@@ -405,7 +405,8 @@ static int encode_plane(FFV1Context *s, uint8_t *src, int w, int h,

     return 0;

 }

-static int encode_rgb_frame(FFV1Context *s, uint8_t *src[3], int w, int h, const int stride[3])

+static int encode_rgb_frame(FFV1Context *s, const uint8_t *src[3],

+                             int w, int h, const int stride[3])

 {

     int x, y, p, i;

     const int ring_size = s->avctx->context_model ? 3 : 2;

@@ -427,15 +428,15 @@ static int encode_rgb_frame(FFV1Context *s, uint8_t *src[3], int w, int h, const

         for (x = 0; x < w; x++) {

             int b, g, r, av_uninit(a);

             if (lbd) {

-                unsigned v = *((uint32_t*)(src[0] + x*4 + stride[0]*y));

+                unsigned v = *((const uint32_t*)(src[0] + x*4 + stride[0]*y));

                 b =  v        & 0xFF;

                 g = (v >>  8) & 0xFF;

                 r = (v >> 16) & 0xFF;

                 a =  v >> 24;

             } else {

-                b = *((uint16_t*)(src[0] + x*2 + stride[0]*y));

-                g = *((uint16_t*)(src[1] + x*2 + stride[1]*y));

-                r = *((uint16_t*)(src[2] + x*2 + stride[2]*y));

+                b = *((const uint16_t *)(src[0] + x*2 + stride[0]*y));

+                g = *((const uint16_t *)(src[1] + x*2 + stride[1]*y));

+                r = *((const uint16_t *)(src[2] + x*2 + stride[2]*y));

             }

             if (s->slice_coding_mode != 1) {

@@ -1110,9 +1111,9 @@ static int encode_slice(AVCodecContext *c, void *arg)

     const int ps     = av_pix_fmt_desc_get(c->pix_fmt)->comp[0].step_minus1 + 1;

     int ret;

     RangeCoder c_bak = fs->c;

-    uint8_t *planes[3] = {p->data[0] + ps*x + y*p->linesize[0],

-                          p->data[1] + ps*x + y*p->linesize[1],

-                          p->data[2] + ps*x + y*p->linesize[2]};

+    const uint8_t *planes[3] = {p->data[0] + ps*x + y*p->linesize[0],

+                                p->data[1] + ps*x + y*p->linesize[1],

+                                p->data[2] + ps*x + y*p->linesize[2]};

     fs->slice_coding_mode = 0;

     if (f->version > 3) {