libavcodec/h264.c:1590: error: Uninitialized Value
  The value read from context_count was never initialized.

libavcodec/h264.c:1590:9: 
1588.     }
1589.     if (context_count)
1590.         ff_h264_execute_decode_slices(h, context_count);
              ^
1591. 
1592. end:
