Batch MP3 Video Converter

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1.2.10: add settings of fixed 44.1kHz for converting High-res to mp3, based on User Advice
1.2.7: add settings of mono/stereo and mp3/m4a and 32kbps, based on User Advice
1.2.4: add suffix setting, based on User Advice
1.2.0: update library for android 8 and 9 to fix errors, based on User Advice
1.1.22: bug fix for android 8 and 9 on background conversion, based on User Advice
1.1.21: add a feature of editing filename, title, album and artist of converted files, based on User Advice