diff --git a/src/slic3r/GUI/AVVideoDecoder.cpp b/src/slic3r/GUI/AVVideoDecoder.cpp
index a56579cca..184804054 100644
--- a/src/slic3r/GUI/AVVideoDecoder.cpp
+++ b/src/slic3r/GUI/AVVideoDecoder.cpp
@@ -76,8 +76,13 @@ bool AVVideoDecoder::toWxImage(wxImage &image, wxSize const &size2)
     if (!size1.IsFullySpecified())
         size1 = {frame_->width, frame_->height };
     auto size = size1;
-    if (size.GetWidth() & 0x0f)
+    if (size.GetWidth() & 0x0f) {
         size.SetWidth((size.GetWidth() & ~0x0f) + 0x10);
+        if (size.GetWidth() != width_) {
+            std::fill(bits_.begin(), bits_.end(), 0);
+            width_ = size.GetWidth();
+        }
+    }
     AVPixelFormat wxFmt = AV_PIX_FMT_RGB24;
     sws_ctx_   = sws_getCachedContext(sws_ctx_,
                                     frame_->width, frame_->height, AVPixelFormat(frame_->format),
@@ -112,8 +117,13 @@ bool AVVideoDecoder::toWxBitmap(wxBitmap &bitmap, wxSize const &size2)
     if (!size1.IsFullySpecified())
         size1 = {frame_->width, frame_->height };
     auto size = size1;
-    if (size.GetWidth() & 0x0f)
+    if (size.GetWidth() & 0x0f) {
         size.SetWidth((size.GetWidth() & ~0x0f) + 0x10);
+        if (size.GetWidth() != width_) {
+            std::fill(bits_.begin(), bits_.end(), 0);
+            width_ = size.GetWidth();
+        }
+    }
     AVPixelFormat wxFmt = AV_PIX_FMT_RGB32;
     sws_ctx_ = sws_getCachedContext(sws_ctx_,
                                     frame_->width, frame_->height, AVPixelFormat(frame_->format),
diff --git a/src/slic3r/GUI/AVVideoDecoder.hpp b/src/slic3r/GUI/AVVideoDecoder.hpp
index 99a7349e5..239352aea 100644
--- a/src/slic3r/GUI/AVVideoDecoder.hpp
+++ b/src/slic3r/GUI/AVVideoDecoder.hpp
@@ -34,6 +34,7 @@ private:
     AVFrame *       frame_     = nullptr;
     SwsContext *    sws_ctx_   = nullptr;
     bool got_frame_ = false;
+    int width_ { 0 }; // scale result width
     std::vector<uint8_t> bits_;
 };