(master) Crée une configuration Docker pour l'harmonisation du volume des fichiers sons

.docker/normalize/Dockerfile

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+FROM jrottenberg/ffmpeg:4.2-ubuntu
+
+RUN apt-get -yqq update && \
+    apt-get install -yq --no-install-recommends python3-pip && \
+    apt-get autoremove -y && \
+    apt-get clean -y
+
+RUN pip3 install ffmpeg-normalize
+
+COPY normalize.sh /normalize.sh
+RUN chmod +x /normalize.sh
+
+ENTRYPOINT ["/normalize.sh"]

.docker/normalize/normalize.md

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+# Noramlizing audio level
+
+> Audio normalization is the application of a constant amount of gain to an audio recording to bring the amplitude to a target level (the norm). Because the same amount of gain is applied across the entire recording, the signal-to-noise ratio and relative dynamics are unchanged. Normalization is one of the functions commonly provided by a digital audio workstation. https://en.wikipedia.org/wiki/Audio_normalization
+
+In other words, normalizing Kaamelott sounds allow each sound to have a ~same perceived audio loudness. So it reduce the volume of very loud sound and increase the volume of less audible ones. 
+
+## Prerequisite
+
+- install `ffmpeg`  using your preferred package managed (brew or apt-get for eg) or [this link](https://www.ffmpeg.org/download.html)
+- install `ffmpeg-normalize` following [this](https://github.com/slhck/ffmpeg-normalize#installation)
+
+With Docker:
+
+```
+docker build -t ks-normalize .docker/normalize/
+```
+
+## Usage
+
+Normalize a given sound file
+
+```
+docker run --rm -v $(pwd):$(pwd) -w $(pwd) ks-normalize sounds/victoriae_mundis.mp3
+```
+It will copy replace the file with the new normalized sound to `victoriae_mundis.mp3`. 

.docker/normalize/normalize.sh

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+#!/bin/bash
+
+TEMP_FILE=temp.mp3
+PADDED_FILE=paddedNormalized.temp.mp3
+
+# Check than ffmpeg && ffmpeg-normalize is installed
+if ! [ -x "$(command -v ffmpeg)" ]; then
+  echo 'Error: ffmpeg is not installed.' >&2
+  exit 1
+fi
+if ! [ -x "$(command -v ffmpeg-normalize)" ]; then
+  echo 'Error: ffmpeg-normalize is not installed.' >&2
+  exit 1
+fi
+
+# Check that input mp3 is present & exist
+if [ -n "$1" ]
+then
+  inputFile=$1
+else
+  echo 'Error: missing input file' >&2
+  exit 1
+fi
+if [ ! -f ./$inputFile ]; then
+    echo "File not found!"
+fi
+
+cleanup () {
+  rm -f $TEMP_FILE
+  rm -f $PADDED_FILE
+  rm -f final.mp3
+}
+
+cleanup
+
+# Normalize the file
+# Due to an issue with ffmpeg-normalize, file shorter than 3s cannot be normalized
+# The following use a solution from https://github.com/slhck/ffmpeg-normalize/issues/87#issuecomment-488944192
+ffmpeg -i $inputFile -af "adelay=10000|10000" $TEMP_FILE
+
+ffmpeg-normalize $TEMP_FILE -o $PADDED_FILE -c:a libmp3lame
+
+ffmpeg -i $PADDED_FILE -ss 00:00:10.000 -acodec copy $inputFile -y
+
+cleanup
+