diff --git a/Changelog b/Changelog
index 32f5ec4808..f9be9ed1be 100644
--- a/Changelog
+++ b/Changelog
@@ -11,6 +11,7 @@ version <next>:
 - RTP/mpegts muxer
 - VP8 in Ogg demuxing
 - OpenH264 encoder wrapper
+- Support DNx100 (960x720@8)
 
 
 version 11:
diff --git a/libavcodec/dnxhddata.c b/libavcodec/dnxhddata.c
index 0edaeec98a..b23e337705 100644
--- a/libavcodec/dnxhddata.c
+++ b/libavcodec/dnxhddata.c
@@ -231,6 +231,28 @@ static const uint8_t dnxhd_1256_chroma_weight[] = {
     34, 37, 39, 44, 51, 56, 61, 70,
 };
 
+static const uint8_t dnxhd_1258_luma_weight[] = {
+     0, 32, 36, 36,  40,  40, 55, 60,
+    34, 36, 37, 40,  41,  48, 57, 82,
+    35, 36, 41, 41,  46,  52, 73, 82,
+    37, 40, 42, 45,  50,  65, 80, 87,
+    39, 41, 44, 49,  62,  78, 88, 90,
+    41, 44, 49, 58,  73,  90, 95, 95,
+    43, 52, 55, 68,  90, 100, 97, 93,
+    52, 53, 71, 82, 107, 103, 99, 99,
+};
+
+static const uint8_t dnxhd_1258_chroma_weight[] = {
+     0, 32, 37,  38,  49,  53,  65,  66,
+    35, 37, 40,  49,  56,  64,  65,  82,
+    36, 42, 50,  56,  64,  67,  73,  85,
+    46, 50, 57,  63,  71,  72,  89,  87,
+    49, 58, 65,  72,  78,  88,  88,  90,
+    60, 64, 74,  81,  84,  90,  95, 134,
+    62, 74, 77,  80,  90, 114, 129, 125,
+    74, 74, 90, 100, 128, 125, 116, 116,
+};
+
 static const uint8_t dnxhd_1237_dc_codes[12] = {
     0, 12, 13, 1, 2, 3, 4, 5, 14, 30, 62, 63,
 };
@@ -1073,6 +1095,14 @@ static const uint8_t dnxhd_1252_ac_index_flag[257] = {
     1,
 };
 
+static const uint8_t dnxhd_1258_dc_codes[14] = {
+    0, 12, 13, 1, 2, 3, 4, 5, 14, 30, 62, 63, 0, 0,
+};
+
+static const uint8_t dnxhd_1258_dc_bits[14] = {
+    3, 4, 4, 3, 3, 3, 3, 3, 4, 5, 6, 6, 0, 0,
+};
+
 const CIDEntry ff_dnxhd_cid_table[] = {
     { 1235, 1920, 1080, 0, 917504, 917504, 6, 10,
       dnxhd_1235_luma_weight, dnxhd_1235_chroma_weight,
@@ -1151,6 +1181,13 @@ const CIDEntry ff_dnxhd_cid_table[] = {
       dnxhd_1235_1241_ac_run_flag, dnxhd_1235_1241_ac_index_flag,
       dnxhd_1235_1238_1241_run_codes, dnxhd_1235_1238_1241_run_bits, dnxhd_1235_1241_run,
       { 350, 390, 440, 730, 880 } },
+    { 1258, 960, 720, 0, 212992, 212992, 4, 8,
+      dnxhd_1258_luma_weight, dnxhd_1258_chroma_weight,
+      dnxhd_1258_dc_codes, dnxhd_1258_dc_bits,
+      dnxhd_1252_ac_codes, dnxhd_1252_ac_bits, dnxhd_1252_ac_level,
+      dnxhd_1252_ac_run_flag, dnxhd_1252_ac_index_flag,
+      dnxhd_1251_run_codes, dnxhd_1251_run_bits, dnxhd_1251_run,
+      { 42, 60, 75, 115 } },
 };
 
 int ff_dnxhd_get_cid_table(int cid)
diff --git a/libavcodec/dnxhddec.c b/libavcodec/dnxhddec.c
index 9b1e48158d..eb00e86af3 100644
--- a/libavcodec/dnxhddec.c
+++ b/libavcodec/dnxhddec.c
@@ -165,6 +165,15 @@ static int dnxhd_decode_header(DNXHDContext *ctx, AVFrame *frame,
     if ((ret = dnxhd_init_vlc(ctx, cid)) < 0)
         return ret;
 
+    // make sure profile size constraints are respected
+    // DNx100 allows 1920->1440 and 1280->960 subsampling
+    if (ctx->width != ctx->cid_table->width) {
+        av_reduce(&ctx->avctx->sample_aspect_ratio.num,
+                  &ctx->avctx->sample_aspect_ratio.den,
+                  ctx->width, ctx->cid_table->width, 255);
+        ctx->width = ctx->cid_table->width;
+    }
+
     if (buf_size < ctx->cid_table->coding_unit_size) {
         av_log(ctx->avctx, AV_LOG_ERROR, "incorrect frame size (%d < %d).\n",
                buf_size, ctx->cid_table->coding_unit_size);