diff --git a/lib/ffmpeg/transcoder.rb b/lib/ffmpeg/transcoder.rb
index c9dfe83d..ee29b417 100644
--- a/lib/ffmpeg/transcoder.rb
+++ b/lib/ffmpeg/transcoder.rb
@@ -33,10 +33,11 @@ def initialize(movie, output_file, options = EncodingOptions.new, transcoder_opt
       # This is because ffmpeg can't reliably handle inputs that contain frames with differing resolutions particularly for trimming with `filter_complex`
       @movie.check_frame_resolutions if @transcoder_options[:permit_dynamic_resolution_pre_encode]
 
+      temp_dir = ENV.fetch('TMPDIR', '/tmp')
       if requires_pre_encode
         @movie.paths.each do |path|
           # Make the interim path folder if it doesn't exist
-          dirname = "/tmp/interim"
+          dirname = "#{temp_dir}/interim"
           unless File.directory?(dirname)
             FileUtils.mkdir_p(dirname)
           end
@@ -172,7 +173,8 @@ def transcode_movie
       pre_encode_if_necessary
       # change output file to /tmp/interim/output.mp4 needs to be unique to every run
       # get file extension from original file - dont overwrite original file
-      temp_output_file = "/tmp/interim/#{File.basename(@output_file, File.extname(@output_file))}_#{SecureRandom.urlsafe_base64}#{File.extname(@output_file)}"
+      temp_dir = ENV.fetch('TMPDIR', '/tmp')
+      temp_output_file = "#{temp_dir}/interim/#{File.basename(@output_file, File.extname(@output_file))}_#{SecureRandom.urlsafe_base64}#{File.extname(@output_file)}"
       @command = "#{@movie.ffmpeg_command} -y #{@raw_options} #{Shellwords.escape(temp_output_file)}"
 
       FFMPEG.logger.info("Running transcoding...\n#{@command}\n")