[MPlayer-dvb] SEGV in libmpeg2, r31395.

[Bill Pringlemeir]

There is a segfault when playing certain 'TS' atsc captures.  It
appears to be related to motion compensation.

Current directory is /home/src/mplayer/
GNU gdb 6.8-debian
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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This GDB was configured as "i486-linux-gnu"...
(gdb) set args /dtv/cut/AmericanWoodshop-0619-1030.ts 
(gdb) r
Starting program: /home/src/mplayer/mplayer /dtv/cut/AmericanWoodshop-0619-1030.ts 
[Thread debugging using libthread_db enabled]
MPlayer SVN-r31528-4.3.2 (C) 2000-2010 MPlayer Team

Playing /dtv/cut/AmericanWoodshop-0619-1030.ts.
Cache fill:  0.00% (0 bytes)   
TS file format detected.
VIDEO MPEG2(pid=65) AUDIO A52(pid=68) NO SUBS (yet)!  PROGRAM N. 4
VIDEO:  MPEG2  704x480  (aspect 2)  29.970 fps  15000.0 kbps (1875.0 kbyte/s)
==========================================================================
Trying to force video codec driver family libmpeg2...
Opening video decoder: [libmpeg2] libmpeg2 MPEG 1/2 Video decoder
Selected video codec: [mpeg12] vfm: libmpeg2 (MPEG-1 or 2 (libmpeg2))
==========================================================================
==========================================================================
Forced audio codec: ffac3
Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
AUDIO: 48000 Hz, 2 ch, s16le, 192.0 kbit/12.50% (ratio: 24000->192000)
Selected audio codec: [ffac3] afm: ffmpeg (FFmpeg AC-3)
==========================================================================
[New Thread 0xb4d408f0 (LWP 7031)]
[New Thread 0xb44b2b90 (LWP 7039)]
AO: [pulse] 48000Hz 2ch s16le (2 bytes per sample)
Starting playback...
Movie-Aspect is 1.33:1 - prescaling to correct movie aspect.
VO: [xv] 704x480 => 704x528 Planar YV12  [fs]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb4d408f0 (LWP 7031)]
MC_put_o_16_mmxext (dest=0xb3948020 "", ref=0x0, stride=704, height=16) at libmpeg2/motion_comp_mmx.c:544
(gdb) where
#0  MC_put_o_16_mmxext (dest=0xb3948020 "", ref=0x0, stride=704, height=16) at libmpeg2/motion_comp_mmx.c:544
#1  0x0826bec9 in motion_fr_frame_420 (decoder=0xa9adac0, motion=0xa9adb38, table=0x8e48100) at libmpeg2/slice.c:1508
#2  0x08275255 in mpeg2_slice (decoder=0xa9adac0, code=1, buffer=0xb46f3040 "\"X\b\v,") at libmpeg2/slice.c:1917
#3  0x08265972 in mpeg2_parse (mpeg2dec=0xa9adac0) at libmpeg2/decode.c:188
#4  0x082648bd in decode (sh=0xa97fca0, data=0xb481e008, len=1416, flags=0) at libmpcodecs/vd_libmpeg2.c:179
#5  0x0815441b in decode_video (sh_video=0xa97fca0, start=0xb481e008 "", in_size=1412, drop_frame=0, pts=39468.6484375) at libmpcodecs/dec_video.c:412
#6  0x080a4261 in update_video (blit_frame=0xbfdeb4a4) at mplayer.c:2440
#7  0x080a8a4e in main (argc=2, argv=0xbfdeb564) at mplayer.c:3861

The macros within libmpeg2/slice.c have me thrown off.  Recently there
was a merge in mplayer with the upstream libmpeg2 code.  I think this
was the problem.  I will retry with r31354 and see if that is helpful.

Regards,
Bill Pringlemeir.