Clearly state that a clip length is mesured in frames

src/Gui/timeline/AbstractGraphicsMediaItem.cpp

@@ -42,7 +42,7 @@ AbstractGraphicsMediaItem::AbstractGraphicsMediaItem( Clip* clip ) :
 {
     m_clipHelper = new ClipHelper( clip );
     // Adjust the width
-    setWidth( clip->length() );
+    setWidth( clip->nbFrames() );
     // Automatically adjust future changes
     connect( m_clipHelper, SIGNAL( lengthUpdated() ), this, SLOT( adjustLength() ) );
     connect( clip, SIGNAL( unloaded( Clip* ) ),

src/Media/Clip.cpp

@@ -92,9 +92,9 @@ Clip::getMedia() const
 }
 
 qint64
-Clip::length() const
+Clip::nbFrames() const
 {
-    return m_length;
+    return m_nbFrames;
 }
 
 qint64
@@ -109,8 +109,8 @@ Clip::computeLength()
     float   fps = m_media->source()->fps();
     if ( fps < 0.1f )
         fps = Clip::DefaultFPS;
-    m_length = m_end - m_begin;
-    m_lengthSeconds = qRound64( (float)m_length / fps );
+    m_nbFrames = m_end - m_begin;
+    m_lengthSeconds = qRound64( (float)m_nbFrames / fps );
 }
 
 const QStringList&

src/Media/Clip.h

@@ -83,7 +83,7 @@ class   Clip : public QObject
         /**
             \return         Returns the clip length in frame.
         */
-        qint64              length() const;
+        qint64              nbFrames() const;
 
         /**
             \return         Returns the clip length in seconds.
@@ -161,7 +161,7 @@ class   Clip : public QObject
         /**
          *  \brief  The length in frames
          */
-        qint64              m_length;
+        qint64              m_nbFrames;
         /**
          *  \brief  The length in seconds (Be carreful, VLC uses MILLIseconds)
          */

src/Renderer/ClipRenderer.cpp

@@ -66,7 +66,7 @@ ClipRenderer::setClip( Clip* clip )
         return ;
     }
     m_selectedClip = clip;
-    if ( clip->length() == 0 )
+    if ( clip->nbFrames() == 0 )
         return ;
     updateInfos( clip );
 }
@@ -85,7 +85,7 @@ ClipRenderer::updateInfos( Clip* clip )
 void
 ClipRenderer::startPreview()
 {
-    if ( m_selectedClip == NULL || m_selectedClip->length() == 0 )
+    if ( m_selectedClip == NULL || m_selectedClip->nbFrames() == 0 )
         return ;
     updateInfos( m_selectedClip );