Hello all,

I'm writing a filter, using the libavfilter framework, which swaps field order.

However I cannot determine if an input file is Progressive, top field first or bottom field first.
Nor do I know how to set these flags.

None of the example code mentions interlace.

A Google search appears to turn up problems with people compiling the library more than specifically interlace related code.
I found one page mentioning it was on a todo list.

Are these flags implemented?

Thanks
Mark
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