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video-converter: switch to using a thread pool ..

Mathieu Duponchelle requested to merge meh/gst-plugins-base:convert-pool into master

and expose API to allow creating a converter with a custom thread pool, and make use of that API in videoaggregator.

When setting certain properties, such as cropping or the scaled size of pads, a new converter is created by videoaggregator.

Before that patch, this implied spawning new threads, potentially at each aggregate cycle when interpolating pad properties. This is obviously wasteful, and re-using a thread pool removes that overhead.

Depends on gstreamer!682 (closed)

Edited by Mathieu Duponchelle

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