diff --git a/.github/workflows/tox.yml b/.github/workflows/tox.yml
index e94459f..b06508a 100644
--- a/.github/workflows/tox.yml
+++ b/.github/workflows/tox.yml
@@ -30,13 +30,13 @@ jobs:
           python-version: ${{ matrix.py }}
       - uses: actions/checkout@v3
       - name: Install soundlibs Ubuntu
-        run: sudo apt-get update && sudo apt-get install --no-install-recommends -y --fix-missing pkg-config libsndfile1 sox
+        run: sudo apt-get update && sudo apt-get install --no-install-recommends -y --fix-missing pkg-config libsndfile1 sox ffmpeg
         if: matrix.os == 'ubuntu-latest'
       - name: Install soundlibs MacOs
-        run: brew install libsndfile llvm libomp sox
+        run: brew install libsndfile llvm libomp sox ffmpeg
         if: matrix.os == 'macos-latest-xlarge'
       - name: Install soundlibs Windows
-        run: choco install libsndfile sox.portable flac
+        run: choco install libsndfile sox.portable flac ffmpeg
         if: matrix.os == 'windows-latest'
       - name: Upgrade pip
         run: python -m pip install -U pip
diff --git a/basic_pitch/data/datasets/slakh.py b/basic_pitch/data/datasets/slakh.py
index 6801cdb..260a77b 100644
--- a/basic_pitch/data/datasets/slakh.py
+++ b/basic_pitch/data/datasets/slakh.py
@@ -44,7 +44,7 @@ def process(self, element: Tuple[str, str]) -> Any:
         import tempfile
 
         import apache_beam as beam
-        import sox
+        import ffmpeg
 
         from basic_pitch.constants import (
             AUDIO_N_CHANNELS,
@@ -77,11 +77,10 @@ def process(self, element: Tuple[str, str]) -> Any:
                 return None
 
             local_wav_path = "{}_tmp.wav".format(track_local.audio_path)
-            tfm = sox.Transformer()
-            tfm.rate(AUDIO_SAMPLE_RATE)
-            tfm.channels(AUDIO_N_CHANNELS)
             try:
-                tfm.build(track_local.audio_path, local_wav_path)
+                ffmpeg.input(track_local.audio_path).output(
+                    local_wav_path, ar=AUDIO_SAMPLE_RATE, ac=AUDIO_N_CHANNELS
+                ).run()
             except Exception as e:
                 logging.info(f"Could not process {local_wav_path}. Exception: {e}")
                 return None
@@ -113,7 +112,7 @@ def process(self, element: List[str]) -> List[Any]:
         import tempfile
 
         import numpy as np
-        import sox
+        import ffmpeg
 
         from basic_pitch.constants import (
             AUDIO_N_CHANNELS,
@@ -145,12 +144,11 @@ def process(self, element: List[str]) -> List[Any]:
                         d.write(s.read())
 
                 local_wav_path = "{}_tmp.wav".format(track_local.audio_path)
-                tfm = sox.Transformer()
-                tfm.rate(AUDIO_SAMPLE_RATE)
-                tfm.channels(AUDIO_N_CHANNELS)
-                tfm.build(track_local.audio_path, local_wav_path)
+                ffmpeg.input(track_local.audio_path).output(
+                    local_wav_path, ar=AUDIO_SAMPLE_RATE, ac=AUDIO_N_CHANNELS
+                ).run()
 
-                duration = sox.file_info.duration(local_wav_path)
+                duration = float(ffmpeg.probe(local_wav_path)["format"]["duration"])
                 time_scale = np.arange(0, duration + ANNOTATION_HOP, ANNOTATION_HOP)
                 n_time_frames = len(time_scale)
 
diff --git a/pyproject.toml b/pyproject.toml
index 4e23b0f..8843074 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -57,7 +57,8 @@ data = [
     "apache_beam",
     "mirdata",
     "smart_open",
-    "sox"
+    "sox",
+    "ffmpeg-python"
 ]
 test = [
 	"basic_pitch[data]",