[Cin] hw filtering examples?

[Andrew Randrianasulu]

I am trying to find out why our (cinelerra-gg) ffmpeg integration refuses
to load filtergraph < and crashes and burns! > if I set hw decoding to any
value (it works for sw decoding).

So far I found this example (not accepted) on ffmpeg-devel, but I am still
not sure how to apply ot for our case (we use av_buffersink_get_frame() )


https://ffmpeg.org/pipermail/ffmpeg-devel/2018-August/233555.html

In general, I hope to get hw decoding (now via vulkan ) + libplacebo doing
tonemapping purely on GPU *before* frames ingested into cingg for further
(mostly software/host) manipulation, display and encode.

But I guess for this I need to pass around hw_device_context created for
decoder for this media/input file? (our filtering options are either global
or per-file)

filter_graph->filters[i]->hw_device_ctx = av_buffer_ref(hw_device_ctx);

Paul, your lavfi-preview does not have hw filters previews yet, or I read
sources too diagonally?
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