[FFmpeg-user] Reducing frame rate without reencoding

[Sven C. Dack]

On 27/10/16 01:47, Ronald F. Guilmette wrote:
> Is each frame within, say, an MPEG4/AVC video dependent upon -both- the
> nearest preceeding reference frame -and- also the other non-reference
> preceeding frames ?

Not necessarily, but it can, yes. It can also reference data in succeeding frames.

https://en.wikipedia.org/wiki/Inter_frame