$ ~/src/ffmpeg/ffprobe -show_frames  str.bin  | grep pict_type
ffprobe version N-57933-g87434cf Copyright (c) 2007-2013 the FFmpeg developers
  built on Nov  5 2013 21:30:00 with gcc 4.7 (Ubuntu/Linaro 4.7.3-1ubuntu1)
  configuration:
  libavutil      52. 52.100 / 52. 52.100
  libavcodec     55. 41.100 / 55. 41.100
  libavformat    55. 21.100 / 55. 21.100
  libavdevice    55.  5.100 / 55.  5.100
  libavfilter     3. 90.102 /  3. 90.102
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
Input #0, hevc, from 'str.bin':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: hevc, yuv420p(tv), 352x288, 25 fps, 25 tbr, 1200k tbn, 25 tbc
pict_type=?
pict_type=?
pict_type=?
pict_type=?
pict_type=?


These are the frame types used:
$ ./TAppDecoderStatic -b str.bin

HM software: Decoder Version [12.1][Linux][GCC 4.7.3][64 bit]

POC    0 TId: 0 ( I-SLICE, QP 32 ) [DT  0.070] [L0 ] [L1 ] [:,,,(unk)]
POC    1 TId: 0 ( P-SLICE, QP 35 ) [DT  0.010] [L0 0 ] [L1 ] [:,,,(unk)]
POC    2 TId: 0 ( B-SLICE, QP 34 ) [DT  0.010] [L0 1 0 ] [L1 1 0 ] [:,,,(unk)]
POC    3 TId: 0 ( B-SLICE, QP 35 ) [DT  0.020] [L0 2 1 0 ] [L1 2 1 0 ] [:,,,(unk)]
POC    4 TId: 0 ( B-SLICE, QP 33 ) [DT  0.020] [L0 3 2 1 0 ] [L1 3 2 1 0 ] [:,,,(unk)]