[Bug 796652] qtdemux: Critical warning in gst_qtdemux_request_protection_context

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796652

Xabier Rodríguez Calvar <calvaris at igalia.com> changed:

           What    |Removed                     |Added
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                 CC|                            |tsaunier at gnome.org

--- Comment #2 from Xabier Rodríguez Calvar <calvaris at igalia.com> ---
Protect the code to avoid the warnings and leave it the things as they are now.
g_strv_length is a problem. I am not sure about gst_structure_set and
g_strvfree should be fine according to the doc.

TL&DR

Some streams (specially in YouTube tests) report in the streams themselves
different CDMs (streams can report PlayReady and Widevine but tests require
ClearKey and it should work) than the ones that are going to be used eventually
so should be able to run the query even if the we apparently do not have any
decryptor for the reported systems because the app should give us the proper
one and we should trust it. We'll fail later if the app lies to us with a
system and that decryptor cannot be used or it does not exist.

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