--- ffmpeg-4.4/libavcodec/aaccoder.c.orig	2021-05-08 11:52:41.824074401 +0300
+++ ffmpeg-4.4/libavcodec/aaccoder.c	2021-05-08 11:55:06.868074410 +0300
@@ -800,7 +800,7 @@

                 for (sid_sf_boost = 0; sid_sf_boost < 4; sid_sf_boost++) {
                     float dist1 = 0.0f, dist2 = 0.0f;
-                    int B0 = 0, B1 = 0;
+                    int B0_ = 0, B1 = 0;
                     int minidx;
                     int mididx, sididx;
                     int midcb, sidcb;
@@ -862,12 +862,12 @@
                                                     sididx,
                                                     sidcb,
                                                     mslambda / (minthr * bmax), INFINITY, &b4, NULL, 0);
-                        B0 += b1+b2;
+                        B0_ += b1+b2;
                         B1 += b3+b4;
                         dist1 -= b1+b2;
                         dist2 -= b3+b4;
                     }
-                    cpe->ms_mask[w*16+g] = dist2 <= dist1 && B1 < B0;
+                    cpe->ms_mask[w*16+g] = dist2 <= dist1 && B1 < B0_;
                     if (cpe->ms_mask[w*16+g]) {
                         if (sce0->band_type[w*16+g] != NOISE_BT && sce1->band_type[w*16+g] != NOISE_BT) {
                             sce0->sf_idx[w*16+g] = mididx;
@@ -879,7 +879,7 @@
                             cpe->ms_mask[w*16+g] = 0;
                         }
                         break;
-                    } else if (B1 > B0) {
+                    } else if (B1 > B0_) {
                         /* More boost won't fix this */
                         break;
                     }