Improve playback, preroll and TV experience

server/internal/emby/device_profile.go

@@ -53,6 +53,27 @@ func androidTVDeviceProfile(capabilities PlaybackCapabilities) map[string]any {
 	}
 }
 
+// forceH264TranscodeProfile turns decoder recovery into an actual codec change. Merely
+// removing DirectPlayProfiles is insufficient: Emby may otherwise stream-copy HEVC into
+// the ordinary HLS transcoding profile and hand the failing decoder the same video again.
+func forceH264TranscodeProfile(profile map[string]any) {
+	profile["DirectPlayProfiles"] = []map[string]string{}
+	profile["TranscodingProfiles"] = []map[string]string{
+		{
+			"Container": "ts", "VideoCodec": "h264", "AudioCodec": "aac",
+			"Protocol": "hls", "Type": "Video", "Context": "Streaming",
+		},
+	}
+	profiles, _ := profile["CodecProfiles"].([]map[string]any)
+	h264Profiles := make([]map[string]any, 0, len(profiles))
+	for _, codecProfile := range profiles {
+		if codec, _ := codecProfile["Codec"].(string); codec == "h264" {
+			h264Profiles = append(h264Profiles, codecProfile)
+		}
+	}
+	profile["CodecProfiles"] = h264Profiles
+}
+
 func androidTVSubtitleProfiles() []map[string]string {
 	return []map[string]string{
 		{"Format": "srt", "Method": "External"},