Cannot start stream with NvFBC

[xhejtman]

Sometimes, the browser is unable to sync on the first stream keyframe. Using my nvfbc encoder, I have debug messages showing:

** (python3:9745): WARNING **: 10:45:50.479: got event: 69121, subtype: GstForceKeyUnit

** (python3:9745): WARNING **: 10:45:50.479: Forcing keyframe

** (python3:9745): WARNING **: 10:45:50.503: Forced keyframe

** (python3:9745): WARNING **: 10:45:50.636: got event: 69121, subtype: GstForceKeyUnit

** (python3:9745): WARNING **: 10:45:50.637: Forcing keyframe

** (python3:9745): WARNING **: 10:45:50.669: Forced keyframe

** (python3:9745): WARNING **: 10:45:50.808: got event: 69121, subtype: GstForceKeyUnit

** (python3:9745): WARNING **: 10:45:50.808: Forcing keyframe

** (python3:9745): WARNING **: 10:45:50.836: Forced keyframe

** (python3:9745): WARNING **: 10:45:50.979: got event: 69121, subtype: GstForceKeyUnit

** (python3:9745): WARNING **: 10:45:50.979: Forcing keyframe

** (python3:9745): WARNING **: 10:45:51.003: Forced keyframe

** (python3:9745): WARNING **: 10:45:51.151: got event: 69121, subtype: GstForceKeyUnit

** (python3:9745): WARNING **: 10:45:51.151: Forcing keyframe

** (python3:9745): WARNING **: 10:45:51.169: Forced keyframe

** (python3:9745): WARNING **: 10:45:51.308: got event: 69121, subtype: GstForceKeyUnit

** (python3:9745): WARNING **: 10:45:51.308: Forcing keyframe

** (python3:9745): WARNING **: 10:45:51.336: Forced keyframe

I believe, it is independent of the used encoder. Maybe the keyframe does packet burst and some of it is always lost? It is happening with gstreamer 1.20.3 and 1.24.0, seems to be omnipresent.

After several browser window reload, the stream usually starts.

[ehfd]

@xhejtman Could you post the link for your custom nvfbc plugin?

[ehfd]

In continuum to #30.

[xhejtman]

https://github.com/CERIT-SC/gstreamer-nvimagesrc

[ehfd]

I'm tracking this in #30.