(gdb) bt
#0  VaUngrabSurface (p_va=0x866d728, p_ff=0x869d490) at ../../../../modules/codec/avcodec/vaapi.c:434
#1  0xb3d690ec in ffmpeg_ReleaseFrameBuf (p_context=0x866d728, p_ff_pic=0x869d490) at ../../../../modules/codec/avcodec/video.c:1070
#2  0xb72a9e66 in MPV_common_end () from /usr/lib/libavcodec.so.52
#3  0xb2e3e6a0 in ?? ()
#4  0x0866d728 in ?? ()
#5  0xb2c99e68 in ?? ()
#6  0xb2e3b020 in ?? ()
#7  0x00000000 in ?? ()
(gdb) frame 0
#0  VaUngrabSurface (p_va=0x866d728, p_ff=0x869d490) at ../../../../modules/codec/avcodec/vaapi.c:434
434             if( p_surface->i_id == i_surface_id )