Bug#825431: vlc: SIGFPE (divide by zero) while transcoding in line 551 of modules/stream_out/transcode/video.c (transcode_video_encoder_init)
Will Aoki
waoki at umnh.utah.edu
Thu May 26 20:58:29 UTC 2016
Package: vlc
Version: 2.2.1-1~deb8u1
Severity: normal
Tags: patch
We run VLC as a daemon to transcode an MJPEG stream from a StarDot camera and
pipe it into another program. After upgrading from wheezy to jessie, VLC began
to crash with SIGFPE.
Although the root cause may be elsewhere in VLC, the patch at
https://patches.videolan.org/patch/10246/ resolves the problem.
This report in the OpenSUSE Bugzilla is probably the same problem:
https://bugzilla.opensuse.org/show_bug.cgi?id=978282
Details on my installation:
VLC is invoked as follows:
/usr/bin/vlc -I dummy --repeat --sout-keep --http-reconnect http://ip-redacted/nph-mjpeg.cgi --sout '#transcode{venc=x264{keyint=60,profile=baseline,level=3.0,nocabac},vcodec=x264,vb=500,scale=1,acodec=none,threads=6}:rtp{dst=127.0.0.1,port=10000,mux=ts}' --syslog
Data from core dump:
$ gdb /usr/bin/vlc ~/core
GNU gdb (Debian 7.7.1+dfsg-5) 7.7.1
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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Reading symbols from /usr/bin/vlc...Reading symbols from /usr/lib/debug/.build-id/59/71b866af7e3d3a228ce9bed06f5dbcd2f65181.debug...done.
done.
[New LWP 15816]
[New LWP 15814]
[New LWP 15809]
[New LWP 15824]
[New LWP 15806]
[New LWP 15812]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/bin/vlc -I dummy --repeat --sout-keep --http-reconnect http://172.18.51.40'.
Program terminated with signal SIGFPE, Arithmetic exception.
#0 0x00007fd3467855b0 in transcode_video_encoder_init (p_stream=0x7fd338008738,
id=0x7fd3340008c0) at transcode/video.c:551
551 id->i_input_frame_interval = id->p_decoder->fmt_out.video.i_frame_rate_base * CLOCK_FREQ / id->p_decoder->fmt_out.video.i_frame_rate;
(gdb) print id->p_decoder->fmt_out.video.i_frame_rate
$1 = 0
(gdb) print id->p_decoder->fmt_out.video.i_frame_rate_base
$2 = 0
(gdb) bt
#0 0x00007fd3467855b0 in transcode_video_encoder_init (p_stream=0x7fd338008738,
id=0x7fd3340008c0) at transcode/video.c:551
#1 0x00007fd346785ebf in transcode_video_process (p_stream=0x7fd338008738,
id=0x7fd3340008c0, in=0x7fd338c353d0, out=0x7fd346787db3,
out at entry=0x7fd3471d6e10) at transcode/video.c:884
#2 0x00007fd34678143b in Send (p_stream=0x7fd338008738, id=0x7fd3340008c0,
p_buffer=<optimized out>) at transcode/transcode.c:661
#3 0x00007fd35933d118 in sout_InputSendBuffer (p_input=0x7fd3340009a0,
p_buffer=p_buffer at entry=0x7fd338c353d0) at stream_output/stream_output.c:233
#4 0x00007fd3592ca994 in DecoderPlaySout (p_sout_block=0x7fd338c353d0,
p_dec=0x7fd338c20018) at input/decoder.c:1501
#5 DecoderProcessSout (p_block=0x0, p_dec=<optimized out>) at input/decoder.c:1556
#6 DecoderProcess (p_block=<optimized out>, p_dec=<optimized out>)
at input/decoder.c:1787
#7 DecoderThread (p_data=0x7fd338c20018) at input/decoder.c:909
#8 0x00007fd359b440a4 in start_thread (arg=0x7fd3471d7700) at pthread_create.c:309
#9 0x00007fd35967587d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
(gdb)
-- System Information:
Debian Release: 8.4
APT prefers stable
APT policy: (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 3.16.0-4-amd64 (SMP w/3 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
Versions of packages vlc depends on:
ii fonts-freefont-ttf 20120503-4
ii libaa1 1.4p5-43
ii libavcodec56 6:11.6-1~deb8u1
ii libavutil54 6:11.6-1~deb8u1
ii libc6 2.19-18+deb8u4
ii libcaca0 0.99.beta19-2
ii libegl1-mesa [libegl1-x11] 10.3.2-1+deb8u1
ii libfreerdp-cache1.1 1.1.0~git20140921.1.440916e+dfsg1-4
ii libfreerdp-client1.1 1.1.0~git20140921.1.440916e+dfsg1-4
ii libfreerdp-codec1.1 1.1.0~git20140921.1.440916e+dfsg1-4
ii libfreerdp-core1.1 1.1.0~git20140921.1.440916e+dfsg1-4
ii libfreerdp-crypto1.1 1.1.0~git20140921.1.440916e+dfsg1-4
ii libfreerdp-gdi1.1 1.1.0~git20140921.1.440916e+dfsg1-4
ii libfreerdp-locale1.1 1.1.0~git20140921.1.440916e+dfsg1-4
ii libfreerdp-rail1.1 1.1.0~git20140921.1.440916e+dfsg1-4
ii libfreerdp-utils1.1 1.1.0~git20140921.1.440916e+dfsg1-4
ii libfreetype6 2.5.2-3+deb8u1
ii libfribidi0 0.19.6-3
ii libgcc1 1:4.9.2-10
ii libgl1-mesa-glx [libgl1] 10.3.2-1+deb8u1
ii libgles1-mesa [libgles1] 10.3.2-1+deb8u1
ii libgles2-mesa [libgles2] 10.3.2-1+deb8u1
ii libice6 2:1.0.9-1+b1
ii libpulse0 5.0-13
ii libqtcore4 4:4.8.6+git64-g5dc8b2b+dfsg-3+deb8u1
ii libqtgui4 4:4.8.6+git64-g5dc8b2b+dfsg-3+deb8u1
ii libsdl-image1.2 1.2.12-5+b5
ii libsdl1.2debian 1.2.15-10+b1
ii libsm6 2:1.2.2-1+b1
ii libstdc++6 4.9.2-10
ii libva-drm1 1.4.1-1
ii libva-x11-1 1.4.1-1
ii libva1 1.4.1-1
ii libvlccore8 2.2.1-1~deb8u1
ii libvncclient0 0.9.9+dfsg2-6.1+deb8u1
ii libwinpr-rpc0.1 1.1.0~git20140921.1.440916e+dfsg1-4
ii libwinpr-sspi0.1 1.1.0~git20140921.1.440916e+dfsg1-4
ii libwinpr-utils0.1 1.1.0~git20140921.1.440916e+dfsg1-4
ii libx11-6 2:1.6.2-3
ii libxcb-composite0 1.10-3+b1
ii libxcb-keysyms1 0.4.0-1
ii libxcb-randr0 1.10-3+b1
ii libxcb-render0 1.10-3+b1
ii libxcb-shape0 1.10-3+b1
ii libxcb-shm0 1.10-3+b1
ii libxcb-xfixes0 1.10-3+b1
ii libxcb-xv0 1.10-3+b1
ii libxcb1 1.10-3+b1
ii libxext6 2:1.3.3-1
ii libxinerama1 2:1.1.3-1+b1
ii libxpm4 1:3.5.11-1+b1
ii vlc-nox 2.2.1-1~deb8u1
ii zlib1g 1:1.2.8.dfsg-2+b1
Versions of packages vlc recommends:
pn vlc-plugin-notify <none>
ii vlc-plugin-samba 2.2.1-1~deb8u1
pn xdg-utils <none>
Versions of packages vlc suggests:
pn videolan-doc <none>
-- no debconf information
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