Let ASR result be cached and reused in case of processing twice the same file
The Sphinx component spend a lot of time (like 6 times the duration of the video) to do the ASR. It often happen that we reprocess the same file and other long lasting components (shot detection, normalisation, classification) saves their results and reuse them to prevent from spending twice the same amount of time on the same file. This functionality should be enabled on Sphinx.