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USRP TX/RX. Lost bytes and "U" in flowgraph execution

Hello everybody  move your body


I have the flowgraph below PIC 1 (01_flowgraph)
USRP transmits file (txt, picture and video) and receives this file at the same time ( it is working flowgraph and you can use it free:) )
Transmitted video is received without some bytes and i see letters "U". PIC 1 and PIC 2 at gnuradio terminal

1. What do this letters "U" mean?
1* I think there are anothers error letters. Where can i know about it?
2. I don't know on what it (letters) depends, but when i have 3 or more "U", video  doesn't play (but despite the lack of few bytes and 3 "U" received picture is displayed normal). Why?
3. Why I lost my bytes? PIC 2 (lost_bytes)

i use gnuradio 3.6.5 with GNOME.

if you want to answer please do it considering i new in gnuradio and usrp:)

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