about dm8168 hdvpss, Why not sync？

ce_w

Other Parts Discussed in Thread: TVP5158

my platform is dm8168+TVP5158, based on DVRRDK4.0.

now, dsp need receive two channels(eg:ch0, ch1, ch0 ch1 connect the same TVP5158) video data that from TVP5158 in the same time. so check (struct System_FrameInfo) ts64, use

t = ch1->ts64 - ch0->ts64, why t is variable from 0 to -40ms.

theoretically it (pixel interlaced)should be the same time sampling data, and then transferred to the DM8168，but t>10ms, my alg process ch0 and ch1 result is very bad, t=0ms, the result is good， Why is it so？

my alg need ch0 ch1 sync completely, How can we do？

over 11 years ago

0 Brijesh Jadav over 11 years ago

TI__Guru**** 475745 points

Hi,

Sampling time is same since they use same clock, but vsync could be different since they are coming in from different camera which are not synchronized. TVP5158 does not have any method to make then in sync, this has to be done outside.

Once their vsync are in sync, you could get the captured frame almost at the same time.

Rgds,

Brijesh

0 Badri Narayanan over 11 years ago in reply to Brijesh Jadav

TI__Guru 59700 points

Try using an external 1:N splitter and feed the same camera source to both channels .This will confirm timing difference is from the camera

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about dm8168 hdvpss, Why not sync？