[bug#54744] [PATCH] Update gstreamer and its families to 1.20.1.

[Zhu Zihao <all_but_last@163.com>]

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Liliana Marie Prikler <liliana.prikler@ist.tugraz.at> writes:

>> I checked the ugly and good and gst-libav, they do rely on
>> gst-plugins-base, but no propagation needed. I don't find a reason
>> that they really requires propagation, because their content just a
>> so file.
>> Gstreamer in Nixpkgs also don't have propagations for above packages.
> I personally found that missing these GstElements at runtime can screw
> you up.  If that is no longer the case, then fair enough, but you need
> to prove that by launching a gst pipeline using a plugin from e.g. gst-
> plugins-good without having gst-plugins-base in your GST paths.

Re-check the source code of good,ugly,gst-libav. It looks that some good
plugins will use gst_element_factory_make to create element in base,
It's reasonable for gst-plugins-good to propagates
gst-plugins-base(propagation of gstreamer is not neeeded, I think)

But for ugly and gst-libav. I don't see such code in their source code.
So It's better to remove their propagated-inputs.

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Zihao

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