[FFmpeg-trac] #8202(undetermined:new): outside the range of unsigned long at libavcodec/ratecontrol.c
FFmpeg
trac at avcodec.org
Wed Sep 25 17:26:59 EEST 2019
#8202: outside the range of unsigned long at libavcodec/ratecontrol.c
-------------------------------------+-------------------------------------
Reporter: Suhwan | Type: defect
Status: new | Priority: normal
Component: | Version: git-
undetermined | master
Keywords: ubsan | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug:
There is outside the range of unsigned long at
libavcodec/ratecontrol.c:967:37
{{{
libavcodec/ratecontrol.c:967:37: runtime error: -4.52978e+06 is outside
the range of representable values of type 'unsigned long'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
libavcodec/ratecontrol.c:967:37 in
#0 ff_rate_estimate_qscale (s=0x626000000100, dry_run=0)
at libavcodec/ratecontrol.c:967
#1 0x000000000437e887 in estimate_qp (s=0x626000000100, dry_run=0)
at libavcodec/mpegvideo_enc.c:3607
#2 0x000000000436ae4e in encode_picture (s=0x626000000100,
picture_number=6)
at libavcodec/mpegvideo_enc.c:3807
#3 0x000000000433e284 in ff_mpv_encode_picture (avctx=0x619000002380,
pkt=0x60e000010780, pic_arg=<optimized out>,
got_packet=0x7fffffffae00)
at libavcodec/mpegvideo_enc.c:1868
#4 0x000000000313a8d1 in avcodec_encode_video2 (avctx=0x619000002380,
avpkt=<optimized out>, frame=0x616000050480, got_packet_ptr=<optimized
out>)
at libavcodec/encode.c:302
#5 0x000000000313da5f in do_encode (avctx=<optimized out>,
frame=0x616000050480,
got_packet=0x7fffffffae00) at libavcodec/encode.c:371
#6 0x000000000313d13f in avcodec_send_frame (avctx=<optimized out>,
frame=0x616000050480) at libavcodec/encode.c:420
#7 0x000000000065b93d in do_video_out (of=0x60a0000002c0,
ost=0x616000001e80,
next_picture=0x616000050480, sync_ipts=4.9406564584124654e-324)
at fftools/ffmpeg.c:1287
#8 0x00000000006536ee in reap_filters (flush=0) at fftools/ffmpeg.c:1504
#9 0x00000000005e7433 in transcode_step () at fftools/ffmpeg.c:4648
#10 transcode () at fftools/ffmpeg.c:4692
#11 0x00000000005db6ec in main (argc=<optimized out>, argv=<optimized
out>)
at fftools/ffmpeg.c:4894
}}}
How to reproduce:
{{{
% ./ffmpeg_g -stream_loop 23 -y -i flower-palette-02.tif -target vcd
-loglevel 0 -map 0 -c:a:48 pcm_f64le -c:v:0 h263p -ab 420k -ac 3 -strict 3
tmp.x11grab
ffmpeg version N-94982-gea673a0edb Copyright (c) 2000-2019 the FFmpeg
developers
built with clang version 6.0.0-1ubuntu2 (tags/RELEASE_600/final)
configuration: --cc=clang --cxx=clang++ --ld=clang --enable-debug
--toolchain=clang-usan
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/8202>
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