Not-negotiated (-4) errors and different behaviour for rtph264depay since we have to specify caps byte-stream

[Tim Müller]

Hi Marc,

> When I upgraded from Gstreamer 1.12.2 to version 1.18.2 then I get
> for some of the cameras next error 
> 
> ../gst/rtsp/gstrtspsrc.c(6168): gst_rtspsrc_loop ():
> /GstPipeline:pipeline0/GstRTSPSrc:rtspsrc0:
> 
> streaming stopped, reason not-negotiated (-4).
> 
> This was not the case with version 1.12.2.
> 
> When I specify caps video/x-h264, stream-format=(string)byte-stream,
> then all connections can be established.
> 
> Used pipeline is Rtspsrc ! rtph264depay! h264parse ! qtmux !
> filesink 
> 
> Could it be the case that in previous versions the negotiation was
> done automatic for byte-stream and/or avc?
> 
> Will this remain like this, or will this be changed again in the
> future?
> 
> Why do we now have to specify the stream-format and why is this only
> for certain cameras?

This is just a guess, but I believe at some point a few releases ago
mp4mux/qtmux got stricter and refused caps changes at runtime (for avc
format at least).

One would need to check a debug log to see what the problem is in your
specific case.

Cheers
 Tim