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• Best solution to automatically enrich a video stream with dynamic overlay (text, images, ...)

  17 novembre 2016, par hg.m

  In my company, we are currently looking for a solution to enrich a given video stream (which is being broadcasted via RTMP) from a remote webcam with dynamic information, such as current date/time, special measure values which are available on a server or the most recent entries in a database. Basically we want to achieve a simple, dynamic on-screen display as, for example, TV stations are using. The modified stream should then be restreamed, for example to be viewed in VLC Player or on YouTube.

  So far, I came up with the following ideas :

  • Using OBS with some own scripts and plugins - that’s disadvantageous because we would like to run the solution on a high-network performance server 24/7 without a GUI. Basically I’d need a fully command-line based version of OBS.

  • Using ffmpeg : I know that there are text filters available, but they are mainly static (or periodically polling a file with text) and don’t allow for any design adjustments other than font, font size and color. It would be great if there was some way of overlaying a Webkit browser view onto the stream, because this would allow us to design the overlays in HTML5 and CSS and using WebSocket technology for updating the data.

    • The overlay could be captured with PhantomJS, but how should we unify it with the stream and would it be fast enough to render 30 FPS ?

  Are there additional (preferably open source) tools we could use ? What would be the best strategy to implement this without buying expensive TV broadcasting software ?

• ffmpeg - How to antialias webp/gif

  19 août 2019, par theParanoidAndroid

  I am trying to use ffmpeg to produce an animated GIF/WEBP from a set of pngs. However, the output images have jagged edges that I would like to smooth out somehow.

  The set of PNGs are of a rotating sphere, outputted from Blender. Here is one of the images (cropped to the edge to hide a company logo)

  

  However, when using the following commands :

  ffmpeg -i frames/%%4d.png -vf palettegen -y palette.png
  
  ffmpeg -v warning -i frames/%%4d.png -i palette.png -lavfi "paletteuse,setpts=PTS" -y out.gif
  
  ffmpeg -v warning -i frames/%%4d.png -y out.webp

  to generate .gif and .webp animations, the edges becomes jagged :

  

  I can’t convert to .mkv and back or something, as transparency has to be preserved.

  Can anyone help ?

• How to extract Images from MP4 video on upload - FFMPEG

  11 février 2015, par michael hanon

  I am putting together a training site for my company and we need to extract an image from each mp4 video we upload. I have searched lots and decided to try FFMPEG.

  Here is what I have so far. I’m not getting errors, but no image in the specified folder.

  Any help would be appreciated.

             string inputfile = Server.MapPath("/Report/TrainingLibrary/Material/Videos/RMSIMAILSignature.mp4");
           //string withouttext;
           string thumbpath;
           string thumbname;
           string thumbargs;
           //string thumbre;
          thumbpath = AppDomain.CurrentDomain.BaseDirectory + "Reports\\ TrainingLibrary\\Material\\Videos\\";
           thumbname = thumbpath + "Image" + "%d" + ".jpg";
           thumbargs = "-i " + inputfile + " -vframes 1 -ss 00:00:07 -s 150x150 " + thumbname;
           Process thumbproc = new Process();
           thumbproc = new Process();
           thumbproc.StartInfo.FileName = "C:\\FFMPEG\\Bin\\ffmpeg.exe";
           thumbproc.StartInfo.Arguments = thumbargs;
           thumbproc.StartInfo.UseShellExecute = false;
           thumbproc.StartInfo.CreateNoWindow = false;
           thumbproc.StartInfo.RedirectStandardOutput = false;
           try
           {
               thumbproc.Start();
           }
           catch (Exception ex)
           {
               Response.Write(ex.Message);
           }
           thumbproc.WaitForExit();
           thumbproc.Close();