demux: adaptative: fix regression if pcr is first set alone

modules/demux/adaptative/Streams.cpp

@@ -276,7 +276,7 @@ void Stream::prune()
 AbstractStreamOutput::AbstractStreamOutput(demux_t *demux, const StreamFormat &format_)
 {
     realdemux = demux;
-    pcr = VLC_TS_0;
+    pcr = VLC_TS_INVALID;
     group = 0;
     format = format_;
 }

modules/demux/dash/dash.cpp

@@ -190,8 +190,9 @@ static int Demux(demux_t *p_demux)
         {
             return VLC_DEMUXER_EOF;
         }
-        mtime_t i_dts = p_sys->p_dashManager->getFirstDTS();
-        p_sys->i_nzpcr = i_dts;
+        p_sys->i_nzpcr = p_sys->p_dashManager->getFirstDTS();
+        if(p_sys->i_nzpcr == VLC_TS_INVALID)
+            p_sys->i_nzpcr = p_sys->p_dashManager->getPCR();
     }
 
     Stream::status status =

modules/demux/hls/hls.cpp

@@ -227,8 +227,9 @@ static int Demux(demux_t *p_demux)
         {
             return VLC_DEMUXER_EOF;
         }
-        mtime_t i_dts = p_sys->p_manager->getFirstDTS();
-        p_sys->i_nzpcr = i_dts;
+        p_sys->i_nzpcr = p_sys->p_manager->getFirstDTS();
+        if(p_sys->i_nzpcr == VLC_TS_INVALID)
+            p_sys->i_nzpcr = p_sys->p_manager->getPCR();
     }
 
     Stream::status status =