FFMPEG Blocking Thread

PerfTop:     975 irqs/sec  kernel: 0.3%  exact:  0.0% [1000Hz cycles],  (target_tid: 13580)
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    15.96%  libx264.so.124      [.] x264_macroblock_tree_propagate
    13.79%  libx264.so.124      [.] x264_slicetype_mb_cost.isra.20
    12.90%  libx264.so.124      [.] x264_pixel_avg2_w8_mmx2
    10.59%  libx264.so.124      [.] x264_pixel_satd_8x8_internal_xop
     8.48%  libx264.so.124      [.] x264_me_search_ref
     6.75%  libx264.so.124      [.] get_ref_sse2_misalign
     6.49%  libx264.so.124      [.] refine_subpel
     5.61%  libx264.so.124      [.] x264_pixel_sad_x4_8x8_sse2
     3.00%  libx264.so.124      [.] x264_pixel_sad_8x8_mmx2
     2.71%  libx264.so.124      [.] x264_mc_copy_w8_mmx
     1.80%  libx264.so.124      [.] x264_pixel_satd_8x8_xop
     1.73%  libx264.so.124      [.] x264_intra_satd_x3_8x8c_ssse3
     1.63%  libx264.so.124      [.] x264_pixel_avg2_w16_sse2
     1.35%  libx264.so.124      [.] x264_mbtree_propagate_cost_fma4
     0.88%  libx264.so.124      [.] x264_pixel_avg_w8_mmx2
     0.67%  libx264.so.124      [.] x264_predict_8x8c_p_core_avx
     0.56%  libx264.so.124      [.] x264_hadamard_load
     0.51%  libx264.so.124      [.] x264_predict_8x8_ddl_avx
     0.47%  libx264.so.124      [.] x264_slicetype_frame_cost
     0.47%  libx264.so.124      [.] x264_mc_weight_w8_ssse3
     0.41%  libx264.so.124      [.] x264_pixel_avg_weight_w8_ssse3
     0.38%  libx264.so.124      [.] x264_predict_8x8_hu_ssse3
     0.31%  libx264.so.124      [.] x264_weight_cost_luma
     0.25%  libx264.so.124      [.] x264_predict_8x8c_p_avx
     0.22%  libx264.so.124      [.] x264_predict_8x8_vr_avx
     0.22%  libx264.so.124      [.] x264_predict_8x8_hd_avx
     0.20%  libc-2.15.so        [.] 0x8bfa4
     0.18%  libx264.so.124      [.] x264_macroblock_tree_finish.isra.22
     0.17%  libx264.so.124      [.] x264_predict_8x8_filter_ssse3
     0.17%  libx264.so.124      [.] x264_predict_8x8_vl_avx
     0.16%  libx264.so.124      [.] x264_mc_weight_w16_ssse3
     0.13%  libx264.so.124      [.] x264_predict_8x8_ddr_avx
     0.12%  libx264.so.124      [.] x264_pixel_avg_8x8_ssse3
     0.11%  libx264.so.124      [.] x264_mc_offsetadd_w8_mmx2
     0.08%  libx264.so.124      [.] x264_mc_chroma_avx
     0.05%  libx264.so.124      [.] x264_plane_copy_deinterleave_ssse3
     0.05%  libx264.so.124      [.] x264_macroblock_tree
     0.04%  libx264.so.124      [.] x264_pixel_asd8_ssse3
     0.03%  libx264.so.124      [.] mc_luma_sse2
     0.03%  libx264.so.124      [.] x264_weight_cost_chroma.isra.17
     0.03%  libx264.so.124      [.] x264_mc_offsetsub_w8_mmx2