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fallbackswitch: should handle buffers with no PTS

I have something like this: webrtcbin ! decodebin (video) ! fallbackswitch. It works well enough but I sometimes get this stopping the pipeline (FlowError::Error):

0:00:40.633708735 914332 0x5616fed8b700 ERROR         fallbackswitch imp.rs:1100:gstfallbackswitch::fallbackswitch::imp:<fallbackswitch1> Only buffers with PTS supported
0:00:40.633788198 914332 0x5616fed8b700 ERROR         fallbackswitch imp.rs:235:gstfallbackswitch::fallbackswitch::imp:<fallbackswitch1:sink> Only buffers with PTS supported

That seems to be because:

  • rtpjitterbuffer sets backwards timestamps to the same timestamp.
  • h264parse unsets the pts of the second buffer.
  • this second buffer is decoded to a frame without pts and reaches fallbackswitch.

It would be good that those buffers are handled somehow. Could they be pushed directly downstream instead?

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