diff --git a/plugins/extensions/animationrenderer/AnimationRenderer.h b/plugins/extensions/animationrenderer/AnimationRenderer.h
--- a/plugins/extensions/animationrenderer/AnimationRenderer.h
+++ b/plugins/extensions/animationrenderer/AnimationRenderer.h
@@ -31,7 +31,23 @@
 
 private Q_SLOTS:
 
+    /**
+     * @brief slotRenderAnimation
+     *
+     * Triggered from the renderanimation action. This calls a dialog
+     * to set the animation settings and then takes that to call the appropriate exporter,
+     * this can be a frame exporter, or it is a KisVideoExport object as defined in
+     *  plugins/extensions/impex.
+     */
     void slotRenderAnimation();
+    /**
+     * @brief slotRenderSequenceAgain
+     *
+     * triggered from the renderanimationagain action. This does not call a dialog, but
+     * instead uses the settings to set the animation settings and then takes that to
+     * call the appropriate exporter, this can be a frame exporter, or it is a
+     * KisVideoExport object as defined in plugins/extensions/impex.
+     */
     void slotRenderSequenceAgain();
 
 };
diff --git a/plugins/extensions/animationrenderer/AnimationRenderer.cpp b/plugins/extensions/animationrenderer/AnimationRenderer.cpp
--- a/plugins/extensions/animationrenderer/AnimationRenderer.cpp
+++ b/plugins/extensions/animationrenderer/AnimationRenderer.cpp
@@ -148,6 +148,7 @@
                 KisImportExportFilter::ConversionStatus res;
                 if (!fi.open(QIODevice::WriteOnly)) {
                     qWarning() << "Could not open" << fi.fileName() << "for writing!";
+                    doc->setErrorMessage(i18n("Could not open %1 for writing!", fi.fileName()));
                     res = KisImportExportFilter::CreationError;
                 }
                 else {
diff --git a/plugins/impex/video/kis_video_export.h b/plugins/impex/video/kis_video_export.h
--- a/plugins/impex/video/kis_video_export.h
+++ b/plugins/impex/video/kis_video_export.h
@@ -23,7 +23,12 @@
 #include <QVariant>
 
 #include <KisImportExportFilter.h>
-
+/**
+ * @brief The KisVideoExport class this controls the export
+ * plugin for video file export. This class deals with the plugin parts.
+ * Video saver deals with taking all the parts(document, ffmpeg, config)
+ * and getting ffmpeg to take the config and document to create a video file.
+ */
 class KisVideoExport : public KisImportExportFilter
 {
     Q_OBJECT
diff --git a/plugins/impex/video/kis_video_export.cpp b/plugins/impex/video/kis_video_export.cpp
--- a/plugins/impex/video/kis_video_export.cpp
+++ b/plugins/impex/video/kis_video_export.cpp
@@ -73,6 +73,7 @@
             else {
                 qWarning() << warningMessage;
             }
+            document->setErrorMessage(warningMessage);
             return KisImportExportFilter::UsageError;
         }
     }
diff --git a/plugins/impex/video/video_saver.h b/plugins/impex/video/video_saver.h
--- a/plugins/impex/video/video_saver.h
+++ b/plugins/impex/video/video_saver.h
@@ -38,10 +38,29 @@
 
     Q_OBJECT
 public:
+    /**
+     * @brief VideoSaver
+     * This is the object that takes an animation document and config and tells ffmpeg
+     * to render it. Log files are generated here too.
+     * @param doc the document to use for rendering.
+     * @param ffmpegPath the path to the ffmpeg executable.
+     * @param batchMode whether Krita is in batchmde and we can thus not show gui widgets.
+     */
     VideoSaver(KisDocument* doc, const QString &ffmpegPath, bool batchMode);
     ~VideoSaver() override;
 
+    /**
+     * @brief image
+     * @return get the image used by this exporter.
+     */
     KisImageSP image();
+    /**
+     * @brief encode the main encoding function.
+     * This in turn calls runFFMpeg, which is a private function inside this class.
+     * @param filename the filename to which to render the animation.
+     * @param configuration the configuration
+     * @return whether it is succesful or had another failure.
+     */
     KisImageBuilder_Result encode(const QString &filename, KisPropertiesConfigurationSP configuration);
 
     bool hasFFMpeg() const;
diff --git a/plugins/impex/video/video_saver.cpp b/plugins/impex/video/video_saver.cpp
--- a/plugins/impex/video/video_saver.cpp
+++ b/plugins/impex/video/video_saver.cpp
@@ -217,6 +217,7 @@
     if (m_ffmpegPath.isEmpty()) {
         m_ffmpegPath = configuration->getString("ffmpeg_path");
         if (!QFileInfo(m_ffmpegPath).exists()) {
+            m_doc->setErrorMessage(i18n("ffmpeg could not be found at %1", m_ffmpegPath));
             return KisImageBuilder_RESULT_FAILURE;
         }
     }