fate/filter-refcmp-*: make refcmp_metadata fail on empty or truncated input

On empty input the awk script was always successful which caused the
filter-refcmp tests to always succeed.

Also fix the command lines for refcmp_metadata compare function because it
needs auto conversion filters, and update reference of test
filter-refcmp-psnr-rgb because it was missed in
a7fc78c1a6 but was never noticed due to the
original issue...

Signed-off-by: Marton Balint <cus@passwd.hu>

tests/fate-run.sh

@@ -377,7 +377,7 @@ refcmp_metadata(){
     refcmp=$1
     pixfmt=$2
     fuzz=${3:-0.001}
-    ffmpeg $FLAGS $ENC_OPTS \
+    ffmpeg -auto_conversion_filters $FLAGS $ENC_OPTS \
         -lavfi "testsrc2=size=300x200:rate=1:duration=5,format=${pixfmt},split[ref][tmp];[tmp]avgblur=4[enc];[enc][ref]${refcmp},metadata=print:file=-" \
         -f null /dev/null | awk -v ref=${ref} -v fuzz=${fuzz} -f ${base}/refcmp-metadata.awk -
 }

tests/ref/fate/filter-refcmp-psnr-rgb

@@ -1,45 +1,45 @@
 frame:0    pts:0       pts_time:0
-lavfi.psnr.mse.r=1381.80
+lavfi.psnr.mse.r=1367.642090
-lavfi.psnr.psnr.r=16.73
+lavfi.psnr.psnr.r=16.771078
-lavfi.psnr.mse.g=896.00
+lavfi.psnr.mse.g=885.804382
-lavfi.psnr.psnr.g=18.61
+lavfi.psnr.psnr.g=18.657425
-lavfi.psnr.mse.b=277.38
+lavfi.psnr.mse.b=274.825073
-lavfi.psnr.psnr.b=23.70
+lavfi.psnr.psnr.b=23.740240
-lavfi.psnr.mse_avg=851.73
+lavfi.psnr.mse_avg=842.757202
-lavfi.psnr.psnr_avg=18.83
+lavfi.psnr.psnr_avg=18.873779
 frame:1    pts:1       pts_time:1
-lavfi.psnr.mse.r=1380.37
+lavfi.psnr.mse.r=1356.681152
-lavfi.psnr.psnr.r=16.73
+lavfi.psnr.psnr.r=16.806026
-lavfi.psnr.mse.g=975.91
+lavfi.psnr.mse.g=958.161560
-lavfi.psnr.psnr.g=18.24
+lavfi.psnr.psnr.g=18.316416
-lavfi.psnr.mse.b=435.72
+lavfi.psnr.mse.b=428.238312
-lavfi.psnr.psnr.b=21.74
+lavfi.psnr.psnr.b=21.813948
-lavfi.psnr.mse_avg=930.67
+lavfi.psnr.mse_avg=914.360352
-lavfi.psnr.psnr_avg=18.44
+lavfi.psnr.psnr_avg=18.519630
 frame:2    pts:2       pts_time:2
-lavfi.psnr.mse.r=1403.20
+lavfi.psnr.mse.r=1387.254883
-lavfi.psnr.psnr.r=16.66
+lavfi.psnr.psnr.r=16.709242
-lavfi.psnr.mse.g=954.05
+lavfi.psnr.mse.g=939.230957
-lavfi.psnr.psnr.g=18.34
+lavfi.psnr.psnr.g=18.403080
-lavfi.psnr.mse.b=494.22
+lavfi.psnr.mse.b=493.913757
-lavfi.psnr.psnr.b=21.19
+lavfi.psnr.psnr.b=21.194292
-lavfi.psnr.mse_avg=950.49
+lavfi.psnr.mse_avg=940.133179
-lavfi.psnr.psnr_avg=18.35
+lavfi.psnr.psnr_avg=18.398911
 frame:3    pts:3       pts_time:3
-lavfi.psnr.mse.r=1452.80
+lavfi.psnr.mse.r=1433.291260
-lavfi.psnr.psnr.r=16.51
+lavfi.psnr.psnr.r=16.567459
-lavfi.psnr.mse.g=1001.02
+lavfi.psnr.mse.g=990.005859
-lavfi.psnr.psnr.g=18.13
+lavfi.psnr.psnr.g=18.174425
-lavfi.psnr.mse.b=557.39
+lavfi.psnr.mse.b=550.512329
-lavfi.psnr.psnr.b=20.67
+lavfi.psnr.psnr.b=20.723133
-lavfi.psnr.mse_avg=1003.74
+lavfi.psnr.mse_avg=991.269836
-lavfi.psnr.psnr_avg=18.11
+lavfi.psnr.psnr_avg=18.168884
 frame:4    pts:4       pts_time:4
-lavfi.psnr.mse.r=1401.25
+lavfi.psnr.mse.r=1385.949341
-lavfi.psnr.psnr.r=16.67
+lavfi.psnr.psnr.r=16.713329
-lavfi.psnr.mse.g=1009.80
+lavfi.psnr.mse.g=997.065796
-lavfi.psnr.psnr.g=18.09
+lavfi.psnr.psnr.g=18.143566
-lavfi.psnr.mse.b=602.42
+lavfi.psnr.mse.b=601.962952
-lavfi.psnr.psnr.b=20.33
+lavfi.psnr.psnr.b=20.335106
-lavfi.psnr.mse_avg=1004.49
+lavfi.psnr.mse_avg=994.992676
-lavfi.psnr.psnr_avg=18.11
+lavfi.psnr.psnr_avg=18.152605

tests/refcmp-metadata.awk

@@ -50,13 +50,16 @@ BEGIN {
 }
 
 END {
+    result = result && (NR == ref_nr);
     if (result) {
         for (i = 1; i <= ref_nr; i++)
             print ref_lines[i];
     } else {
         for (i = 1; i <= NR; i++)
             print cmp_lines[i];
-        if (NR != ref_nr)
+        if (NR == 0)
+            print "[refcmp] no input" > "/dev/stderr";
+        else if (NR != ref_nr)
             print "[refcmp] lines: " NR " != " ref_nr > "/dev/stderr";
         if (delta_max >= fuzz)
             print "[refcmp] delta_max: " delta_max " >= " fuzz > "/dev/stderr";