diff --git a/plugins/prebuffer-mixin/src/main.ts b/plugins/prebuffer-mixin/src/main.ts
index 70f66635f..a9ada7f32 100644
--- a/plugins/prebuffer-mixin/src/main.ts
+++ b/plugins/prebuffer-mixin/src/main.ts
@@ -351,7 +351,12 @@ class PrebufferSession {
 
       const currentParser = parser.isDefault ? STRING_DEFAULT : parser.parser;
 
-      const choices = this.canUseRtmpParser(this.advertisedMediaStreamOptions)
+      const choices = this.mixin.streamSettings.storageSettings.values.synthenticStreams.includes(this.streamId)
+        ? [
+          FFMPEG_PARSER_TCP,
+          FFMPEG_PARSER_UDP,
+        ]
+        : this.canUseRtmpParser(this.advertisedMediaStreamOptions)
         ? [
           STRING_DEFAULT,
           SCRYPTED_PARSER_TCP,
@@ -1405,6 +1410,7 @@ class PrebufferMixin extends SettingsMixinDeviceBase<VideoCamera> implements Vid
 
       session = new PrebufferSession(this, {
         id: synthetic,
+        container: 'rtsp',
       }, false, false);
       this.sessions.set(id, session);
       this.console.log('stream', synthetic, 'is synthetic and will be rebroadcast on demand.');
diff --git a/plugins/prebuffer-mixin/src/stream-settings.ts b/plugins/prebuffer-mixin/src/stream-settings.ts
index 52b19543f..b447f8659 100644
--- a/plugins/prebuffer-mixin/src/stream-settings.ts
+++ b/plugins/prebuffer-mixin/src/stream-settings.ts
@@ -227,7 +227,7 @@ export function createStreamSettings(device: MixinDeviceBase<VideoCamera>) {
                     hide: false,
                 };
 
-                if (msos?.length > 1) {
+                if (msos?.length > 1 || storageSettings.values.synthenticStreams.length > 0) {
                     return {
                         enabledStreams,
                         defaultStream: createStreamOptions(streamTypes.defaultStream, msos),