New video transcoder (#27)

* New video transcoder

* Set a smaller max muxing size + logging tweaks

* No need to return an err since it wiill panic anyway

* Use a default encoder preset if one is not supplied

* Rename to NewTranscoder.  Add comments.

* Rename Bitrate to VideoBitrate. Config file changes required with this rename.

* Allow overrides of segment length. Allow offline stream to live in a single segment

* Append offline state video to existin HLS stream instead of overwriting because players do not like that

* Make properties private as they do not need to be exported

core/playlist/monitor.go

@@ -13,7 +13,6 @@ import (
 	"github.com/radovskyb/watcher"
 
 	"github.com/gabek/owncast/config"
-	"github.com/gabek/owncast/core/ffmpeg"
 	"github.com/gabek/owncast/models"
 	"github.com/gabek/owncast/utils"
 )
@@ -159,5 +158,5 @@ func updateVariantPlaylist(fullPath string) error {
 
 	playlistString = _storage.GenerateRemotePlaylist(playlistString, variant)
 
-	return ffmpeg.WritePlaylist(playlistString, path.Join(config.Config.PublicHLSPath, relativePath))
+	return WritePlaylist(playlistString, path.Join(config.Config.PublicHLSPath, relativePath))
 }

core/playlist/writer.go

@@ -0,0 +1,18 @@
+package playlist
+
+import "os"
+
+//WritePlaylist writes the playlist to disk
+func WritePlaylist(data string, filePath string) error {
+	f, err := os.Create(filePath)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	if _, err := f.WriteString(data); err != nil {
+		return err
+	}
+
+	return nil
+}