Config.enableStatisticsCallback not called when i merge two videos

[azhar2777]

I am trying to merge two videos and its working fine with this command String[] command = {"-y", "-i", Variables.duet_firstVideo, "-i", Variables.duet_secondVideo, "-preset", "ultrafast", "-filter_complex", "[0][1]scale2ref='ohmdar':'if(lt(main_h,ih),ih,main_h)'[0s][1s];[1s][0s]scale2ref='ohmdar':'if(lt(main_h,ih),ih,main_h)'[1s][0s];[0s][1s]hstack,setsar=1", "-vsync", "2", outputVideo};

Now i am trying to show progress bar while it is merging so i used Config.enableStatisticsCallback as mentioned in docs, but i see Config.enableStatisticsCallback it is never called however Config.enableLogCallback is calling up

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