Rendering in kdenlive failed whatever setting was used. I tried to run melt on the command line. The trace below was the result.
I was suspicious of the tap_vibrato.so entry, so I removed the tap-plugins. Running melt again showed no more crashes.
I don't know what's going on, whether this is an issue with tap_vibrato.so or melt itself.
Description: Ubuntu 12.04 LTS
Package: tap-plugins
Status: install ok installed
Priority: optional
Section: sound
Installed-Size: 409
Maintainer: Ubuntu Developers <email address hidden>
Architecture: amd64
Version: 0.7.1-2fakesync1
Provides: ladspa-plugin
Depends: libc6 (>= 2.2.5)
Package: melt
Status: install ok installed
Priority: optional
Section: utils
Installed-Size: 75
Maintainer: Ubuntu Developers <email address hidden>
Architecture: amd64
Source: mlt
Version: 0.7.6+git20120204-2
Depends: libc6 (>= 2.4), libmlt4, libmlt-data (>= 0.7.6+git20120204-2)
$ melt
*** glibc detected *** melt: free(): invalid pointer: 0x00007f473eb3b858 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x7e626)[0x7f473e803626]
/usr/lib/ladspa/tap_vibrato.so(delete_descriptor+0x17)[0x7f473c06db97]
/lib64/ld-linux-x86-64.so.2(+0x1470e)[0x7f473ef9870e]
/lib64/ld-linux-x86-64.so.2(+0x133b4)[0x7f473ef973b4]
/lib/x86_64-linux-gnu/libdl.so.2(+0xf26)[0x7f473e581f26]
/lib64/ld-linux-x86-64.so.2(+0xf176)[0x7f473ef93176]
/lib/x86_64-linux-gnu/libdl.so.2(+0x152f)[0x7f473e58252f]
/lib/x86_64-linux-gnu/libdl.so.2(dlopen+0x31)[0x7f473e581fc1]
/usr/lib/mlt/libmltjackrack.so(+0x7f2a)[0x7f473d67ef2a]
/usr/lib/mlt/libmltjackrack.so(plugin_mgr_new+0xbb)[0x7f473d67f29b]
/usr/lib/mlt/libmltjackrack.so(mlt_register+0x18)[0x7f473d67bc18]
/usr/lib/libmlt.so.4(mlt_repository_init+0xbd)[0x7f473ed79ced]
/usr/lib/libmlt.so.4(mlt_factory_init+0x270)[0x7f473ed79470]
melt(main+0x29)[0x7f473f1ab449]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xed)[0x7f473e7a676d]
melt(+0x3539)[0x7f473f1ac539]
======= Memory map: ========
7f473c06c000-7f473c06e000 r-xp 00000000 08:06 266115 /usr/lib/ladspa/tap_vibrato.so
7f473c06e000-7f473c26e000 ---p 00002000 08:06 266115 /usr/lib/ladspa/tap_vibrato.so
7f473c26e000-7f473c26f000 r--p 00002000 08:06 266115 /usr/lib/ladspa/tap_vibrato.so
7f473c26f000-7f473c270000 rw-p 00003000 08:06 266115 /usr/lib/ladspa/tap_vibrato.so
7f473c270000-7f473c271000 rw-p 00000000 00:00 0
7f473c271000-7f473c2ad000 r-xp 00000000 08:06 1835278 /lib/x86_64-linux-gnu/libpcre.so.3.12.1
7f473c2ad000-7f473c4ac000 ---p 0003c000 08:06 1835278 /lib/x86_64-linux-gnu/libpcre.so.3.12.1
7f473c4ac000-7f473c4ad000 r--p 0003b000 08:06 1835278 /lib/x86_64-linux-gnu/libpcre.so.3.12.1
7f473c4ad000-7f473c4ae000 rw-p 0003c000 08:06 1835278 /lib/x86_64-linux-gnu/libpcre.so.3.12.1
7f473c4ae000-7f473c4c4000 r-xp 00000000 08:06 1835853 /lib/x86_64-linux-gnu/libz.so.1.2.3.4
7f473c4c4000-7f473c6c3000 ---p 00016000 08:06 1835853 /lib/x86_64-linux-gnu/libz.so.1.2.3.4
7f473c6c3000-7f473c6c4000 r--p 00015000 08:06 1835853 /lib/x86_64-linux-gnu/libz.so.1.2.3.4
7f473c6c4000-7f473c6c5000 rw-p 00016000 08:06 1835853 /lib/x86_64-linux-gnu/libz.so.1.2.3.4
7f473c6c5000-7f473c6da000 r-xp 00000000 08:06 1835017 /lib/x86_64-linux-gnu/libgcc_s.so.1
7f473c6da000-7f473c8d9000 ---p 00015000 08:06 1835017 /lib/x86_64-linux-gnu/libgcc_s.so.1
7f473c8d9000-7f473c8da000 r--p 00014000 08:06 1835017 /lib/x86_64-linux-gnu/libgcc_s.so.1
7f473c8da000-7f473c8db000 rw-p 00015000 08:06 1835017 /lib/x86_64-linux-gnu/libgcc_s.so.1
7f473c8db000-7f473c8e2000 r-xp 00000000 08:06 1868489 /lib/x86_64-linux-gnu/librt-2.15.so
7f473c8e2000-7f473cae1000 ---p 00007000 08:06 1868489 /lib/x86_64-linux-gnu/librt-2.15.so
7f473cae1000-7f473cae2000 r--p 00006000 08:06 1868489 /lib/x86_64-linux-gnu/librt-2.15.so
7f473cae2000-7f473cae3000 rw-p 00007000 08:06 1868489 /lib/x86_64-linux-gnu/librt-2.15.so
7f473cae3000-7f473cbc5000 r-xp 00000000 08:06 28277 /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.16
7f473cbc5000-7f473cdc4000 ---p 000e2000 08:06 28277 /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.16
7f473cdc4000-7f473cdcc000 r--p 000e1000 08:06 28277 /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.16
7f473cdcc000-7f473cdce000 rw-p 000e9000 08:06 28277 /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.16
7f473cdce000-7f473cde3000 rw-p 00000000 00:00 0
7f473cde3000-7f473ced5000 r-xp 00000000 08:06 1835557 /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.3
7f473ced5000-7f473d0d5000 ---p 000f2000 08:06 1835557 /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.3
7f473d0d5000-7f473d0d6000 r--p 000f2000 08:06 1835557 /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.3
7f473d0d6000-7f473d0d7000 rw-p 000f3000 08:06 1835557 /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.3
7f473d0d7000-7f473d0d8000 rw-p 00000000 00:00 0
7f473d0d8000-7f473d229000 r-xp 00000000 08:06 16046 /usr/lib/x86_64-linux-gnu/libxml2.so.2.7.8
7f473d229000-7f473d428000 ---p 00151000 08:06 16046 /usr/lib/x86_64-linux-gnu/libxml2.so.2.7.8
7f473d428000-7f473d430000 r--p 00150000 08:06 16046 /usr/lib/x86_64-linux-gnu/libxml2.so.2.7.8
7f473d430000-7f473d432000 rw-p 00158000 08:06 16046 /usr/lib/x86_64-linux-gnu/libxml2.so.2.7.8
7f473d432000-7f473d433000 rw-p 00000000 00:00 0
7f473d433000-7f473d474000 r-xp 00000000 08:06 5952 /usr/lib/x86_64-linux-gnu/libjack.so.0.1.0
7f473d474000-7f473d674000 ---p 00041000 08:06 5952 /usr/lib/x86_64-linux-gnu/libjack.so.0.1.0
7f473d674000-7f473d676000 r--p 00041000 08:06 5952 /usr/lib/x86_64-linux-gnu/libjack.so.0.1.0
7f473d676000-7f473d677000 rw-p 00043000 08:06 5952 /usr/lib/x86_64-linux-gnu/libjack.so.0.1.0
7f473d677000-7f473d685000 r-xp 00000000 08:06 1057679 /usr/lib/mlt/libmltjackrack.so
7f473d685000-7f473d885000 ---p 0000e000 08:06 1057679 /usr/lib/mlt/libmltjackrack.so
7f473d885000-7f473d886000 r--p 0000e000 08:06 1057679 /usr/lib/mlt/libmltjackrack.so
7f473d886000-7f473d887000 rw-p 0000f000 08:06 1057679 /usr/lib/mlt/libmltjackrack.so
7f473d887000-7f473d980000 r-xp 00000000 08:06 1835132 /lib/x86_64-linux-gnu/libm-2.15.so
7f473d980000-7f473db7f000 ---p 000f9000 08:06 1835132 /lib/x86_64-linux-gnu/libm-2.15.so
7f473db7f000-7f473db80000 r--p 000f8000 08:06 1835132 /lib/x86_64-linux-gnu/libm-2.15.so
7f473db80000-7f473db81000 rw-p 000f9000 08:06 1835132 /lib/x86_64-linux-gnu/libm-2.15.so
7f473db81000-7f473db9b000 r-xp 00000000 08:06 11414 /usr/lib/x86_64-linux-gnu/libdv.so.4.0.3
7f473db9b000-7f473dd9a000 ---p 0001a000 08:06 11414 /usr/lib/x86_64-linux-gnu/libdv.so.4.0.3
7f473dd9a000-7f473dd9b000 r--p 00019000 08:06 11414 /usr/lib/x86_64-linux-gnu/libdv.so.4.0.3
7f473dd9b000-7f473dd9d000 rw-p 0001a000 08:06 11414 /usr/lib/x86_64-linux-gnu/libdv.so.4.0.3
7f473dd9d000-7f473ddab000 rw-p 00000000 00:00 0
7f473ddab000-7f473ddb0000 r-xp 00000000 08:06 1057675 /usr/lib/mlt/libmltdv.so
7f473ddb0000-7f473dfaf000 ---p 00005000 08:06 1057675 /usr/lib/mlt/libmltdv.so
7f473dfaf000-7f473dfb0000 r--p 00004000 08:06 1057675 /usr/lib/mlt/libmltdv.so
7f473dfb0000-7f473dfb1000 rw-p 00005000 08:06 1057675 /usr/lib/mlt/libmltdv.so
7f473dfb1000-7f473dfbb000 r-xp 00000000 08:06 1057682 /usr/lib/mlt/libmltlinsys.so
7f473dfbb000-7f473e1ba000 ---p 0000a000 08:06 1057682 /usr/lib/mlt/libmltlinsys.so
7f473e1ba000-7f473e1bb000 r--p 00009000 08:06 1057682 /usr/lib/mlt/libmltlinsys.so
7f473e1bb000-7f473e1bc000 rw-p 0000a000 08:06 1057682 /usr/lib/mlt/libmltlinsys.so
7f473e1bc000-7f473e581000 r--p 00000000 08:06 15117 /usr/lib/locale/locale-archive
7f473e581000-7f473e583000 r-xp 00000000 08:06 1868506 /lib/x86_64-linux-gnu/libdl-2.15.so
7f473e583000-7f473e783000 ---p 00002000 08:06 1868506 /lib/x86_64-linux-gnu/libdl-2.15.so
7f473e783000-7f473e784000 r--p 00002000 08:06 1868506 /lib/x86_64-linux-gnu/libdl-2.15.so
7f473e784000-7f473e785000 rw-p 00003000 08:06 1868506 /lib/x86_64-linux-gnu/libdl-2.15.so
7f473e785000-7f473e938000 r-xp 00000000 08:06 1835133 /lib/x86_64-linux-gnu/libc-2.15.so
7f473e938000-7f473eb37000 ---p 001b3000 08:06 1835133 /lib/x86_64-linux-gnu/libc-2.15.so
7f473eb37000-7f473eb3b000 r--p 001b2000 08:06 1835133 /lib/x86_64-linux-gnu/libc-2.15.so
7f473eb3b000-7f473eb3d000 rw-p 001b6000 08:06 1835133 /lib/x86_64-linux-gnu/libc-2.15.so
7f473eb3d000-7f473eb42000 rw-p 00000000 00:00 0
7f473eb42000-7f473eb5a000 r-xp 00000000 08:06 1868513 /lib/x86_64-linux-gnu/libpthread-2.15.so
7f473eb5a000-7f473ed59000 ---p 00018000 08:06 1868513 /lib/x86_64-linux-gnu/libpthread-2.15.so
7f473ed59000-7f473ed5a000 r--p 00017000 08:06 1868513 /lib/x86_64-linux-gnu/libpthread-2.15.so
7f473ed5a000-7f473ed5b000 rw-p 00018000 08:06 1868513 /lib/x86_64-linux-gnu/libpthread-2.15.so
7f473ed5b000-7f473ed5f000 rw-p 00000000 00:00 0
7f473ed5f000-7f473ed83000 r-xp 00000000 08:06 26973 /usr/lib/libmlt.so.0.7.7
7f473ed83000-7f473ef82000 ---p 00024000 08:06 26973 /usr/lib/libmlt.so.0.7.7
7f473ef82000-7f473ef83000 r--p 00023000 08:06 26973 /usr/lib/libmlt.so.0.7.7
7f473ef83000-7f473ef84000 rw-p 00024000 08:06 26973 /usr/lib/libmlt.so.0.7.7
7f473ef84000-7f473efa6000 r-xp 00000000 08:06 1868464 /lib/x86_64-linux-gnu/ld-2.15.so
7f473f16c000-7f473f170000 rw-p 00000000 00:00 0
7f473f1a3000-7f473f1a6000 rw-p 00000000 00:00 0
7f473f1a6000-7f473f1a7000 r--p 00022000 08:06 1868464 /lib/x86_64-linux-gnu/ld-2.15.so
7f473f1a7000-7f473f1a9000 rw-p 00023000 08:06 1868464 /lib/x86_64-linux-gnu/ld-2.15.so
7f473f1a9000-7f473f1b0000 r-xp 00000000 08:06 33303 /usr/bin/melt
7f473f3af000-7f473f3b0000 r--p 00006000 08:06 33303 /usr/bin/melt
7f473f3b0000-7f473f3b1000 rw-p 00007000 08:06 33303 /usr/bin/melt
7f4740a2b000-7f4740a4c000 rw-p 00000000 00:00 0 [heap]
7fff50bab000-7fff50bcc000 rw-p 00000000 00:00 0 [stack]
7fff50bff000-7fff50c00000 r-xp 00000000 00:00 0 [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall]
Afgebroken (geheugendump gemaakt)
Status changed to 'Confirmed' because the bug affects multiple users.