[mythtv-commits] Ticket #7796: mythtranscode memcpy segmentation fault
MythTV
mythtv at cvs.mythtv.org
Sun Jan 24 18:10:37 UTC 2010
#7796: mythtranscode memcpy segmentation fault
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Reporter: Andrea Giuliano <sarkiaponius@…> | Owner: ijr
Type: defect | Status: closed
Priority: major | Milestone: 0.22
Component: MythTV - Mythtranscode | Version: 0.22
Severity: medium | Resolution: invalid
Mlocked: 0 |
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Comment(by nas@…):
The problem is that the Debian 0.22 package links to /usr/lib/libmpeg2
instead of libmythmpeg2. That is done because of the Debian patch
"debian/patches/01_libmythmpeg2.diff" and removing that patch fixes the
problem. I will report this to the package maintainer.
In case someone is interesting if figuring out why libmpeg2 doesn't work,
here is some debugging information. Note that info->gob is NULL. I don't
understand the code well enough to determine why.
{{{
(gdb) bt
#0 0x0806fa0f in MPEG2fixup::ProcessVideo (this=0x80fd320, vf=0x8103758,
dec=0x810e240) at mpeg2fix.cpp:869
#1 0x0807250a in MPEG2fixup::GetFrame (this=0x80fd320, pkt=0xbfd949c4)
at mpeg2fix.cpp:1308
#2 0x0807d9d7 in MPEG2fixup::FindStart (this=0x80fd320) at
mpeg2fix.cpp:1338
#3 0x08084202 in MPEG2fixup::Start (this=0x80fd320) at mpeg2fix.cpp:1874
#4 0x0805a8ac in main (argc=135018816, argv=0xfffffff7) at main.cpp:629
(gdb) l 869
864 sizeof(mpeg2_sequence_t));
865 vf->isSequence = 1;
866 break;
867
868 case STATE_GOP:
869 memcpy(&vf->mpeg2_gop, info->gop,
sizeof(mpeg2_gop_t));
870 vf->isGop = 1;
871 vf->gopPos = vf->pkt.data + last_pos;
872 //pd->adjustFrameCount=0;
873 break;
(gdb) p info->gop
$9 = (const mpeg2_gop_t *) 0x0
(gdb) p dec->info
$10 = {sequence = 0x1e0, gop = 0x0, current_picture = 0x0,
current_picture_2nd = 0x3, current_fbuf = 0x7, display_picture = 0x3,
display_picture_2nd = 0x0, display_fbuf = 0x0, discard_fbuf = 0x0,
user_data = 0x1 <Address 0x1 out of bounds>, user_data_len = 134875264}
}}}
--
Ticket URL: <http://svn.mythtv.org/trac/ticket/7796#comment:7>
MythTV <http://www.mythtv.org/>
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