fate: enhance tpad filter test

Adds another test that uses the start_duration and stop_duration
options instead of start and stop.

Signed-off-by: Anton Khirnov <anton@khirnov.net>

tests/fate/filter-video.mak

@@ -299,9 +299,10 @@ fate-filter-tblend: CMD = framecrc -c:v pgmyuv -i $(SRC) -vf tblend=all_mode=dif
 FATE_FILTER_VSYNTH_PGMYUV-$(CONFIG_TELECINE_FILTER) += fate-filter-telecine
 fate-filter-telecine: CMD = framecrc -c:v pgmyuv -i $(SRC) -vf telecine
 
-FATE_FILTER-$(call FILTERFRAMECRC, TESTSRC2 TPAD) += fate-filter-tpad-add fate-filter-tpad-clone
+FATE_FILTER-$(call FILTERFRAMECRC, TESTSRC2 TPAD) += fate-filter-tpad-add fate-filter-tpad-clone fate-filter-tpad-add-duration
 fate-filter-tpad-add:   CMD = framecrc -lavfi testsrc2=d=1:r=2,tpad=start=1:stop=3:color=gray
 fate-filter-tpad-clone: CMD = framecrc -lavfi testsrc2=d=1:r=2,tpad=start=1:stop=2:stop_mode=clone:color=black
+fate-filter-tpad-add-duration: CMD = framecrc -lavfi testsrc2=d=1:r=2,tpad=start_duration=0.5s:stop_duration=1.5s:color=gray
 
 FATE_FILTER_VSYNTH_PGMYUV-$(CONFIG_TRANSPOSE_FILTER) += fate-filter-transpose
 fate-filter-transpose: CMD = framecrc -c:v pgmyuv -i $(SRC) -vf transpose

tests/ref/fate/filter-tpad-add-duration

@@ -0,0 +1,11 @@
+#tb 0: 1/2
+#media_type 0: video
+#codec_id 0: rawvideo
+#dimensions 0: 320x240
+#sar 0: 1/1
+0,          0,          0,        1,   115200, 0x2213b502
+0,          1,          1,        1,   115200, 0xeba70ff3
+0,          2,          2,        1,   115200, 0xa764e4d5
+0,          3,          3,        1,   115200, 0x2213b502
+0,          4,          4,        1,   115200, 0x2213b502
+0,          5,          5,        1,   115200, 0x2213b502