To check if it really is a problem with MLT, you should try playing/seeking with your source files using the command line player melt:
https://answers.launchpad.net/openshot/+faq/983 ** Changed in: openshot Status: New => Incomplete -- You received this bug notification because you are a member of OpenShot Bugs, which is subscribed to OpenShot Video Editor. https://bugs.launchpad.net/bugs/890377 Title: Segfault when moving through preview with arrow keys Status in OpenShot Video Editor: Incomplete Bug description: During editing a rather complex video, I get crashes of Openshot now and then. I'm using OpenShot 1.4.0 on Ubuntu 11.04 with libmlt4 0.7.6-0ubuntu0~sunab~natty1 This here is the backtrace I got with gdb: Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 0x7fffcb6d2700 (LWP 2652)] __pthread_mutex_lock (mutex=0x6c706d61732e64b1) at pthread_mutex_lock.c:50 50 pthread_mutex_lock.c: Datei oder Verzeichnis nicht gefunden. in pthread_mutex_lock.c (gdb) bt #0 __pthread_mutex_lock (mutex=0x6c706d61732e64b1) at pthread_mutex_lock.c:50 #1 0x00007fffecb49b5d in mlt_properties_find (self=0x5377f90, name=0x7fffecb5ad30 "in") at mlt_properties.c:488 #2 mlt_properties_get_position (self=0x5377f90, name=0x7fffecb5ad30 "in") at mlt_properties.c:1001 #3 0x00007fffecb4d9a6 in mlt_service_apply_filters ( self=<value optimized out>, frame=0x21e9fe00, index=1) at mlt_service.c:415 #4 0x00007fffecb4dbce in mlt_service_get_frame (self=0xda9c820, frame=0x7fffd40b6cc8, index=7) at mlt_service.c:469 #5 0x00007fffecb56031 in transition_get_frame (service=0xdcd3b10, frame=0x7fffad11f1a0, index=0) at mlt_transition.c:431 #6 0x00007fffecb4db5f in mlt_service_get_frame (self=0xdcd3b10, frame=0x7fffad11f1a0, index=0) at mlt_service.c:457 #7 0x00007fffecb56031 in transition_get_frame (service=0xda9c520, frame=0x7fffcb6d1bd8, index=0) at mlt_transition.c:431 #8 0x00007fffecb4db5f in mlt_service_get_frame (self=0xda9c520, frame=0x7fffcb6d1bd8, index=0) at mlt_service.c:457 #9 0x00007fffecb56749 in producer_get_frame (parent=0xcede460, frame=0x7fffcb6d1dc8, track=<value optimized out>) at mlt_tractor.c:395 #10 0x00007fffecb4f6a9 in producer_get_frame (service=0xcede460, frame=0x7fffcb6d1dc8, index=0) at mlt_producer.c:584 ---Type <return> to continue, or q <return> to quit--- #11 0x00007fffecb4db5f in mlt_service_get_frame (self=0xcede460, frame=0x7fffcb6d1dc8, index=0) at mlt_service.c:457 #12 0x00007fffecb4db5f in mlt_service_get_frame (self=0x1d24710, frame=0x7fffcb6d1dc8, index=0) at mlt_service.c:457 #13 0x00007fffecb53b02 in mlt_consumer_get_frame (self=0x1d24710) at mlt_consumer.c:547 #14 0x00007fffecb53f82 in consumer_read_ahead_thread (arg=0x1d24710) at mlt_consumer.c:694 #15 0x00007ffff7bc4d8c in start_thread (arg=0x7fffcb6d2700) at pthread_create.c:304 #16 0x00007ffff6a8a04d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112 #17 0x0000000000000000 in ?? () (gdb) bt full #0 __pthread_mutex_lock (mutex=0x6c706d61732e64b1) at pthread_mutex_lock.c:50 __PRETTY_FUNCTION__ = "__pthread_mutex_lock" type = <value optimized out> id = <value optimized out> #1 0x00007fffecb49b5d in mlt_properties_find (self=0x5377f90, name=0x7fffecb5ad30 "in") at mlt_properties.c:488 list = 0x6c706d61732e6169 value = 0x0 key = 37 i = <value optimized out> #2 mlt_properties_get_position (self=0x5377f90, name=0x7fffecb5ad30 "in") at mlt_properties.c:1001 value = 0x0 #3 0x00007fffecb4d9a6 in mlt_service_apply_filters ( self=<value optimized out>, frame=0x21e9fe00, index=1) at mlt_service.c:415 in = <value optimized out> out = <value optimized out> disable = <value optimized out> i = <value optimized out> frame_properties = 0x21e9fe00 service_properties = <value optimized out> ---Type <return> to continue, or q <return> to quit--- base = 0xda89c90 position = 0 self_in = 0 self_out = 0 #4 0x00007fffecb4dbce in mlt_service_get_frame (self=0xda9c820, frame=0x7fffd40b6cc8, index=7) at mlt_service.c:469 properties = 0x21e9fe00 in = 0 out = 0 position = -1 result = <value optimized out> #5 0x00007fffecb56031 in transition_get_frame (service=0xdcd3b10, frame=0x7fffad11f1a0, index=0) at mlt_transition.c:431 active = 0 i = 7 a_frame = 0 invalid = 0x7fffecb45600 <mlt_frame_is_test_card> b_frame = 8 position = <value optimized out> error = 0 self = 0xdcd3b10 ---Type <return> to continue, or q <return> to quit--- properties = 0xdcd3b10 accepts_blanks = 0 a_track = 0 b_track = 8 in = 12588 out = 12635 always_active = 0 type = 1 reverse_order = 0 #6 0x00007fffecb4db5f in mlt_service_get_frame (self=0xdcd3b10, frame=0x7fffad11f1a0, index=0) at mlt_service.c:457 properties = 0xdcd3b10 in = 12588 out = 12635 position = -1 result = 0 #7 0x00007fffecb56031 in transition_get_frame (service=0xda9c520, frame=0x7fffcb6d1bd8, index=0) at mlt_transition.c:431 active = 0 i = 0 a_frame = 0 ---Type <return> to continue, or q <return> to quit--- invalid = 0x7fffecb45640 <mlt_frame_is_test_audio> b_frame = 8 position = <value optimized out> error = 0 self = 0xda9c520 properties = 0xda9c520 accepts_blanks = 0 a_track = 0 b_track = 8 in = 11791 out = 12635 always_active = 1 type = 2 reverse_order = 0 #8 0x00007fffecb4db5f in mlt_service_get_frame (self=0xda9c520, frame=0x7fffcb6d1bd8, index=0) at mlt_service.c:457 properties = 0xda9c520 in = 11791 out = 12635 position = -1 result = 0 ---Type <return> to continue, or q <return> to quit--- #9 0x00007fffecb56749 in producer_get_frame (parent=0xcede460, frame=0x7fffcb6d1dc8, track=<value optimized out>) at mlt_tractor.c:395 props_count = <value optimized out> j = <value optimized out> video = <value optimized out> label = "\270\320v\255\377\177\000\000}\232\264\354\377\177\000\000>\250\265\354\377\177\000\000\000\000\000\000\000" id = 0x7fffd653d200 "\260/\002\256\377\177" frame_properties = 0x7fffd661eef0 audio = <value optimized out> first_video = <value optimized out> temp_properties = <value optimized out> target = <value optimized out> image_count = <value optimized out> global_feed = 1 done = <value optimized out> temp = 0x0 count = <value optimized out> properties = 0xcede460 i = <value optimized out> multitrack = <value optimized out> ---Type <return> to continue, or q <return> to quit--- producer = <value optimized out> data_queue = 0x7fff8bf650f0 self = 0xcede460 #10 0x00007fffecb4f6a9 in producer_get_frame (service=0xcede460, frame=0x7fffcb6d1dc8, index=0) at mlt_producer.c:584 properties = 0xcede460 eof = <value optimized out> speed = 0 clone = 0xcede460 result = 1 self = 0xcede460 #11 0x00007fffecb4db5f in mlt_service_get_frame (self=0xcede460, frame=0x7fffcb6d1dc8, index=0) at mlt_service.c:457 properties = 0xcede460 in = 0 out = 84377 position = 13260 result = 0 #12 0x00007fffecb4db5f in mlt_service_get_frame (self=0x1d24710, frame=0x7fffcb6d1dc8, index=0) at mlt_service.c:457 properties = 0x1d24710 ---Type <return> to continue, or q <return> to quit--- in = 0 out = 0 position = -1 result = 0 #13 0x00007fffecb53b02 in mlt_consumer_get_frame (self=0x1d24710) at mlt_consumer.c:547 frame = 0x7fffd661eef0 service = 0x1d24710 properties = 0x1d24710 #14 0x00007fffecb53f82 in consumer_read_ahead_thread (arg=0x1d24710) at mlt_consumer.c:694 time_current = 0 self = 0x1d24710 properties = 0x1d24710 width = 1920 height = 1080 video_off = 0 preview_off = <value optimized out> preview_format = <value optimized out> afmt = mlt_audio_pcm counter = 23617 ---Type <return> to continue, or q <return> to quit--- fps = 25 channels = 2 frequency = 48000 samples = 1920 audio = 0x1a01a000 audio_off = 0 buffer = 2 frame = <value optimized out> image = 0x7fffaed44c20 "+}+\206+}+\206+}+\206+}+\206+}+\206+}*\206)})\206)})\206(}*\206*}+\206,}/\206/|0\207\060{/\207/{.\210.{.\210.{.\210.{,\210,{+\207,{-\207-{*\210){(\207(|%\205!|\037\205\037~\036\204\035\177\033\202\033\200\033\202\034\200\033\202\033\200\033\202\033\200\034\202\034\200\034\202\033\200\033\202\033\200\033\202\036\177\036\202\036\177\035\202\035\177\035\202\035\177\035\202\035\177\035\202\035\177\035\202\036\177\036\202\036\177\036\202\036\177\035\202\035\177\035\202\035\177\035\202\035\177\034\203\034\177\034\203\034\177\035\203\036\177\036\203\036\177\035\203\035\177\035\203\035\177\035\203"... ante = {tv_sec = 1321297968, tv_usec = 966213} count = 1 skipped = 0 time_process = 0 skip_next = 0 ---Type <return> to continue, or q <return> to quit--- pos = <value optimized out> start_pos = 13260 last_pos = 13260 frame_duration = 40000 drop_max = 5 #15 0x00007ffff7bc4d8c in start_thread (arg=0x7fffcb6d2700) at pthread_create.c:304 pd = 0x7fffcb6d2700 now = <value optimized out> unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140736606316288, -2960163981755843542, 140737349746176, 140736606316992, 0, 3, 2960259483603401770, 2960146927023127594}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}} not_first_call = 0 robust = <value optimized out> sp = <value optimized out> freesize = <value optimized out> __PRETTY_FUNCTION__ = "start_thread" #16 0x00007ffff6a8a04d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112 ---Type <return> to continue, or q <return> to quit--- No locals. #17 0x0000000000000000 in ?? 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