ffmpeg_renderer doesn't respect pause at end of animation.

[JoFAM]

When using ffmpeg_renderer(), the added frames using end_pause aren't added to the video. An example:

library(ggplot2)
library(gganimate)

anim <- ggplot(mtcars, aes(x = wt, y = mpg)) +
  geom_point() +
  transition_states(cyl)

anim_save("ffmpegrend.mp4",
       anim,
       renderer = ffmpeg_renderer(),
       nframes = 20 + 100,
       fps = 10, end_pause = 100)

anim_save("avrend.mp4",
       anim,
       renderer = av_renderer(),
       nframes = 20 + 100,
       fps = 10, end_pause = 100)

anim_save("gifskirend.gif",
          anim,
          nframes = 20 + 100,
          fps = 10, end_pause = 100)

This is with gganimate 1.0.6 on R 4.0.2, Windows 10.
ffmpeg version: 4.3.1-full_build-www.gyan.dev

[thomasp85]

Weird - the end pause logic happens before the specific renderer so frames are getting rendered for it. I wonder if ffmpeg has some optimisation step that removes duplicate frames (would be bad, IMO)

In general I would recommend using AV to interface with ffmpeg though - does the issue arise there as well?