gst-launch-1.0 filesrc location=file.mp3 ! decodebin ! audioconvert !
rtpL16pay ! udpsink port=500 host=192.168.0.1 *

Receiver:
*gst-launch-1.0 udpsrc port=5000 caps="application/x-rtp,
media=(string)audio, format=(string)S32LE, layout=(string)interleaved,
clock-rate=(int)44100, channels=(int)2, payload=(int)0" ! rtpL16depay !
playsink*

- I can play back an Opus file locally like so:

*gst-launch-1.0 filesrc location="file.opus" ! decodebin ! audioconvert !
playsink
*
- And I can stream a test source via UDP with the Opus codec like so:

Sender:
*gst-launch-1.0 audiotestsrc ! audioconvert ! audioresample ! opusenc !
rtpopuspay ! udpsink host=192.168.0.1 port=5000*

Receiver:
*gst-launch-1.0 udpsrc
caps="application/x-rtp,media=(string)audio,clock-rate=(int)48000,encoding-name=(string)X-GST-OPUS-DRAFT-SPITTKA-00"
port=5000 ! rtpjitterbuffer latency=1000 mode=1 ! rtpopusdepay ! opusdec !
playsink*

Now, I would like to construct something like this for the sender:
*gst-launch-1.0 filesrc location="file.opus" ! rtpopuspay ! udpsink
host=192.168.0.1 port=5000
*
But this pipeline comes back with an error "No input format was negotiated"
etc.

Is it possible? I'd like to avoid re-encoding on the fly (e.g. from MP3 to
Opus) in order to maximise efficiency. Is it possible to stream Opus to UDP
by directly reading from a .opus file?

Thanks!



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