diff --git a/libavcodec/ffv1.h b/libavcodec/ffv1.h
index a3f3b30b49..e466aedbbe 100644
--- a/libavcodec/ffv1.h
+++ b/libavcodec/ffv1.h
@@ -77,6 +77,9 @@ typedef struct FFV1SliceContext {
     int slice_y;
 
     int run_index;
+    int slice_coding_mode;
+    int slice_rct_by_coef;
+    int slice_rct_ry_coef;
 
     PutBitContext pb;
 } FFV1SliceContext;
@@ -130,9 +133,6 @@ typedef struct FFV1Context {
     int num_v_slices;
     int num_h_slices;
     int slice_reset_contexts;
-    int slice_coding_mode;
-    int slice_rct_by_coef;
-    int slice_rct_ry_coef;
 
     FFV1SliceContext *slices;
 } FFV1Context;
diff --git a/libavcodec/ffv1dec.c b/libavcodec/ffv1dec.c
index 6d3db25279..8464697fd3 100644
--- a/libavcodec/ffv1dec.c
+++ b/libavcodec/ffv1dec.c
@@ -240,11 +240,11 @@ static int decode_slice_header(const FFV1Context *f, FFV1Context *fs,
 
     if (fs->version > 3) {
         fs->slice_reset_contexts = get_rac(c, state);
-        fs->slice_coding_mode = get_symbol(c, state, 0);
-        if (fs->slice_coding_mode != 1) {
-            fs->slice_rct_by_coef = get_symbol(c, state, 0);
-            fs->slice_rct_ry_coef = get_symbol(c, state, 0);
-            if ((uint64_t)fs->slice_rct_by_coef + (uint64_t)fs->slice_rct_ry_coef > 4) {
+        sc->slice_coding_mode = get_symbol(c, state, 0);
+        if (sc->slice_coding_mode != 1) {
+            sc->slice_rct_by_coef = get_symbol(c, state, 0);
+            sc->slice_rct_ry_coef = get_symbol(c, state, 0);
+            if ((uint64_t)sc->slice_rct_by_coef + (uint64_t)sc->slice_rct_ry_coef > 4) {
                 av_log(f->avctx, AV_LOG_ERROR, "slice_rct_y_coef out of range\n");
                 return AVERROR_INVALIDDATA;
             }
@@ -294,8 +294,8 @@ static int decode_slice(AVCodecContext *c, void *arg)
         }
     }
 
-    fs->slice_rct_by_coef = 1;
-    fs->slice_rct_ry_coef = 1;
+    sc->slice_rct_by_coef = 1;
+    sc->slice_rct_ry_coef = 1;
 
     if (f->version > 2) {
         if (ff_ffv1_init_slice_state(f, fs) < 0)
diff --git a/libavcodec/ffv1dec_template.c b/libavcodec/ffv1dec_template.c
index 5c472168e2..dbcd4861ac 100644
--- a/libavcodec/ffv1dec_template.c
+++ b/libavcodec/ffv1dec_template.c
@@ -39,7 +39,7 @@ RENAME(decode_line)(FFV1Context *f,
     if (is_input_end(s, gb))
         return AVERROR_INVALIDDATA;
 
-    if (s->slice_coding_mode == 1) {
+    if (sc->slice_coding_mode == 1) {
         int i;
         for (x = 0; x < w; x++) {
             int v = 0;
@@ -162,10 +162,10 @@ static int RENAME(decode_rgb_frame)(FFV1Context *f,
 
             sample[p][1][-1]= sample[p][0][0  ];
             sample[p][0][ w]= sample[p][0][w-1];
-            if (lbd && s->slice_coding_mode == 0)
+            if (lbd && sc->slice_coding_mode == 0)
                 ret = RENAME(decode_line)(f, s, sc, gb, w, sample[p], (p + 1)/2, 9);
             else
-                ret = RENAME(decode_line)(f, s, sc, gb, w, sample[p], (p + 1)/2, bits + (s->slice_coding_mode != 1));
+                ret = RENAME(decode_line)(f, s, sc, gb, w, sample[p], (p + 1)/2, bits + (sc->slice_coding_mode != 1));
             if (ret < 0)
                 return ret;
         }
@@ -175,10 +175,10 @@ static int RENAME(decode_rgb_frame)(FFV1Context *f,
             int r = sample[2][1][x];
             int a = sample[3][1][x];
 
-            if (s->slice_coding_mode != 1) {
+            if (sc->slice_coding_mode != 1) {
                 b -= offset;
                 r -= offset;
-                g -= (b * s->slice_rct_by_coef + r * s->slice_rct_ry_coef) >> 2;
+                g -= (b * sc->slice_rct_by_coef + r * sc->slice_rct_ry_coef) >> 2;
                 b += g;
                 r += g;
             }
diff --git a/libavcodec/ffv1enc.c b/libavcodec/ffv1enc.c
index d334220e13..fb373b598b 100644
--- a/libavcodec/ffv1enc.c
+++ b/libavcodec/ffv1enc.c
@@ -926,13 +926,13 @@ static void encode_slice_header(FFV1Context *f, FFV1Context *fs,
     put_symbol(c, state, f->cur_enc_frame->sample_aspect_ratio.num, 0);
     put_symbol(c, state, f->cur_enc_frame->sample_aspect_ratio.den, 0);
     if (f->version > 3) {
-        put_rac(c, state, fs->slice_coding_mode == 1);
-        if (fs->slice_coding_mode == 1)
+        put_rac(c, state, sc->slice_coding_mode == 1);
+        if (sc->slice_coding_mode == 1)
             ff_ffv1_clear_slice_state(f, fs);
-        put_symbol(c, state, fs->slice_coding_mode, 0);
-        if (fs->slice_coding_mode != 1) {
-            put_symbol(c, state, fs->slice_rct_by_coef, 0);
-            put_symbol(c, state, fs->slice_rct_ry_coef, 0);
+        put_symbol(c, state, sc->slice_coding_mode, 0);
+        if (sc->slice_coding_mode != 1) {
+            put_symbol(c, state, sc->slice_rct_by_coef, 0);
+            put_symbol(c, state, sc->slice_rct_ry_coef, 0);
         }
     }
 }
@@ -1016,8 +1016,8 @@ static void choose_rct_params(FFV1Context *fs, FFV1SliceContext *sc,
             best = i;
     }
 
-    fs->slice_rct_by_coef = rct_y_coeff[best][1];
-    fs->slice_rct_ry_coef = rct_y_coeff[best][0];
+    sc->slice_rct_by_coef = rct_y_coeff[best][1];
+    sc->slice_rct_ry_coef = rct_y_coeff[best][0];
 }
 
 static int encode_slice(AVCodecContext *c, void *arg)
@@ -1039,12 +1039,12 @@ static int encode_slice(AVCodecContext *c, void *arg)
                                 p->data[2] ? p->data[2] + ps*x + y*p->linesize[2] : NULL,
                                 p->data[3] ? p->data[3] + ps*x + y*p->linesize[3] : NULL};
 
-    fs->slice_coding_mode = 0;
+    sc->slice_coding_mode = 0;
     if (f->version > 3) {
         choose_rct_params(fs, sc, planes, p->linesize, width, height);
     } else {
-        fs->slice_rct_by_coef = 1;
-        fs->slice_rct_ry_coef = 1;
+        sc->slice_rct_by_coef = 1;
+        sc->slice_rct_ry_coef = 1;
     }
 
 retry:
@@ -1084,13 +1084,13 @@ retry:
     }
 
     if (ret < 0) {
-        av_assert0(fs->slice_coding_mode == 0);
+        av_assert0(sc->slice_coding_mode == 0);
         if (fs->version < 4 || !fs->ac) {
             av_log(c, AV_LOG_ERROR, "Buffer too small\n");
             return ret;
         }
         av_log(c, AV_LOG_DEBUG, "Coding slice as PCM\n");
-        fs->slice_coding_mode = 1;
+        sc->slice_coding_mode = 1;
         fs->c = c_bak;
         goto retry;
     }
diff --git a/libavcodec/ffv1enc_template.c b/libavcodec/ffv1enc_template.c
index 0f47a0b424..29b50637f4 100644
--- a/libavcodec/ffv1enc_template.c
+++ b/libavcodec/ffv1enc_template.c
@@ -46,7 +46,7 @@ RENAME(encode_line)(FFV1Context *f,
         }
     }
 
-    if (s->slice_coding_mode == 1) {
+    if (sc->slice_coding_mode == 1) {
         for (x = 0; x < w; x++) {
             int i;
             int v = sample[0][x];
@@ -178,10 +178,10 @@ static int RENAME(encode_rgb_frame)(FFV1Context *f,
                 r = *((const uint16_t *)(src[2] + x*2 + stride[2]*y));
             }
 
-            if (s->slice_coding_mode != 1) {
+            if (sc->slice_coding_mode != 1) {
                 b -= g;
                 r -= g;
-                g += (b * s->slice_rct_by_coef + r * s->slice_rct_ry_coef) >> 2;
+                g += (b * sc->slice_rct_by_coef + r * sc->slice_rct_ry_coef) >> 2;
                 b += offset;
                 r += offset;
             }
@@ -195,10 +195,10 @@ static int RENAME(encode_rgb_frame)(FFV1Context *f,
             int ret;
             sample[p][0][-1] = sample[p][1][0  ];
             sample[p][1][ w] = sample[p][1][w-1];
-            if (lbd && s->slice_coding_mode == 0)
+            if (lbd && sc->slice_coding_mode == 0)
                 ret = RENAME(encode_line)(f, s, sc, w, sample[p], (p + 1) / 2, 9);
             else
-                ret = RENAME(encode_line)(f, s, sc, w, sample[p], (p + 1) / 2, bits + (s->slice_coding_mode != 1));
+                ret = RENAME(encode_line)(f, s, sc, w, sample[p], (p + 1) / 2, bits + (sc->slice_coding_mode != 1));
             if (ret < 0)
                 return ret;
         }