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dc8101574d
Implement `lavfi-tempo` audio filter, which uses `atempo` or `ascale` form libavfilter for setting the tempo. Users (myself included) seem to be always looking for alternative tempo scalers to try, and this provides a faster implementation (or two), and may prove useful beyond performance/speed. `atempo` is picked as a default, and as a fall-back if `ascale` is not available. Signed-off-by: Mohammad AlSaleh <CE.Mohammad.AlSaleh@gmail.com>