diff --git a/src/ImageReader.cpp b/src/ImageReader.cpp
index b719ee3d..a37ddf71 100644
--- a/src/ImageReader.cpp
+++ b/src/ImageReader.cpp
@@ -82,7 +82,7 @@ void ImageReader::Open()
 		info.height = image->size().height();
 		info.pixel_ratio.num = 1;
 		info.pixel_ratio.den = 1;
-		info.duration = 60 * 60 * 24; // 24 hour duration
+		info.duration = 60 * 60 * 1;  // 1 hour duration
 		info.fps.num = 30;
 		info.fps.den = 1;
 		info.video_timebase.num = 1;
diff --git a/src/QtImageReader.cpp b/src/QtImageReader.cpp
index 97a0b24f..a8bb781e 100644
--- a/src/QtImageReader.cpp
+++ b/src/QtImageReader.cpp
@@ -123,7 +123,7 @@ void QtImageReader::Open()
 		info.height = image->height();
 		info.pixel_ratio.num = 1;
 		info.pixel_ratio.den = 1;
-		info.duration = 60 * 60 * 24; // 24 hour duration
+		info.duration = 60 * 60 * 1;  // 1 hour duration
 		info.fps.num = 30;
 		info.fps.den = 1;
 		info.video_timebase.num = 1;
diff --git a/src/TextReader.cpp b/src/TextReader.cpp
index e92ec285..0dd7f448 100644
--- a/src/TextReader.cpp
+++ b/src/TextReader.cpp
@@ -127,7 +127,7 @@ void TextReader::Open()
 		info.height = image->size().height();
 		info.pixel_ratio.num = 1;
 		info.pixel_ratio.den = 1;
-		info.duration = 60 * 60 * 24; // 24 hour duration
+		info.duration = 60 * 60 * 1;  // 1 hour duration
 		info.fps.num = 30;
 		info.fps.den = 1;
 		info.video_timebase.num = 1;