Forum Post: TVP5158 line-mux capture with DM368 - line jumps at beginning of many super-frames

Hi,

We are trying to capture video from TVP5158 with DM368 VPFE. The format is 8-bit BT656 two channels D1 line-muxed at 54 Mhz. The DM368 is working in full capacity 432 Mhz ; DDR 340 Mhz ; VPSS 340 Mhz.

The cameras output PAL signal and super-frames are captured at around 28 FPS by the video capture module.

However, in many frames there are "line jumps" where the first line of one or both channels at the beginning of the super-frame does not match the expected continuous number from the previous frame.

These line jumps occur even if we do not encode or do anything in the program other than capturing the video and checking the line numbers in the super-frame.

Here is a typical summary of line jumps:

Demux Frame Line Jump CapIndex=603 CapLineIndex=1 Ch=0 From=287 To=254
Demux Frame Line Jump CapIndex=604 CapLineIndex=1 Ch=0 From=146 To=148
Demux Frame Line Jump CapIndex=605 CapLineIndex=1 Ch=0 From=40 To=42
Demux Frame Line Jump CapIndex=608 CapLineIndex=1 Ch=1 From=282 To=284
Demux Frame Line Jump CapIndex=609 CapLineIndex=0 Ch=0 From=242 To=137
Demux Frame Line Jump CapIndex=609 CapLineIndex=1 Ch=1 From=176 To=72
Demux Frame Line Jump CapIndex=611 CapLineIndex=0 Ch=0 From=287 To=31
Demux Frame Line Jump CapIndex=613 CapLineIndex=0 Ch=1 From=272 To=167
Demux Frame Line Jump CapIndex=613 CapLineIndex=1 Ch=0 From=287 To=233
Demux Frame Line Jump CapIndex=614 CapLineIndex=1 Ch=0 From=125 To=127
Demux Frame Line Jump CapIndex=617 CapLineIndex=0 Ch=1 From=261 To=61
Demux Frame Line Jump CapIndex=617 CapLineIndex=1 Ch=0 From=287 To=127
Demux Frame Line Jump CapIndex=618 CapLineIndex=0 Ch=1 From=287 To=156
Demux Frame Line Jump CapIndex=618 CapLineIndex=1 Ch=0 From=20 To=223
Demux Frame Line Jump CapIndex=619 CapLineIndex=1 Ch=0 From=115 To=117
Demux Frame Line Jump CapIndex=620 CapLineIndex=1 Ch=0 From=9 To=11
Demux Frame Line Jump CapIndex=622 CapLineIndex=1 Ch=1 From=250 To=252
Demux Frame Line Jump CapIndex=623 CapLineIndex=1 Ch=1 From=144 To=146
Demux Frame Line Jump CapIndex=627 CapLineIndex=0 Ch=1 From=240 To=135
Demux Frame Line Jump CapIndex=627 CapLineIndex=1 Ch=0 From=287 To=202

Can we fix this problem with configuration of the VPFE? or maybe the TVP?

Best regards,

Gadi Bergman