Possible fixes to xlib errors

[melted] / src / modules / sdl / consumer_sdl_preview.c

diff --git a/src/modules/sdl/consumer_sdl_preview.c b/src/modules/sdl/consumer_sdl_preview.c
index cfb6c0e..cb2e33c 100644 (file)
--- a/src/modules/sdl/consumer_sdl_preview.c
+++ b/src/modules/sdl/consumer_sdl_preview.c
@@ -178,6 +178,7 @@ static void *consumer_thread( void *arg )
        // internal intialization
        int first = 1;
        mlt_frame frame = NULL;
+       int last_position = -1;
 
        // properties
        mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
@@ -256,6 +257,18 @@ static void *consumer_thread( void *arg )
                        // Make sure the recipient knows that this frame isn't really rendered
                        mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 0 );
 
+                       // Optimisation to reduce latency
+                       if ( speed == 1.0 )
+                       {
+                               if ( last_position != -1 && last_position + 1 != mlt_frame_get_position( frame ) )
+                                       mlt_consumer_purge( this->play );
+                               last_position = mlt_frame_get_position( frame );
+                       }
+                       else
+                       {
+                               last_position = -1;
+                       }
+
                        // If we're not the first frame and both consumers are stopped, then stop ourselves
                        if ( !first && mlt_consumer_is_stopped( this->play ) && mlt_consumer_is_stopped( this->still ) )
                        {