[vlc-devel] segfault caused by who-knows-what

Cian Cullinan cian.cullinan at gmail.com
Tue Jan 31 18:10:07 CET 2006

The following command line results in VLC segfaulting after a while
(from a few minutes to over an hour sometimes):

/usr/bin/vlc -vvv --no-mmxext  --color  -I telnet --telnet-password
blahblah --telnet-host localhost --telnet-port 4212 --vlm-conf

where multicast_test03.vlm is:
new channel1 broadcast enabled loop
setup channel1 input /data/movies/test/Bannow.mp4
setup channel1 output
#standard{mux=ts,access=udp,url=,sap,name="Channel 1"}
new channel2 broadcast enabled loop
setup channel2 input /data/movies/test/Mares.mp4
setup channel2 output
#standard{mux=ts,access=udp,url=,sap,name="Channel 2"}
control channel1 play
control channel2 play

Doing a backtrace in gdb gives the following:
#0  0x080cf724 in fast_memcpy__memcpymmxext (to=0xb5499d40,
from=0xaf22eff3, len=46) at fastmemcpy.h:342
#1  0x080dfdbf in EStoPES__mux_ts (p_sout=0x9326a68,
pp_pes=0xb49fd0e0, p_es=Variable "p_es" is not available.
) at pes.c:306
#2  0x080dea16 in Mux (p_mux=0x932b188) at ts.c:1443
#3  0x00111eca in Send (p_stream=0x932a870, id=0x934c8b0,
p_buffer=0xb544a608) at standard.c:453
#4  0x0807ef23 in sout_InputSendBuffer (p_input=0x934c8a0,
p_buffer=0xb544a608) at src/stream_output/stream_output.c:276
#5  0x080ad488 in DecoderDecode (p_dec=0xb5403f98, p_block=0x0) at
#6  0x080b033b in EsOutSend (out=0x9329ee0, es=0xb5422238,
p_block=0xaf202288) at src/input/es_out.c:1084
#7  0x00c78aa3 in Demux (p_demux=0xb5409810) at
#8  0x08065f4e in MainLoop (p_input=0xb5401e30) at src/input/input.c:527
#9  0x08066d8e in Run (p_input=0xb5401e30) at src/input/input.c:434
#10 0x00471341 in start_thread () from /lib/tls/libpthread.so.0
#11 0x0035d6fe in clone () from /lib/tls/libc.so.6

and "frame 0" reports:
#0  0x080cf724 in fast_memcpy__memcpymmxext (to=0xb5499d40,
from=0xaf22eff3, len=46) at fastmemcpy.h:342
342                     __asm__ __volatile__ (

Talking with some people on IRC it was thought that VLC was using CPU
MMX EXT when it shouldn't (the machine is a dual proc Xeon, and there
is no mention of mmxext in /proc/cpuinfo), but I get the same results
when running the above command line with the --no-mmxext option.

The machine in question is running CentOS 4.2, and VLC snapshot from
2006-01-29, and ffmpeg SVN code from 2006-01-03.
VLC was compiled on my laptop with a Pentium M processor.
The two files it is multicasting are MPEG4/AAC, about 4096kb, encoded
in Quicktime Pro.
I have not seen this problem with a couple of lower bandwidth movie
files, also MPEG/AAC when they have been running for several days.

Anyone have any ideas?


P.S. my config line for compiling VLC:
./configure \
    --x-libraries=/usr/X11R6/lib \
    --enable-release \
    --enable-livedotcom --with-livedotcom-tree=live \
    --enable-ffmpeg --with-ffmpeg-tree=ffmpeg-20060103 \
    --enable-faad --with-faad-tree=faad2-20040923 \
    --enable-mozilla \
    --enable-faad \
    --enable-dvbpsi \
    --disable-dvdread \
    --disable-hal \
    --disable-dvdnav \
    --disable-smb \
    --disable-gnomevfs \
    --disable-libcdio \
    --disable-libcddb \
    --disable-cdda \
    --disable-vcd \
    --disable-screen \
    --disable-mkv \
    --disable-mod \
    --disable-mpc \
    --disable-dts \
    --disable-speex \
    --disable-x264 \
    --disable-cmml \
    --disable-glx \
    --disable-opengl \
    --disable-fribidi \
    --disable-sdl \
    --disable-skins2 \
    --disable-hd1000v \
    --disable-hd1000a \
    --disable-fb \
    --disable-wxwidgets \
    --disable-visual \
    --disable-daap \

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