Redo everything in the MR

src/components/video_attachment/video_attachment.js

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+
+const VideoAttachment = {
+  props: ['attachment', 'controls'],
+  data () {
+    return {
+      loopVideo: this.$store.state.config.loopVideo
+    }
+  },
+  methods: {
+    onVideoDataLoad (e) {
+      const target = e.srcElement || e.target
+      if (typeof target.webkitAudioDecodedByteCount !== 'undefined') {
+        // non-zero if video has audio track
+        if (target.webkitAudioDecodedByteCount > 0) {
+          this.loopVideo = this.loopVideo && !this.$store.state.config.loopVideoSilentOnly
+        }
+      } else if (typeof target.mozHasAudio !== 'undefined') {
+        // true if video has audio track
+        if (target.mozHasAudio) {
+          this.loopVideo = this.loopVideo && !this.$store.state.config.loopVideoSilentOnly
+        }
+      } else if (typeof target.audioTracks !== 'undefined') {
+        if (target.audioTracks.length > 0) {
+          this.loopVideo = this.loopVideo && !this.$store.state.config.loopVideoSilentOnly
+        }
+      }
+    }
+  }
+}
+
+export default VideoAttachment

src/components/video_attachment/video_attachment.vue

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+<template>
+  <video class="video"
+    @loadeddata="onVideoDataLoad"
+    :src="attachment.url"
+    :loop="loopVideo"
+    :controls="controls"
+    playsinline
+  />
+</template>
+
+<script src="./video_attachment.js"></script>