Re: [PATCH v6 0/2] MR2546: winegstreamer: Create extra decodebin to decode compressed stream.

[Rémi Bernon]

It indicates a misuse of the API and is undefined behavior according to Glib / GStreamer semantics. Glib tells about it nicely and returns a sensible value, but it should be fixed on the caller side.
> The g_return family of macros (g_return_if_fail(), g_return_val_if_fail(), g_return_if_reached(), g_return_val_if_reached()) should only be used for programming errors, a typical use case is checking for invalid parameters at the beginning of a public function. They should not be used if you just mean “if (error) return”, they should only be used if you mean “if (bug in program) return”. The program behavior is generally considered undefined after one of these checks fails. They are not intended for normal control flow, only to give a perhaps-helpful warning before giving up.
>
> https://docs.gtk.org/glib/logging.html

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https://gitlab.winehq.org/wine/wine/-/merge_requests/2546#note_31696