[FFmpeg-user] How are ffmpeg internal frames structured?

[Mark Filipak (ffmpeg)]

[decoder] --> [filters] --> [codecs] --> [encoder]

My question is:
How are docoder.output and encoder.input structured?

Yes, I know that filters can reformat the video, deinterlace, stack fields, etc.

I have been assuming that the structure is frames of pixels like this:
pixel[0,0] pixel[1,0] ... pixel[in_w-1,0] pixel[0,1] pixel[1,1] ... pixel[in_w-1,in_h-1]
In other words, raw video frames with lines abutted end-to-end (i.e. not deinterlaced).

Am I correct?

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