ruby on rails - Convert WAV into MP3 using FFMPG with the carrier_wave gem -

inside "wave_uploader.rb" script have following code:

class pictureuploader < carrierwave::uploader::base   include carrierwave::minimagick   include carrierwave::mimetypes    version :wav     process :convert_to_mp3      def convert_to_mp3       temp_path = tempfile.new([file.basename(current_path), '.mp3']).path        `ffmpeg -t 15 -i #{current_path} -acodec libmp3lame -f mp3 #{temp_path}`        file.unlink(current_path)       fileutils.mv(temp_path, current_path)     end      def full_filename(for_file)       super.chomp(file.extname(super)) + '.mp3'     end   end 

i trying convert wav file 20 second mp3 file , delete wav file once converted. code above runs can't find converted mp3 file guessing did not work correctly.

at end of wave_uploader.rb have code returns unique name once processed commented out code out thinking code below causing wav file not converted mp3.

# def filename #   "#{secure_token}.#{file.extension}" if original_filename.present? # end  # def secure_token #   var = :"@#{mounted_as}_secure_token" #   model.instance_variable_get(var) or model.instance_variable_set(var, securerandom.uuid) end 

any appreciated on how working right.

one thing see is:

`ffmpeg -t 15 -i #{current_path} -acodec libmp3lame -f mp3 #{temp_path}` 

if ffmpeg not in path os won't able find it, , return error, however, because you're using backticks, os can't return string stderr, error displayed. backticks return stdout.

to debug try command-line:

which ffmpeg 

if ffmpeg found, instead of:

`ffmpeg -t 15 -i #{current_path} -acodec libmp3lame -f mp3 #{temp_path}` 

try:

puts `which ffmpeg` 

and see output.

i suspect it's not in path, you'll have locate , provide full path on disk.

also, it's better move original file, move new file original file's name, delete original or leave ".bak" file. way original kept until code has processed:

  fileutils.mv(current_path, current_path + '.bak')   fileutils.mv(temp_path, current_path)   file.unlink(current_path + '.bak') # <-- optional