#11203: Broken input duration may cause unnecessarily hang
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Reporter: milahu | Owner: (none)
Type: defect | Status: new
Priority: normal | Component: avformat
Version: 6.1.1 | Resolution:
Keywords: matroska | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by milahu):
minimal reproducer
{{{
#!/bin/sh
# make ffmpeg hang with "-resampler soxr"
set -eu
i=anullsrc=channel_layout=mono:sample_rate=48000
o=silence.wav
if ! [ -e "$o" ]; then
ffmpeg -f lavfi -i "$i" -t 30 -f wav "$o"
fi
i="$o"
o=-
# many other "to" values make ffmpeg hang, but not all
# 3.$RANDOM 4.$RANDOM 5.$RANDOM ...
to=3.1001
a=(
ffmpeg -hide_banner -nostdin
-to $to # input "to" breaks
-i "$i"
# -to $to # output "to" works
-af loudnorm=i=-23.0
-resampler soxr
-ar 48000
-f wav
"$o"
)
"${a[@]}" >/dev/null
}}}
by fuzzing, i found some other bad `to` values
all are greater than 3 seconds
my first 100 `to` values:
3.0004 3.0007 3.0011 3.0013 3.0016 3.0021 3.0030 3.0033 3.0036 3.1001
3.1002 3.1003 3.1004 3.1005 3.1006 3.1007 3.1008 3.1009 3.1010 3.1011
3.1012 3.1013 3.1014 3.1015 3.1016 3.1017 3.1018 3.1019 3.1020 3.1021
3.1022 3.1023 3.1024 3.1025 3.1026 3.1027 3.1028 3.1029 3.1030 3.1031
3.1032 3.1033 3.1034 3.1035 3.1036 3.1037 3.1038 3.1039 3.1040 3.1041
3.1042 3.1043 3.1044 3.1045 3.1046 3.1047 3.1048 3.1049 3.1050 3.1051
3.1052 3.1053 3.1054 3.1055 3.1056 3.1057 3.1058 3.1059 3.1060 3.1061
3.1062 3.1063 3.1064 3.1065 3.1066 3.1067 3.1068 3.1069 3.1070 3.1071
3.1072 3.2001 3.2002 3.2003 3.2004 3.2005 3.2006 3.2007 3.2008 3.2009
3.2010 3.2011 3.2012 3.2013 3.2014 3.2015 3.2016 3.2017 3.2018 3.2019
all `to` values smaller than 0.019284 make ffmpeg hang
and when i kill ffmpeg, it says
"Nothing was written into output file, because at least one of its streams
received no packets."
some `to` values make ffmpeg hang at time=00:00:00.00
--
Ticket URL: <https://trac.ffmpeg.org/ticket/11203#comment:5>
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