webrtcsink works in GCP but not in AWS

[Mathieu Duponchelle]

Hey,

This seems fairly self-explanatory to me, on one platform webrtcsink
could not find any encoder with the ability to encode your video
stream, you can check the logs (eg webrtcsink:9) to determine what it
tried and how it failed.

Cheers,
Mathieu

On Wed, 2023-09-20 at 23:57 +0100, Mark Gilbert via gstreamer-devel
wrote:
> Hi Folks
> 
> This simple test command:
> 
> gst-launch-1.0 webrtcsink name=ws congestion-control=homegrown
> meta="meta,name=test" videotestsrc ! queue ! videoconvert ! ws.
> audiotestsrc ! queue ! audioconvert ! ws.
> 
> works perfectly in Google Cloud:
> 
> gst-launch-1.0 webrtcsink name=ws congestion-control=homegrown
> meta="meta,name=test" videotestsrc ! queue ! videoconvert ! ws.
> audiotestsrc ! queue ! audioconvert ! ws.
> Setting pipeline to PAUSED ...
> Pipeline is live and does not need PREROLL ...
> Pipeline is PREROLLED ...
> Setting pipeline to PLAYING ...
> New clock: GstSystemClock
> Redistribute latency...
> Redistribute latency...
> ** all good here, runs and streams**
> 
> but FAILS in Amazon Web Services:
> 
> gst-launch-1.0 webrtcsink name=ws congestion-control=homegrown
> meta="meta,name=test" videotestsrc ! queue ! videoconvert ! ws.
> audiotestsrc ! queue ! audioconvert ! ws. 
> Setting pipeline to PAUSED ...
> Pipeline is live and does not need PREROLL ...
> Pipeline is PREROLLED ...
> Setting pipeline to PLAYING ...
> New clock: GstSystemClock
> Redistribute latency...
> Redistribute latency...
> 0:00:00.019017776  5932 0x7fc57c038c70 ERROR             webrtcsink
> net/webrtc/src/webrtcsink/imp.rs:3143:gstrswebrtc::webrtcsink::imp::B
> aseWebRTCSink::start_stream_discovery_if_needed::{{closure}}:<ws>
> Error running discovery: No caps found for stream video_0
> ERROR: from element /GstPipeline:pipeline0/GstWebRTCSink:ws: There is
> no codec present that can handle the stream's type.
> Additional debug info:
> net/webrtc/src/webrtcsink/imp.rs(3144):
> gstrswebrtc::webrtcsink::imp::BaseWebRTCSink::start_stream_discovery_
> if_needed::{{closure}} (): /GstPipeline:pipeline0/GstWebRTCSink:ws:
> Failed to look up output caps: No caps found for stream video_0
> Execution ended after 0:00:00.004337575
> Setting pipeline to NULL ...
> Freeing pipeline ...
> 
> These were both built using the same installer, from clean Ubuntu
> 22.04 LTS images in the respective platforms. In both cases all
> external ports are open.
> 
> Could anyone explain what this means ?:
> 
> 0:00:00.019017776  5932 0x7fc57c038c70 ERROR             webrtcsink
> net/webrtc/src/webrtcsink/imp.rs:3143:gstrswebrtc::webrtcsink::imp::B
> aseWebRTCSink::start_stream_discovery_if_needed::{{closure}}:<ws>
> Error running discovery: No caps found for stream video_0
> ERROR: from element /GstPipeline:pipeline0/GstWebRTCSink:ws: There is
> no codec present that can handle the stream's type.
> Additional debug info:
> net/webrtc/src/webrtcsink/imp.rs(3144):
> gstrswebrtc::webrtcsink::imp::BaseWebRTCSink::start_stream_discovery_
> if_needed::{{closure}} (): /GstPipeline:pipeline0/GstWebRTCSink:ws:
> Failed to look up output caps: No caps found for stream video_0
> 
> Many thanks !
> 
> 
>