ATSC decode

Hi all,
I am new with GNUradio and USRP.
I am using the atsc to decode hdtv but I have no luck.I get some sync
errors
from btl-fds.py

gr_fir_fff: using SSE
atsc_field_sync_demux: synced (FIELD-1) at 426606 [delta = 426606]
!!! atsci_equalizer: expected field sync, didn’t find one
atsc_field_sync_demux: segment number overflow
!!! atsci_equalizer: expected field sync, didn’t find one
atsc_field_sync_demux: segment number overflow
!!! atsci_equalizer: expected field sync, didn’t find one
atsc_field_sync_demux: segment number overflow
!!! atsci_equalizer: expected field sync, didn’t find one
atsc_field_sync_demux: segment number overflow
!!! atsci_equalizer: expected field sync, didn’t find one
atsc_field_sync_demux: segment number overflow
!!! atsci_equalizer: expected field sync, didn’t find one
atsc_field_sync_demux: segment number overflow
!!! atsci_equalizer: expected field sync, didn’t find one
atsc_field_sync_demux: segment number overflow
!!! atsci_equalizer: expected field sync, didn’t find one
atsc_field_sync_demux: segment number overflow
!!! atsci_equalizer: expected field sync, didn’t find one
atsc_field_sync_demux: segment number overflow
!!! atsci_equalizer: expected field sync, didn’t find one
atsc_field_sync_demux: segment number overflow

I get an output from the viterbi-out.py but I can not pla the output
mpeg
file with mplayer.
Can you help me please with this situation.
Thank you
I use the readme from gnuradio/gr-atsc/src/python to decode