fate-lavfi: replace sed/grep/cut combos with awk

Signed-off-by: Mans Rullgard <mans@mansr.com>

tests/lavfi-regression.sh

@@ -49,7 +49,7 @@ do_lavfi_pixfmts(){
     out_fmts=${outfile}${1}_out_fmts
 
     # exclude pixel formats which are not supported as input
-    $avconv -pix_fmts list 2>/dev/null | sed -ne '9,$p' | grep '^\..\.' | cut -d' ' -f2 | sort >$exclude_fmts
+    $avconv -pix_fmts list 2>/dev/null | awk 'NR > 8 && /^\..\./ { print $2 }' | sort >$exclude_fmts
     $showfiltfmts scale | awk -F '[ \r]' '/^OUTPUT/{ print $3 }' | sort | comm -23 - $exclude_fmts >$out_fmts
 
     pix_fmts=$($showfiltfmts $filter | awk -F '[ \r]' '/^INPUT/{ print $3 }' | sort | comm -12 - $out_fmts)
@@ -70,7 +70,7 @@ do_lavfi_pixfmts "scale"   "200:100"
 do_lavfi_pixfmts "vflip"   ""
 
 if [ -n "$do_pixdesc" ]; then
-    pix_fmts="$($avconv -pix_fmts list 2>/dev/null | sed -ne '9,$p' | grep '^IO' | cut -d' ' -f2 | sort)"
+    pix_fmts="$($avconv -pix_fmts list 2>/dev/null | awk 'NR > 8 && /^IO/ { print $2 }' | sort)"
     for pix_fmt in $pix_fmts; do
         do_video_filter $pix_fmt "slicify=random,format=$pix_fmt,pixdesctest" -pix_fmt $pix_fmt
     done