framework/mlt_playlist.c: check length before inserting blank, which fixes one frame...

[melted] / src / framework / mlt_playlist.c

diff --git a/src/framework/mlt_playlist.c b/src/framework/mlt_playlist.c
index 0847f39..27c4443 100644 (file)
--- a/src/framework/mlt_playlist.c
+++ b/src/framework/mlt_playlist.c
@@ -593,7 +593,10 @@ int mlt_playlist_append_io( mlt_playlist this, mlt_producer producer, mlt_positi
 int mlt_playlist_blank( mlt_playlist this, mlt_position length )
 {
        // Append to the virtual list
-       return mlt_playlist_virtual_append( this, &this->blank, 0, length );
+       if (length >= 0) 
+               return mlt_playlist_virtual_append( this, &this->blank, 0, length );
+       else 
+               return 1;
 }
 
 /** Insert a producer into the playlist.