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fakevideosink: Allow allocation meta flags fine-tuning

Philippe Normand requested to merge philn/gst-plugins-bad:fakevideosink-blend-subtitles into master

In some scenarios the fakevideosink shouldn't advertize the overlay-composition meta for instance, so that overlay elements perform subtitles blending themselves.

Only advertizing the meta in the allocation query is insufficient, the metas are not handled anyway. Hence fallback to subtitles overlay blending performed in textoverlay.

The use-case for this is SSIM-based subtitles rendering checks in gst-integration-test-suites.

Edited by Philippe Normand

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