diff --git a/libavcodec/dnxhdenc.c b/libavcodec/dnxhdenc.c
index c637415187..b85027b6d2 100644
--- a/libavcodec/dnxhdenc.c
+++ b/libavcodec/dnxhdenc.c
@@ -203,14 +203,14 @@ static av_cold int dnxhd_init_qmat(DNXHDEncContext *ctx, int lbias, int cbias)
             int j = ctx->m.dsp.idct_permutation[ff_zigzag_direct[i]];
             weight_matrix[j] = ctx->cid_table->luma_weight[i];
         }
-        ff_convert_matrix(&ctx->m.dsp, ctx->qmatrix_l, ctx->qmatrix_l16,
+        ff_convert_matrix(&ctx->m, ctx->qmatrix_l, ctx->qmatrix_l16,
                           weight_matrix, ctx->m.intra_quant_bias, 1,
                           ctx->m.avctx->qmax, 1);
         for (i = 1; i < 64; i++) {
             int j = ctx->m.dsp.idct_permutation[ff_zigzag_direct[i]];
             weight_matrix[j] = ctx->cid_table->chroma_weight[i];
         }
-        ff_convert_matrix(&ctx->m.dsp, ctx->qmatrix_c, ctx->qmatrix_c16,
+        ff_convert_matrix(&ctx->m, ctx->qmatrix_c, ctx->qmatrix_c16,
                           weight_matrix, ctx->m.intra_quant_bias, 1,
                           ctx->m.avctx->qmax, 1);
 
diff --git a/libavcodec/mpegvideo.h b/libavcodec/mpegvideo.h
index 6fe6a4345b..191dac0d3a 100644
--- a/libavcodec/mpegvideo.h
+++ b/libavcodec/mpegvideo.h
@@ -726,7 +726,7 @@ int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src
 void ff_set_qscale(MpegEncContext * s, int qscale);
 
 int ff_dct_common_init(MpegEncContext *s);
-void ff_convert_matrix(DSPContext *dsp, int (*qmat)[64], uint16_t (*qmat16)[2][64],
+void ff_convert_matrix(MpegEncContext *s, int (*qmat)[64], uint16_t (*qmat16)[2][64],
                        const uint16_t *quant_matrix, int bias, int qmin, int qmax, int intra);
 int ff_dct_quantize_c(MpegEncContext *s, int16_t *block, int n, int qscale, int *overflow);
 
diff --git a/libavcodec/mpegvideo_enc.c b/libavcodec/mpegvideo_enc.c
index 28ab272e14..8985030d70 100644
--- a/libavcodec/mpegvideo_enc.c
+++ b/libavcodec/mpegvideo_enc.c
@@ -70,11 +70,12 @@ const AVOption ff_mpv_generic_options[] = {
     { NULL },
 };
 
-void ff_convert_matrix(DSPContext *dsp, int (*qmat)[64],
+void ff_convert_matrix(MpegEncContext *s, int (*qmat)[64],
                        uint16_t (*qmat16)[2][64],
                        const uint16_t *quant_matrix,
                        int bias, int qmin, int qmax, int intra)
 {
+    DSPContext *dsp = &s->dsp;
     int qscale;
     int shift = 0;
 
@@ -775,10 +776,10 @@ av_cold int ff_MPV_encode_init(AVCodecContext *avctx)
     /* precompute matrix */
     /* for mjpeg, we do include qscale in the matrix */
     if (s->out_format != FMT_MJPEG) {
-        ff_convert_matrix(&s->dsp, s->q_intra_matrix, s->q_intra_matrix16,
+        ff_convert_matrix(s, s->q_intra_matrix, s->q_intra_matrix16,
                           s->intra_matrix, s->intra_quant_bias, avctx->qmin,
                           31, 1);
-        ff_convert_matrix(&s->dsp, s->q_inter_matrix, s->q_inter_matrix16,
+        ff_convert_matrix(s, s->q_inter_matrix, s->q_inter_matrix16,
                           s->inter_matrix, s->inter_quant_bias, avctx->qmin,
                           31, 0);
     }
@@ -3365,7 +3366,7 @@ static int encode_picture(MpegEncContext *s, int picture_number)
         s->y_dc_scale_table=
         s->c_dc_scale_table= ff_mpeg2_dc_scale_table[s->intra_dc_precision];
         s->intra_matrix[0] = ff_mpeg2_dc_scale_table[s->intra_dc_precision][8];
-        ff_convert_matrix(&s->dsp, s->q_intra_matrix, s->q_intra_matrix16,
+        ff_convert_matrix(s, s->q_intra_matrix, s->q_intra_matrix16,
                        s->intra_matrix, s->intra_quant_bias, 8, 8, 1);
         s->qscale= 8;
     }