FFmpeg audio not work on mobile devices

i'm using code audio in ffmpeg but work on pc but not work on mobile, on mobile audio mute Please tell me fix it, thank you

-af "pan=stereo|c0<c0+0*c1|c1<c0+0*c1,aeval=val(1)|-val(1),volume=1.5" -vcodec libx264 -acodec libmp3lame -b:a 128k -ar 44100