Increase the lookahead to 25 frames.

MLT can now handle larger lookaheads without adding parameter lag,
and larger lookahead means smoother playback, especially when we
go to a new transition or effect that needs new Movit shaders compiled.

diff --git a/src/renderer.cpp b/src/renderer.cpp
index 75cfa7e608f6e295d5a18268c84f1e2a443e0409..fb61b814e43d2f711e0aadc790a0106f60fa101f 100644 (file)
--- a/src/renderer.cpp
+++ b/src/renderer.cpp
@@ -280,7 +280,7 @@ void Render::buildConsumer(const QString &profileName)
                 m_mltConsumer->set("terminate_on_pause", 0);
                 m_mltConsumer->set("deinterlace_method", KdenliveSettings::mltdeinterlacer().toUtf8().constData());
                 m_mltConsumer->set("rescale", KdenliveSettings::mltinterpolation().toUtf8().constData());
-                m_mltConsumer->set("buffer", "1");
+                m_mltConsumer->set("buffer", "25");
                 m_mltConsumer->set("real_time", KdenliveSettings::mltthreads());
             }
             if (m_mltConsumer && m_mltConsumer->is_valid()) {
@@ -327,7 +327,7 @@ void Render::buildConsumer(const QString &profileName)
                 m_consumerThreadStartedEvent = m_mltConsumer->listen("consumer-thread-started", this, (mlt_listener) consumer_thread_started);
                 m_consumerThreadStoppedEvent = m_mltConsumer->listen("consumer-thread-stopped", this, (mlt_listener) consumer_thread_stopped);
             }
-            m_mltConsumer->set("buffer", "1");
+            m_mltConsumer->set("buffer", "25");
             m_showFrameEvent = m_mltConsumer->listen("consumer-frame-show", this, (mlt_listener) consumer_gl_frame_show);
         }
     } else {