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|
#!/bin/sh
: "${MPV:=mpv}"
: "${ILDETECT_MPV:=$MPV}"
: "${ILDETECT_MPVFLAGS:=--start=35% --length=35}"
: "${ILDETECT_DRY_RUN:=}"
: "${ILDETECT_QUIET:=}"
: "${ILDETECT_RUN_INTERLACED_ONLY:=}"
: "${ILDETECT_FORCE_RUN:=}"
# This script uses ffmpeg's "idet" filter for interlace detection. In the
# long run this should replace ildetect.sh+ildetect.so.
# exit status:
# 0 progressive
# 1 telecine
# 2 interlaced
# 8 unknown
# 16 detect fail
# 17+ mpv's status | 16
testfun()
{
$ILDETECT_MPV "$@" \
--vf-add=lavfi="[idet]" --msg-level ffmpeg=v \
--o= --vo=null --no-audio --untimed \
$ILDETECT_MPVFLAGS \
| { if [ -n "$ILDETECT_QUIET" ]; then cat; else tee /dev/stderr; fi } \
| grep "Parsed_idet_0: Multi frame detection: "
}
judge()
{
tff=0
bff=0
progressive=0
undetermined=0
while read -r _ _ _ _ _ _ tff1 _ bff1 _ progressive1 _ undetermined1 _; do
case "$tff1$bff1$progressive1$undetermined1" in
*[!0-9]*)
printf >&2 'ERROR: Unrecognized idet output: %s\n' "$out"
exit 16
;;
esac
tff=$((tff + tff1))
bff=$((bff + bff1))
progressive=$((progressive + progressive1))
undetermined=$((undetermined + undetermined1))
done <<EOF
$(testfun "$@" | sed 's/:/: /g')
EOF
interlaced=$((bff + tff))
determined=$((interlaced + progressive))
if [ "$undetermined" -gt "$determined" ] || [ "$determined" -lt 250 ]; then
echo >&2 "ERROR: Less than 50% or 250 frames are determined."
[ -n "$ILDETECT_FORCE_RUN" ] || exit 8
echo >&2 "Assuming interlacing."
if [ "$tff" -gt $((bff * 10)) ]; then
verdict="interlaced-tff"
elif [ "$bff" -gt $((tff * 10)) ]; then
verdict="interlaced-bff"
else
verdict="interlaced"
fi
elif [ $((interlaced * 20)) -gt "$progressive" ]; then
# At least 5% of the frames are interlaced!
if [ "$tff" -gt $((bff * 10)) ]; then
verdict="interlaced-tff"
elif [ "$bff" -gt $((tff * 10)) ]; then
verdict="interlaced-bff"
else
echo >&2 "ERROR: Content is interlaced, but can't determine field order."
[ -n "$ILDETECT_FORCE_RUN" ] || exit 8
echo >&2 "Assuming interlacing with default field order."
verdict="interlaced"
fi
else
# Likely progressive
verdict="progressive"
fi
printf '%s\n' "$verdict"
}
judge "$@" --vf-clr
case "$verdict" in
progressive)
[ -n "$ILDETECT_DRY_RUN" ] || \
[ -n "$ILDETECT_RUN_INTERLACED_ONLY" ] || \
$ILDETECT_MPV "$@"
r=$?
[ $r -eq 0 ] || exit $((r | 16))
exit 0
;;
interlaced-tff)
judge "$@" --vf-clr --vf-pre=lavfi=\[setfield=tff\],pullup
case "$verdict" in
progressive)
[ -n "$ILDETECT_DRY_RUN" ] || \
$ILDETECT_MPV "$@" --vf-pre=lavfi=\[setfield=tff\],pullup
r=$?
[ $r -eq 0 ] || exit $((r | 16))
exit 1
;;
*)
[ -n "$ILDETECT_DRY_RUN" ] || \
$ILDETECT_MPV "$@" --vf-pre=lavfi=\[setfield=tff\],yadif
r=$?
[ $r -eq 0 ] || exit $((r | 16))
exit 2
;;
esac
;;
interlaced-bff)
judge "$@" --vf-clr --vf-pre=lavfi=\[setfield=bff\],pullup
case "$verdict" in
progressive)
[ -n "$ILDETECT_DRY_RUN" ] || \
$ILDETECT_MPV "$@" --vf-pre=lavfi=\[setfield=bff\],pullup
r=$?
[ $r -eq 0 ] || exit $((r | 16))
exit 1
;;
*)
[ -n "$ILDETECT_DRY_RUN" ] || \
$ILDETECT_MPV "$@" --vf-pre=lavfi=\[setfield=bff\],yadif
r=$?
[ $r -eq 0 ] || exit $((r | 16))
exit 2
;;
esac
;;
interlaced)
judge "$@" --vf-clr --vf-pre=pullup
case "$verdict" in
progressive)
[ -n "$ILDETECT_DRY_RUN" ] || \
$ILDETECT_MPV "$@" --vf-pre=pullup
r=$?
[ $r -eq 0 ] || exit $((r | 16))
exit 1
;;
*)
[ -n "$ILDETECT_DRY_RUN" ] || \
$ILDETECT_MPV "$@" --vf-pre=yadif
r=$?
[ $r -eq 0 ] || exit $((r | 16))
exit 2
;;
esac
;;
*)
echo >&2 "ERROR: Internal error."
exit 16
;;
esac
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