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• Why can I not change the number of frames (nframes) in a gganimate animation ? SOLVED

  26 décembre 2022, par Gekin

  I have produced an animation per gganimate and rendered it per ffmpeg. It works just fine, but only, if I do not change the number of frames. If I do set the number of frames, I get this error message :

  


  nframes and fps adjusted to match transition
Error parsing framerate 8,4.                           
Error: Rendering with ffmpeg failed


  


  I produced the gganim MonthlyAveragePrecipitationMap the following way :

  


  options(scipen = 999, OutDec  =  ",")

MonthlyAveragePrecipitationMap = ggplot(MonthlyAverageExtremePrecipitation) + 
  geom_path(data = map_data("world","Germany"),
            aes(x = long, y = lat, group = group)) +
  coord_fixed(xlim = c(6,15),
              ylim = c(47,55)) + 
  geom_point(aes(x=lon, y=lat, 
                 colour = ShareOfExtremePrecipitationEvents,
                 group = MonthOfYear),
             size = 3) + 
  scale_color_gradient(low="blue", high="yellow") + 
  xlab("Longitude (degree)") +
  ylab("Latitude (degree)") + 
  theme_bw() +
  transition_manual(frames = MonthOfYear) + 
  labs(title = '{unique(MonthlyAverageExtremePrecipitation$MonthOfYear)[as.integer(frame)]}', 
       color = paste0("Share of Extreme Precipitation Events \namong all Precipitation Events")) 


  


  I call the animation the following way :

  


  animate(MonthlyAveragePrecipitationMap,
        nframes = 300,
        renderer =
          ffmpeg_renderer(
            format = "auto",
            ffmpeg = NULL,
            options = list(pix_fmt = "yuv420p")))



  


  I used this exact code just a few days ago and it worked fine.

  


  Has someone had similar experiences ?
Thanks in advance.

  


  EDIT : Problem solved.

  


  

  • Problem : Changing the decimal seperator from . to , per options(dec=",")

  


  • Solution : Changing the decimal seperator locally within the axis scaling per function.

  


  


• FFmpeg large input frames

  2 juillet 2015, par user3310761

  I have a problem that I cannot solve and I would really appriciate your help.

  I have large rgb24 frame (1M each) which i would like to stream to ffmpeg and convert them to mpegts h264 stream.

  Now, I know which arguments I need to supply to ffmpeg so the conversion will success, but I don’t have a clue how can I stream/provide the frames to ffmpeg since they are too large for udp and I can’t using files. ( It’s a demonstrate of a real time streaming).

  Thank for all the helpers It’s really important for me !

• Encode images on the fly into an mp4 video using ffmpeg

  14 décembre 2017, par Kushagra

  I was wondering if there’s a way where I can append images at the end of video. I’m capturing an image every 10th frame and approximately after 10 seconds I want all the images captured encoded into a video. I tried the traditional way of saving all the captured images and then running the //-y -i .../image%1d.jpg -r 30 video.mp4 ffmpeg command but this takes like 15-20 seconds on Android, not tested iOS yet. Wondering if there’s a way where I can encode these images on the fly to be part of one single video output ? I’ve been googling for the last couple of days but none of the solution I’ve seen so far has worked for me. Also, in all of this, there is no audio involved at all.

  Note : I’m working only with Android and iOS using Unity and I’m looking for high performance encoding.

  If you know of any other codec that can be used to achieve this let me know that as well