fate: add test for Ticket4816 (PNG decoding with alpha)

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

tests/fate/video.mak

@@ -93,6 +93,9 @@ fate-cljr: CMD = framecrc -i $(TARGET_SAMPLES)/cljr/testcljr-partial.avi
 FATE_VIDEO-$(call DEMDEC, AVI, PNG) += fate-corepng
 fate-corepng: CMD = framecrc -i $(TARGET_SAMPLES)/png1/corepng-partial.avi
 
+FATE_VIDEO-$(call DEMDEC, AVI, PNG) += fate-rgbapng-4816
+fate-rgbapng-4816: CMD = framecrc -i $(TARGET_SAMPLES)/png1/55c99e750a5fd6_50314226.png
+
 FATE_VIDEO-$(call DEMDEC, AVS, AVS) += fate-creatureshock-avs
 fate-creatureshock-avs: CMD = framecrc -i $(TARGET_SAMPLES)/creatureshock-avs/OUTATIME.AVS -pix_fmt rgb24
 

tests/ref/fate/rgbapng-4816

+#tb 0: 1/25
+#media_type 0: video
+#codec_id 0: rawvideo
+#dimensions 0: 330x330
+#sar 0: 0/1
+0,          0,          0,        1,   435600, 0x961c0f09