Android ffmpeg apply video effects take log time -

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I'm using commands to implement the effect, to apply effects for 2 minutes of video May take 6-8 minutes. Please help me improve the effective time for the ffmpeg command. 

  string commandstracker "ffmpeg -y -i" + mVideoData.getPath () + "- experimental-vf curves = vintage -s 640x480 -r30 -spect 4: 3 -Ab 48000 - A2R 22050-B20979 -Vodcast MPEG4 / SD Card / VideoKit / CRVMMP4 ";


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