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• How do websites render custom videos programatically ?

  18 juillet 2020, par Eric Smith

  I've noticed a number of websites such as https://biteable.com, https://animoto.com/apps/online-video-maker, etc. that are essentially online video editors that allow users to apply effects, add custom text, etc. and render a video as a result.

  


  I've done a bit of research but can't find any high-level answers on how these websites accomplish creating videos programmatically. I've seen mention of "FFmpeg", but this seems like it would only be able to accomplish basic tasks such as converting a series of images into a video (am I wrong ?).

  


  I know very little about video rendering and was hoping someone had an idea to get me started in my research. Are there libraries that exist that can aid to accomplish what these websites are doing ? Or are these websites starting from the ground up with lower-level languages to accomplish this ?

  


• ffmpeg rotate 2 videos and create split

  1er juillet 2023, par Евгений Федоров

  I have 2 videos and i need to rotate them and create split video of both

  


  Video 1

  


  

  


  Video 2

  


  

  


  Both videos are same resolution and FPS.
In the and I want to get this (first video rotated on 90 and second on 270 degrees)

  


  

  


  How to correctly specify arguments in filter complex for ffmpeg ?

  


  Right now I use the following arguments, but I'm not sure how to specify rotation angle correctly

  


  var outputFile = Path.Combine(folder,  "result.mp4");
            var leftSideFile = @"left.mp4";
            var rightSideFile = @"right.mp4";

            var inputArgs = string.Format("-i \"{1}\" -i \"{2}\" -filter_complex  [0:v]pad=iw*2:ih[int];[0]rotate=PI/2;[int][1:v]overlay=W/2:0[vid] -map [vid] -c:v libx264 -crf 0 -preset veryfast \"{0}\"", outputFile, leftSideFile, rightSideFile);

            var mergeVideos = new Process
            {
                StartInfo =
                            {
                            FileName = ffmpegPath,
                            Arguments = $"{inputArgs}",
                            UseShellExecute = false,
                            CreateNoWindow = false,
                            RedirectStandardInput = true
                            }
            };
            mergeVideos.Start();
            mergeVideos.WaitForExit();


  


  How do I need specify the rotation degree arguments for the first and second video and get the desired result ?

  


• Révision 24662 : réparer le super_cron en https

  23 août 2020, par bruno@eliaz.fr

  super_cron, il est super, mais un peu cron cron en https :p

  report de 542730b44f71bc6395aa43e80f8b0a12a22215db & fix #4345