Transcode stream refactor (#609)

* Remove forceMkv and forceHEVC
* Add HLS support and refactor
* Add new streaming endpoints

pkg/ffmpeg/hls.go

@@ -0,0 +1,42 @@
+package ffmpeg
+
+import (
+	"fmt"
+	"io"
+	"strings"
+)
+
+const hlsSegmentLength = 10.0
+
+func WriteHLSPlaylist(probeResult VideoFile, baseUrl string, w io.Writer) {
+	fmt.Fprint(w, "#EXTM3U\n")
+	fmt.Fprint(w, "#EXT-X-VERSION:3\n")
+	fmt.Fprint(w, "#EXT-X-MEDIA-SEQUENCE:0\n")
+	fmt.Fprint(w, "#EXT-X-ALLOW-CACHE:YES\n")
+	fmt.Fprintf(w, "#EXT-X-TARGETDURATION:%d\n", int(hlsSegmentLength))
+	fmt.Fprint(w, "#EXT-X-PLAYLIST-TYPE:VOD\n")
+
+	duration := probeResult.Duration
+
+	leftover := duration
+	upTo := 0.0
+
+	tsURL := baseUrl
+	i := strings.LastIndex(baseUrl, ".m3u8")
+	tsURL = baseUrl[0:i] + ".ts"
+
+	for leftover > 0 {
+		thisLength := hlsSegmentLength
+		if leftover < thisLength {
+			thisLength = leftover
+		}
+
+		fmt.Fprintf(w, "#EXTINF: %f,\n", thisLength)
+		fmt.Fprintf(w, "%s?start=%f\n", tsURL, upTo)
+
+		leftover -= thisLength
+		upTo += thisLength
+	}
+
+	fmt.Fprint(w, "#EXT-X-ENDLIST\n")
+}