Jun Li (12019-05-10): > I think now I understand what you mean"lavfi does not support real > reconfiguration of the stream properties. " > Even we have a perfect filter for this case, we still have to dynamic > turn on/off the filter per frame's metadata.
No, that is not what I meant: there is nothing to turn on or off if the filters itself examines the frame metadata. The problem is that if a filter does that, it can switch from outputting 1920×1080 to 1080×1920 when the orientation changes. Most filters and the framework do not support that. > Then I just wonder maybe we just need a function to rotate/flip the frame > data, rather than using filter ? Do you mind sharing some advice ? That would not change anything, since it was for the wrong problem. Regards, -- Nicolas George
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