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questions about ti8148 interlaced

Other Parts Discussed in Thread: TVP5147

I'm used dvrrdk3.0 with custom board.

I capture from tvp5147 and encode ,then send data to vlc with internet.

The problem is how to reduce the delay.

Current I use the link : capture(interlaced  720x288) ---> dei(720x576) -----> encode---->a8---->vlc(720x576 on pc).

The delay is 1s to 2s.

If i use the link: capture(interlaced 720x288)------->encode(720x288) -------->a8----->vlc(720x288 on pc).

The delay is under 300ms.

I want the vlc to show 720x576 and the delay is under 300ms.

What link should i use?