https://chemingway.github.io/tags/audio/ Recent content in Audio on Chris Hemingway Hugo en-GB Sat, 22 Jun 2019 16:29:10 +0100 https://chemingway.github.io/blog/converting-folder-of-wav-files-to-flac/ Sat, 22 Jun 2019 16:29:10 +0100 https://chemingway.github.io/blog/converting-folder-of-wav-files-to-flac/ <p>For audio research, speech and noise corpus&rsquo;s are commonly stored in uncompressed format, generally WAV. This results in very large file sizes, for instance the <a href="https://datashare.is.ed.ac.uk/handle/10283/2651">CSTR VCTK Corpus</a> is 10GB.</p> <p>However, common compression formats like MP3 or Ogg Vorbis would cause distortion of noise signals rendering them useless for comparision against results obtained from the original files.</p> <h2 id="conversion">Conversion</h2> <p>As an exercise, I wrote this script to convert these all into the lossless FLAC format, using <a href="https://ffmpeg.org/">FFmpeg</a> and <a href="https://www.gnu.org/software/parallel/">GNU Parallel</a>. Unfortunately (see <a href="#verifying">below</a>), some files refuse to convert losslessly, but I still consider this some good practice in shell programming.</p>