Fix opacity and increase colour dynamics of initial vmd palette.

libavcodec/vmdav.c

@@ -408,7 +408,8 @@ static av_cold int vmdvideo_decode_init(AVCodecContext *avctx)
         r = raw_palette[palette_index++] * 4;
         g = raw_palette[palette_index++] * 4;
         b = raw_palette[palette_index++] * 4;
-        palette32[i] = (r << 16) | (g << 8) | (b);
+        palette32[i] = 0xFFU << 24 | (r << 16) | (g << 8) | (b);
+        palette32[i] |= palette32[i] >> 6 & 0x30303;
     }
 
     avcodec_get_frame_defaults(&s->prev_frame);

tests/ref/fate/filter-gradfun-sample

 #tb 0: 1/10
-0,          0,          0,        1,    76800, 0xc87b6728
-0,          1,          1,        1,    76800, 0xb0b24bc8
-0,          2,          2,        1,    76800, 0x45a22d68
-0,          3,          3,        1,    76800, 0x1821013b
-0,          4,          4,        1,    76800, 0xfb17dc4f
-0,          5,          5,        1,    76800, 0x07714cf0
-0,          6,          6,        1,    76800, 0x7a5f14df
-0,          7,          7,        1,    76800, 0x421fe837
-0,          8,          8,        1,    76800, 0x39b9af40
-0,          9,          9,        1,    76800, 0x42b47d6b
-0,         10,         10,        1,    76800, 0xb1084cc8
-0,         11,         11,        1,    76800, 0x0772794c
-0,         12,         12,        1,    76800, 0x99544be0
-0,         13,         13,        1,    76800, 0x5f1a16c1
-0,         14,         14,        1,    76800, 0x90bfe8ac
-0,         15,         15,        1,    76800, 0xbd9bb834
-0,         16,         16,        1,    76800, 0x658d8053
-0,         17,         17,        1,    76800, 0x21cc5656
-0,         18,         18,        1,    76800, 0x6d39208b
-0,         19,         19,        1,    76800, 0x17b0f8cb
+0,          0,          0,        1,    76800, 0x8228830e
+0,          1,          1,        1,    76800, 0x1c196731
+0,          2,          2,        1,    76800, 0xf7924863
+0,          3,          3,        1,    76800, 0x66e41b5e
+0,          4,          4,        1,    76800, 0x79ccf593
+0,          5,          5,        1,    76800, 0xd35b667c
+0,          6,          6,        1,    76800, 0xd70b2d3a
+0,          7,          7,        1,    76800, 0x122fffcd
+0,          8,          8,        1,    76800, 0x1989c5b8
+0,          9,          9,        1,    76800, 0x94de92e9
+0,         10,         10,        1,    76800, 0x5f946148
+0,         11,         11,        1,    76800, 0x3b448caa
+0,         12,         12,        1,    76800, 0xbbab5e46
+0,         13,         13,        1,    76800, 0x8977280a
+0,         14,         14,        1,    76800, 0x1ad8f8f4
+0,         15,         15,        1,    76800, 0x719dc79c
+0,         16,         16,        1,    76800, 0xf3598e9a
+0,         17,         17,        1,    76800, 0xe7b86365
+0,         18,         18,        1,    76800, 0x4e492c41
+0,         19,         19,        1,    76800, 0x922e036a