@@ -250,8 +250,8 @@ static void lag_pred_line(LagarithContext *l, uint8_t *buf,

     if (!line) {

         /* Left prediction only for first line */

-        L = l->dsp.add_hfyu_left_prediction(buf + 1, buf + 1,

-                                            width - 1, buf[0]);

+        L = l->dsp.add_hfyu_left_prediction(buf, buf,

+                                            width, 0);

     } else {

         /* Left pixel is actually prev_row[width] */

         L = buf[width - stride - 1];

@@ -277,11 +277,12 @@ static void lag_pred_line_yuy2(LagarithContext *l, uint8_t *buf,

     int L, TL;

     if (!line) {

-        if (is_luma) {

-            buf++;

-            width--;

-        }

-        l->dsp.add_hfyu_left_prediction(buf + 1, buf + 1, width - 1, buf[0]);

+        L= buf[0];

+        if (is_luma)

+            buf[0] = 0;

+        l->dsp.add_hfyu_left_prediction(buf, buf, width, 0);

+        if (is_luma)

+            buf[0] = L;

         return;

     }

     if (line == 1) {

@@ -294,14 +295,17 @@ static void lag_pred_line_yuy2(LagarithContext *l, uint8_t *buf,

             L += buf[i];

             buf[i] = L;

         }

-        buf   += HEAD;

-        width -= HEAD;

+        for (; i<width; i++) {

+            L     = mid_pred(L&0xFF, buf[i-stride], (L + buf[i-stride] - TL)&0xFF) + buf[i];

+            TL    = buf[i-stride];

+            buf[i]= L;

+        }

     } else {

         TL = buf[width - (2 * stride) - 1];

         L  = buf[width - stride - 1];

+        l->dsp.add_hfyu_median_prediction(buf, buf - stride, buf, width,

+                                        &L, &TL);

     }

-    l->dsp.add_hfyu_median_prediction(buf, buf - stride, buf, width,

-                                      &L, &TL);

 }

 static int lag_decode_line(LagarithContext *l, lag_rac *rac,