Comment 2 for bug 275565

StacktraceTop:QueueMsg (p_this=0x0, i_type=0, psz_module=0x4768b040 "��hG",
LibavutilCallback (p_opaque=0x2565700, i_level=<value optimized out>,
av_log (avcl=0x0, level=2, fmt=0x7f470dbb15a9 "avcodec")
h263_decode_block (s=0x0, block=0x2, n=1, coded=0)
ff_h263_decode_mb (s=0x0, block=0x2)