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

  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.

  


• C# EmbedIO server : Only the first request is working trying to live stream from FFMPEG

  7 octobre 2017, par Connum

  I’m trying to build an HTTP server that will stream dynamic video/audio in the TransportStream format via FFMPEG. I found EmbedIO and it looks like a lightweight yet flexible base for this.

  So, I looked at the module examples and built a very basic module that doesn’t yet handle the request URL at all but responds with the same stream for any request, just to see whether it’s working as intended :

  namespace TSserver
  
  {
  
      using Unosquare.Swan;
  
      using Unosquare.Swan.Formatters;
  
      using System;
  
      using System.Collections.Generic;
  
      using System.IO;
  
      using System.Threading;
  
      using System.Threading.Tasks;
  
  #if NET46
  
      using System.Net;
  
  #else
  
      using Unosquare.Net;
  
      using Unosquare.Labs.EmbedIO;
  
      using Unosquare.Labs.EmbedIO.Constants;
  
      using System.Diagnostics;
  
  #endif
  
  
  
      /// <summary>
  
      /// TSserver Module
  
      /// </summary>
  
      public class TSserverModule : WebModuleBase
  
      {
  
          /// <summary>
  
          /// Initializes a new instance of the <see cref="TSserverModule"></see> class.
  
          /// </summary>
  
          /// The base path.
  
          /// The json path.
  
          public TSserverModule()
  
          {
  
              AddHandler(ModuleMap.AnyPath, HttpVerbs.Any, HandleRequest);
  
          }
  
  
  
          /// <summary>
  
          /// Gets the Module's name
  
          /// </summary>
  
          public override string Name => nameof(TSserverModule).Humanize();
  
  
  
  
  
          /// <summary>
  
          /// Handles the request.
  
          /// </summary>
  
          /// The context.
  
          /// The cancellation token.
  
          /// <returns></returns>
  
          private Task<bool> HandleRequest(HttpListenerContext context, CancellationToken ct)
  
          {
  
              var path = context.RequestPath();
  
              var verb = context.RequestVerb();
  
  
  
              System.Net.HttpStatusCode statusCode;
  
              context.Response.SendChunked = true;
  
              //context.Response.AddHeader("Last-Modified", File.GetLastWriteTime(filename).ToString("r"));
  
              context.Response.ContentType = "video/mp2t";
  
  
  
              try
  
              {
  
                  var ffmpeg = new Process
  
                  {
  
                      StartInfo = new ProcessStartInfo
  
                      {
  
                          FileName = "ffmpeg.exe",
  
                          Arguments = "-re -loop 1 -i \"./default.png\" -i \"./jeopardy.mp3\" -c:v libx264 -tune stillimage -r 25 -vcodec mpeg2video -profile:v 4 -bf 2 -b:v 4000k -maxrate:v 5000k -acodec mp2 -ac 2 -ab 128k -ar 48000 -f mpegts -mpegts_original_network_id 1 -mpegts_transport_stream_id 1 -mpegts_service_id 1 -mpegts_pmt_start_pid 4096 -streamid 0:289 -streamid 1:337 -metadata service_provider=\"MYCALL\" -metadata service_name=\"My Station ID\" -y pipe:1",
  
                          UseShellExecute = false,
  
                          RedirectStandardOutput = true,
  
                          CreateNoWindow = true
  
                      }
  
                  };
  
  
  
                  ffmpeg.Start();
  
  
  
                  FileStream baseStream = ffmpeg.StandardOutput.BaseStream as FileStream;
  
                  int lastRead = 0;
  
                  byte[] buffer = new byte[4096];
  
  
  
                  do
  
                  {
  
                      lastRead = baseStream.Read(buffer, 0, buffer.Length);
  
                      context.Response.OutputStream.Write(buffer, 0, lastRead);
  
                      context.Response.OutputStream.Flush();
  
                  } while (lastRead > 0);
  
  
  
                  statusCode = System.Net.HttpStatusCode.OK;
  
              }
  
              catch (Exception e)
  
              {
  
                  statusCode = System.Net.HttpStatusCode.InternalServerError;
  
              }
  
  
  
              context.Response.StatusCode = (int)statusCode;
  
              context.Response.OutputStream.Flush();
  
              context.Response.OutputStream.Close();
  
  
  
              return Task.FromResult(true);
  
          }
  
  
  
      }
  
  }
  
  </bool>

  This does indeed work, when I open a connection in a browser, a TS file is offered for download, when I connect via VLC Player, I see my default.png file accompanied by the Jeopardy think music - yay ! However, if I connect a second client (player or browser) it will just load endlessly and not get anything back. Even if I close the previous connection (abort the download or stop playback), no subsequent connection will result in any response. I have to stop and start the server again in order to be able to make one single connection again.

  It seems to me that my code is blocking the server, despite being run inside a Task of its own. I’m coming from a PHP & JavaScript background, so I’m quite new to C# and threading. So this might be pretty obvious... But I hoped that EmbedIO would handle all the multitasking/threading stuff.

• 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.