The program can't stop when searches over all files under folders and subfolders

Hi,

  I tried to convert all wma file to mp3 by av library and then I delete
the wma file. Even after all files are converted to mp3, the program is
still running. Is there anything wrong in this program?


################
library(av)

all_files <- list.files(path = ".", pattern = '*.wma', all.files = FALSE,
           full.names = FALSE, recursive = TRUE,
           ignore.case = FALSE, include.dirs = FALSE, no.. = FALSE)

for(i in all_files)
{
  av_audio_convert(
    audio = i,
    output = gsub(".wma", ".mp3", i),
    format = NULL,
    channels = NULL,
    sample_rate = NULL,
    start_time = NULL,
    total_time = NULL,
    verbose = TRUE
  )
  file.remove(i)
}

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