[Libav-user] Field order

[Nisar Ahmed]

While decoding, libav is producing a different field order for some movies
which is resulting in interlacing artefacts on the output screen. I tried
finding field order information inside AVCodecContext->field_order and
AVFrame->top_field_first but both values are always set to AV_FIELD_BT and
0 respectively.

I need to know which field order then file will decode with so that I can
make conversion or can I ask libav to do that.

Please help
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