ditching ffmpeg, acceptable image size

Dockerfile

@@ -1,3 +1,4 @@
+# building the go program
 FROM golang:1.15.6-alpine AS builder
 RUN apk add --no-cache git
 ENV GO111MODULE=on \
@@ -12,12 +13,13 @@ COPY main.go ./
 COPY core ./core/
 RUN go build -o gogodiscordo
 
-
+# downloading mbrola voice
 FROM alpine as alpine_voices
 WORKDIR /tmp
 RUN wget --no-check-certificate https://github.com/numediart/MBROLA-voices/archive/master.zip \
     && unzip master.zip && rm master.zip
 
+# final image
 FROM ubuntu:focal as ubuntu1
 
 SHELL ["/bin/bash", "-c"]
@@ -27,19 +29,17 @@ RUN set -ex;\
     apt install -y --no-install-recommends \
     mbrola \
     espeak-ng \
-    ffmpeg \
     ca-certificates \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*
 
+RUN mkdir -p /usr/share/mbrola/
+
 COPY --from=builder /src/gogodiscordo /app/
 COPY config.yaml /app/
-RUN mkdir -p /usr/share/mbrola/
 COPY --from=alpine_voices /tmp/MBROLA-voices-master/data/fr* /usr/share/mbrola/
 
 VOLUME ["/app"]
 
-RUN useradd -d /app appuser
-
 WORKDIR /app
 CMD ["./gogodiscordo"]

core/audio.go

@@ -42,8 +42,8 @@ func playSound(s *discordgo.Session, guildID, channelID string, audioBuffer []by
 
 func getAudioMessage(msg string) (filename string, out []byte) {
 	curr_time := time.Now().Unix()
-	filename = fmt.Sprintf("%d.ogg", curr_time)
-	var cmd_args string = fmt.Sprintf("espeak-ng -s 120 -v mb-fr2 -p 30 '%s' --stdout | ffmpeg -i - -c:a libopus -f ogg pipe:1 2>/dev/null",
+	filename = fmt.Sprintf("%d.wav", curr_time)
+	var cmd_args string = fmt.Sprintf("espeak-ng -s 120 -v mb-fr2 -p 30 '%s' --stdout",
 		maxString(msg, 300))
 	cmd := exec.Command("sh", "-c", cmd_args)
 	out, err := cmd.CombinedOutput()