Add notes about manually installing sndfile and install it on CI

.github/workflows/build-and-test.yml

@@ -20,6 +20,8 @@ jobs:
         id: setup-ffmpeg
       - name: Check FFMpeg
         run: ffmpeg -version
+      - name: Manually install sndfile
+        run: sudo apt install libsndfile1
       - name: Install
         run: pip install -e .[dev,test,docs]
       - name: Run tests

README.md

@@ -28,11 +28,12 @@ pip install autosubsync
 Make sure you have Pip, e.g., `sudo apt-get install python-pip`.
 Then install [FFmpeg](https://www.ffmpeg.org/) and this package
 ```
-sudo apt-get install ffmpeg
+sudo apt install ffmpeg
+sudo apt install libsndfile1 # sometimes optional
 sudo pip install autosubsync
 ```
 
-Note: If you are running Ubuntu 14 (but not 12 and 16, which are fine), you'll need to [jump some more hoops to install FFmpeg](https://www.faqforge.com/linux/how-to-install-ffmpeg-on-ubuntu-14-04/).
+The `libsndfile1` is sometimes but not always needed due to https://github.com/bastibe/python-soundfile/issues/258.
 
 ## Usage