lavfi/pp: fixup for switch to AVFrame.
lavfi/swapuv: switch to AVFrame.
lavfi/life: switch to AVFrame.
lavfi/cellauto: switch to AVFrame.
lavfi/kerndeint: switch to AVFrame.
lavfi/histogram: switch to AVFrame.
lavfi/aconvert: switch to AVFrame
lavfi/asetnsamples: switch to AVFrame
lavfi/amerge: switch to AVFrame