First try gave python: pthread_mutex_lock.c:62: __pthread_mutex_lock: Assertion `mutex->__data.__owner == 0' failed. [Thread 0xb0b07b40 (LWP 9675) exited] Program received signal SIGABRT, Aborted. [Switching to Thread 0xa13f8b40 (LWP 9712)] 0xb7fdd424 in __kernel_vsyscall () #0 0xb7fdd424 in __kernel_vsyscall () #1 0xb7e081df in raise () from /lib/i386-linux-gnu/libc.so.6 #2 0xb7e0b825 in abort () from /lib/i386-linux-gnu/libc.so.6 #3 0xb7e01085 in ?? () from /lib/i386-linux-gnu/libc.so.6 #4 0xb7e01137 in __assert_fail () from /lib/i386-linux-gnu/libc.so.6 #5 0xb7fafd5b in pthread_mutex_lock () from /lib/i386-linux-gnu/libpthread.so.0 #6 0xb45161a1 in producer_get_image (frame=frame@entry=0xb898730, buffer=buffer@entry=0xa13f7804, format=format@entry=0xa13f76bc, width=width@entry=0xa13f7274, height=height@entry=0xa13f7278, writable=writable@entry=1) at producer_avformat.c:1459 #7 0xb554e22e in mlt_frame_get_image (self=self@entry=0xb898730, buffer=buffer@entry=0xa13f7804, format=format@entry=0xa13f76bc, width=width@entry=0xa13f7274, height=height@entry=0xa13f7278, writable=writable@entry=1) at mlt_frame.c:475 #8 0xb5503100 in filter_get_image (frame=frame@entry=0xb898730, image=image@entry=0xa13f7804, format=format@entry=0xa13f76bc, width=width@entry=0xa13f7274, height=height@entry=0xa13f7278, writable=writable@entry=1) at filter_deinterlace.c:246 #9 0xb554e22e in mlt_frame_get_image (self=self@entry=0xb898730, buffer=buffer@entry=0xa13f7804, format=format@entry=0xa13f76bc, width=width@entry=0xa13f7274, height=height@entry=0xa13f7278, writable=writable@entry=1) at mlt_frame.c:475 #10 0xb453c740 in filter_get_image (frame=frame@entry=0xb898730, image=image@entry=0xa13f7804, format=format@entry=0xa13f76bc, width=width@entry=0xa13f7274, height=height@entry=0xa13f7278, writable=writable@entry=1) at filter_crop.c:77 #11 0xb554e22e in mlt_frame_get_image (self=self@entry=0xb898730, buffer=buffer@entry=0xa13f7804, format=format@entry=0xa13f76bc, width=width@entry=0xa13f7274, height=height@entry=0xa13f7278, writable=writable@entry=1) at mlt_frame.c:475 #12 0xb4542930 in filter_get_image (frame=frame@entry=0xb898730, image=image@entry=0xa13f7804, format=format@entry=0xa13f76bc, width=width@entry=0xa13f7460, height=height@entry=0xa13f7464, writable=writable@entry=1) at filter_rescale.c:217 #13 0xb554e22e in mlt_frame_get_image (self=self@entry=0xb898730, buffer=buffer@entry=0xa13f7804, format=format@entry=0xa13f76bc, width=width@entry=0xa13f7460, height=height@entry=0xa13f7464, writable=writable@entry=1) at mlt_frame.c:475 #14 0xb453df44 in get_image (frame=frame@entry=0xb898730, image=image@entry=0xa13f7804, format=format@entry=0xa13f76bc, width=width@entry=0xa13f7460, height=height@entry=0xa13f7464, writable=writable@entry=1) at filter_fieldorder.c:34 #15 0xb554e22e in mlt_frame_get_image (self=self@entry=0xb898730, buffer=buffer@entry=0xa13f7804, format=format@entry=0xa13f76bc, width=width@entry=0xa13f7460, height=height@entry=0xa13f7464, writable=writable@entry=1) at mlt_frame.c:475 #16 0xb4542fec in filter_get_image (frame=frame@entry=0xb898730, image=image@entry=0xa13f7804, format=format@entry=0xa13f76bc, width=width@entry=0xa13f7808, height=height@entry=0xa13f780c, writable=writable@entry=1) at filter_resize.c:262 #17 0xb554e22e in mlt_frame_get_image (self=self@entry=0xb898730, buffer=buffer@entry=0xa13f7804, format=format@entry=0xa13f76bc, width=width@entry=0xa13f7808, height=height@entry=0xa13f780c, writable=writable@entry=1) at mlt_frame.c:475 #18 0xb5561df2 in get_image_b (b_frame=b_frame@entry=0xb898730, image=image@entry=0xa13f7804, format=format@entry=0xa13f76bc, width=width@entry=0xa13f7808, height=height@entry=0xa13f780c, writable=writable@entry=1) at mlt_transition.c:352 #19 0xb554e22e in mlt_frame_get_image (self=self@entry=0xb898730, buffer=buffer@entry=0xa13f7804, format=format@entry=0xa13f76bc, width=width@entry=0xa13f7808, height=height@entry=0xa13f780c, writable=writable@entry=1) at mlt_frame.c:475 #20 0xb5561f21 in get_image_a (a_frame=a_frame@entry=0xb898730, image=image@entry=0xa13f7804, format=format@entry=0xa13f76bc, width=width@entry=0xa13f7808, height=height@entry=0xa13f780c, writable=writable@entry=1) at mlt_transition.c:326 #21 0xb554e22e in mlt_frame_get_image (self=self@entry=0xb898730, buffer=buffer@entry=0xa13f7804, format=format@entry=0xa13f76bc, width=width@entry=0xa13f7808, height=height@entry=0xa13f780c, writable=writable@entry=1) at mlt_frame.c:475 #22 0xb45448c3 in get_b_frame_image (self=self@entry=0xa3ceae8, b_frame=b_frame@entry=0xb898730, image=0xa13f7804, width=width@entry=0xa13f7808, height=height@entry=0xa13f780c, geometry=geometry@entry=0xa13f7828) at transition_composite.c:855 #23 0xb4545f0d in transition_get_image (a_frame=a_frame@entry=0xb7d63f8, image=image@entry=0xa13f8344, format=format@entry=0xa589b8c, width=width@entry=0xa13f8328, height=height@entry=0xa13f832c, writable=writable@entry=1) at transition_composite.c:1210 #24 0xb554e22e in mlt_frame_get_image (self=self@entry=0xb7d63f8, buffer=buffer@entry=0xa13f8344, format=format@entry=0xa589b8c, width=width@entry=0xa13f8328, height=height@entry=0xa13f832c, writable=writable@entry=1) at mlt_frame.c:475 #25 0xb5561f21 in get_image_a (a_frame=a_frame@entry=0xb7d63f8, image=image@entry=0xa13f8344, format=format@entry=0xa589b8c, width=width@entry=0xa13f8328, height=height@entry=0xa13f832c, writable=writable@entry=1) at mlt_transition.c:326 #26 0xb554e22e in mlt_frame_get_image (self=self@entry=0xb7d63f8, buffer=buffer@entry=0xa13f8344, format=format@entry=0xa589b8c, width=width@entry=0xa13f8328, height=height@entry=0xa13f832c, writable=writable@entry=1) at mlt_frame.c:475 #27 0xb4545dc1 in transition_get_image (a_frame=a_frame@entry=0xb7d63f8, image=image@entry=0xa13f8344, format=format@entry=0xa589b8c, width=width@entry=0xa13f8328, height=height@entry=0xa13f832c, writable=writable@entry=0) at transition_composite.c:1180 #28 0xb554e22e in mlt_frame_get_image (self=self@entry=0xb7d63f8, buffer=buffer@entry=0xa13f8344, format=format@entry=0xa589b8c, width=width@entry=0xa13f8328, height=height@entry=0xa13f832c, writable=writable@entry=0) at mlt_frame.c:475 #29 0xb55638ac in producer_get_image (self=self@entry=0xb8b52a0, buffer=buffer@entry=0xa13f8344, format=format@entry=0xa589b8c, width=width@entry=0xa13f8328, height=height@entry=0xa13f832c, writable=writable@entry=0) at mlt_tractor.c:273 #30 0xb554e22e in mlt_frame_get_image (self=self@entry=0xb8b52a0, buffer=buffer@entry=0xa13f8344, format=format@entry=0xa589b8c, width=width@entry=0xa13f8328, height=height@entry=0xa13f832c, writable=0, writable@entry=2) at mlt_frame.c:475 #31 0xb556007a in consumer_read_ahead_thread (arg=0xa589b48) at mlt_consumer.c:778 #32 0xb7fadd4c in start_thread () from /lib/i386-linux-gnu/libpthread.so.0 #33 0xb7ec8d3e in clone () from /lib/i386-linux-gnu/libc.so.6 Second try - Segmentation fault. #0 producer_get_image (frame=frame@entry=0xa4ec1150, buffer=buffer@entry=0xa0bf8dd4, format=format@entry=0xa0bf8c8c, width=width@entry=0xa0bf8844, height=height@entry=0xa0bf8848, writable=writable@entry=1) at producer_avformat.c:1468 #1 0xb554e22e in mlt_frame_get_image (self=self@entry=0xa4ec1150, buffer=buffer@entry=0xa0bf8dd4, format=format@entry=0xa0bf8c8c, width=width@entry=0xa0bf8844, height=height@entry=0xa0bf8848, writable=writable@entry=1) at mlt_frame.c:475 #2 0xb5503100 in filter_get_image (frame=frame@entry=0xa4ec1150, image=image@entry=0xa0bf8dd4, format=format@entry=0xa0bf8c8c, width=width@entry=0xa0bf8844, height=height@entry=0xa0bf8848, writable=writable@entry=1) at filter_deinterlace.c:246 #3 0xb554e22e in mlt_frame_get_image (self=self@entry=0xa4ec1150, buffer=buffer@entry=0xa0bf8dd4, format=format@entry=0xa0bf8c8c, width=width@entry=0xa0bf8844, height=height@entry=0xa0bf8848, writable=writable@entry=1) at mlt_frame.c:475 #4 0xb453c740 in filter_get_image (frame=frame@entry=0xa4ec1150, image=image@entry=0xa0bf8dd4, format=format@entry=0xa0bf8c8c, width=width@entry=0xa0bf8844, height=height@entry=0xa0bf8848, writable=writable@entry=1) at filter_crop.c:77 #5 0xb554e22e in mlt_frame_get_image (self=self@entry=0xa4ec1150, buffer=buffer@entry=0xa0bf8dd4, format=format@entry=0xa0bf8c8c, width=width@entry=0xa0bf8844, height=height@entry=0xa0bf8848, writable=writable@entry=1) at mlt_frame.c:475 #6 0xb4542930 in filter_get_image (frame=frame@entry=0xa4ec1150, image=image@entry=0xa0bf8dd4, format=format@entry=0xa0bf8c8c, width=width@entry=0xa0bf8a30, height=height@entry=0xa0bf8a34, writable=writable@entry=1) at filter_rescale.c:217 #7 0xb554e22e in mlt_frame_get_image (self=self@entry=0xa4ec1150, buffer=buffer@entry=0xa0bf8dd4, format=format@entry=0xa0bf8c8c, width=width@entry=0xa0bf8a30, height=height@entry=0xa0bf8a34, writable=writable@entry=1) at mlt_frame.c:475 #8 0xb453df44 in get_image (frame=frame@entry=0xa4ec1150, image=image@entry=0xa0bf8dd4, format=format@entry=0xa0bf8c8c, width=width@entry=0xa0bf8a30, height=height@entry=0xa0bf8a34, writable=writable@entry=1) at filter_fieldorder.c:34 #9 0xb554e22e in mlt_frame_get_image (self=self@entry=0xa4ec1150, buffer=buffer@entry=0xa0bf8dd4, format=format@entry=0xa0bf8c8c, width=width@entry=0xa0bf8a30, height=height@entry=0xa0bf8a34, writable=writable@entry=1) at mlt_frame.c:475 #10 0xb4542fec in filter_get_image (frame=frame@entry=0xa4ec1150, image=image@entry=0xa0bf8dd4, format=format@entry=0xa0bf8c8c, width=width@entry=0xa0bf8dd8, height=height@entry=0xa0bf8ddc, writable=writable@entry=1) at filter_resize.c:262 #11 0xb554e22e in mlt_frame_get_image (self=self@entry=0xa4ec1150, buffer=buffer@entry=0xa0bf8dd4, format=format@entry=0xa0bf8c8c, width=width@entry=0xa0bf8dd8, height=height@entry=0xa0bf8ddc, writable=writable@entry=1) at mlt_frame.c:475 #12 0xb5561df2 in get_image_b (b_frame=b_frame@entry=0xa4ec1150, image=image@entry=0xa0bf8dd4, format=format@entry=0xa0bf8c8c, width=width@entry=0xa0bf8dd8, height=height@entry=0xa0bf8ddc, writable=writable@entry=1) at mlt_transition.c:352 #13 0xb554e22e in mlt_frame_get_image (self=self@entry=0xa4ec1150, buffer=buffer@entry=0xa0bf8dd4, format=format@entry=0xa0bf8c8c, width=width@entry=0xa0bf8dd8, height=height@entry=0xa0bf8ddc, writable=writable@entry=1) at mlt_frame.c:475 #14 0xb5561df2 in get_image_b (b_frame=b_frame@entry=0xa4ec1150, image=image@entry=0xa0bf8dd4, format=format@entry=0xa0bf8c8c, width=width@entry=0xa0bf8dd8, height=height@entry=0xa0bf8ddc, writable=writable@entry=1) at mlt_transition.c:352 #15 0xb554e22e in mlt_frame_get_image (self=self@entry=0xa4ec1150, buffer=buffer@entry=0xa0bf8dd4, format=format@entry=0xa0bf8c8c, width=width@entry=0xa0bf8dd8, height=height@entry=0xa0bf8ddc, writable=writable@entry=1) at mlt_frame.c:475 #16 0xb45448c3 in get_b_frame_image (self=self@entry=0xa050788, b_frame=b_frame@entry=0xa4ec1150, image=0xa0bf8dd4, width=width@entry=0xa0bf8dd8, height=height@entry=0xa0bf8ddc, geometry=geometry@entry=0xa0bf8df8) at transition_composite.c:855 #17 0xb4545f0d in transition_get_image (a_frame=a_frame@entry=0xa3c459c0, image=image@entry=0xa0bf9344, format=format@entry=0x99cba1c, width=width@entry=0xa0bf9328, height=height@entry=0xa0bf932c, writable=writable@entry=0) at transition_composite.c:1210 #18 0xb554e22e in mlt_frame_get_image (self=self@entry=0xa3c459c0, buffer=buffer@entry=0xa0bf9344, format=format@entry=0x99cba1c, width=width@entry=0xa0bf9328, height=height@entry=0xa0bf932c, writable=writable@entry=0) at mlt_frame.c:475 #19 0xb55638ac in producer_get_image (self=self@entry=0xac50cb58, buffer=buffer@entry=0xa0bf9344, format=format@entry=0x99cba1c, width=width@entry=0xa0bf9328, height=height@entry=0xa0bf932c, writable=writable@entry=0) at mlt_tractor.c:273 #20 0xb554e22e in mlt_frame_get_image (self=self@entry=0xac50cb58, buffer=buffer@entry=0xa0bf9344, format=format@entry=0x99cba1c, width=width@entry=0xa0bf9328, height=height@entry=0xa0bf932c, writable=0, writable@entry=2) at mlt_frame.c:475 #21 0xb556007a in consumer_read_ahead_thread (arg=0x99cb9d8) at mlt_consumer.c:778 #22 0xb7fadd4c in start_thread () from /lib/i386-linux-gnu/libpthread.so.0 #23 0xb7ec8d3e in clone () from /lib/i386-linux-gnu/libc.so.6 A debugging session is active. Inferior 1 [process 9987] will be killed. Quit anyway? (y or n)