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DM8148. H264 from file decode and display

Hello TI' teams,

I'm working with IVAHD/DECODER and try to decode H264 elementary stream from file and display on HDMI and on SD display.

SD display show correct decoded image but on HDMI I don't see any picture - black screen.

In display statistics I saw next:

[m3vpss ]  21798: DISPLAY: UNDERFLOW COUNT: HDMI(BP0) 858, HDDAC(BP0) 0, DVO2(BP1) 858, SDDAC(SEC1) 5


Please let me know what is reason for UNDERFLOW count on HDMI display, is this problem?