Thank you for your bug, debug backtrace:

#0  0xb77caf94 in png_push_handle_unknown (png_ptr=0xb32fc018, 
info_ptr=0xb3205428, length=3072949465) at pngpread.c:1514
1514           png_free(png_ptr, chunk.data);
(gdb) bt
#0  0xb77caf94 in png_push_handle_unknown (png_ptr=0xb32fc018, 
info_ptr=0xb3205428, length=3072949465) at pngpread.c:1514
#1  0xb77cb87e in png_combine_row (png_ptr=0xb32fc018, row=0xb3205428 "", 
mask=1054) at pnggccrd.c:710
#2  0xb77cb8dc in png_combine_row (png_ptr=0xb32fc018, row=0xb3205428 "", 
mask=136581672) at pnggccrd.c:720
#3  0xb5c8d655 in gst_pngdec_get_type () from 
/usr/lib/gstreamer-0.10/libgstpng.so
#4  0xb750aaa9 in gst_pad_chain_unchecked (pad=0x812ff18, buffer=0x815f9a0) at 
gstpad.c:3344
#5  0xb750b19b in gst_pad_push (pad=0x812fe58, buffer=0x815f9a0) at 
gstpad.c:3510
#6  0xb6cf6dbe in gst_queue_loop (pad=0x812fe58) at gstqueue.c:779
#7  0xb75228a6 in gst_task_func (task=0x81426e0, tclass=0x8140080) at 
gsttask.c:192

-- 
libpng segfault when thumbnailing movie
https://launchpad.net/bugs/76524

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