[mythtv-users] Frame by frame rewind problems

[Nick Rout]

On Tue, Dec 13, 2011 at 3:29 PM, Joey Morris <rjmorris at nc.rr.com> wrote:
> Christopher Peters <cpeters at ucmo.edu> wrote on Mon, Dec 12, 2011 at 04:34:29PM -0600:
>> I'm doing the rewinding via pausing then hitting the left arrow in order to rewind by 1 frame.
>
> Please don't top post on this list.
>
> I see the same behavior sometimes when rewinding frame-by-frame. A
> slightly earlier frame flashes briefly, followed by the intended
> frame. This is on 0.24.0-fixes using VDPAU. I see it in maybe half of
> the frame steps. It will do it for five or so frames in a row, then it
> will be fine for several more frames, then do it again for a few more
> frames, and so on. Stepping forward frame-by-frame never shows the
> behavior. Some quick experimentation leads me to suspect that the most
> recent keyframe is the one that flashes briefly before the intended
> frame is shown.

That makes sense, in that the system needs to process the keyframe in
order to understand the next frames - which are essentially only a
flash mathematical diff between the previous frame and the current
frame.