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• Videos encoded by FFMPEG (mpeg codec) cannot be played on iOS14

  28 septembre 2020, par vanste25

  I have a piece of code that uses ffmpeg with default mpeg codec to merge multiple videos and audio songs.

  


  ffmpeg -i input1.mp4 -i input2.mp4 -filter_complex "concat=n=2:v=1:a=1" -f MOV -vn -y output.mp4


  


  Everything worked on iOS13 and after the update to iOS14, videos are black and cannot be played by any player. Sound is there and it's good.
I tried to switch to h264 and it works good, but as you already know, h264 is under GPL and it is expensive and requires code to be open sourced which is not acceptable for me.

  


  What was changed ? Anything in release notes ?
Is that a bug ? Or a feature ?

  


  Thanks

  


• can we play ffplay videos continuously ? [closed]

  19 avril 2021, par Eswar T

  My requirement is to play ffplay videos as they are joined
I do know we can play the one after the other using

  


  ffplay -i 1.mp4 && ffplay -i 2.mp4


  


  but here using this method a tab is being opened for each video and I need close to starting playing video some query is there a way to day them directly without this opening and closing tabs

  


  Hope my query is clear
Thank you

  


  I want to play edited videos how we can do with ffplay

  


  ffplay -i 1.mp4 -ss 00:00:30.100 -t 00:00:10 -af volume=2.0,atempo=2.0-vf transpose=0,transpose=0,setpts=1/0.5*PTS,fps=30) && ffplay -i 2.mp4 -ss 00:00:30.100 -t 00:00:10 -af volume=2.0,atempo=2.0-vf transpose=0,transpose=0,setpts=1/0.5*PTS,fps=30)


  


• Merge videos in c# asp.net using ffmpeg

  3 juillet 2012, par Arun Kumar

  Is it possible to merge the two videos by c# asp.net with the help of ffmpeg. In the ffmpeg documentation they gave us cat command. But it wont works in asp.net. I thought it only for linux.

  cat intermediate1.mpg intermediate2.mpg > intermediate_all.mpg

  asp.net execute this command but there is no output. Help me.

  namespace demo
  
  {
  
      public partial class Default : System.Web.UI.Page
  
      {
  
          protected void Button2_Click(object sender, EventArgs e)
  
          {
  
              string strFile = "cars1.flv";
  
              MergeFiles(strFile);
  
          }
  
  
  
          public void MergeFiles(string strFile)
  
          {
  
              string strParam;
  
              string Path_FFMPEG = Server.MapPath("~/ffmpeg/bin/ffmpeg.exe");
  
  
  
              //Converting a video into mp4 format
  
              string strOrginal = Server.MapPath("~/Videos/");
  
              strOrginal = strOrginal + strFile;
  
              string strConvert = Server.MapPath("~/Videos/ConvertedFiles/");
  
              string strExtn = Path.GetExtension(strOrginal);
  
              if (strExtn != ".mp4")
  
              {
  
                  strConvert = strConvert + strFile.Replace(strExtn, ".mp4");
  
                  strParam  = "-i " + strOrginal + " " + strConvert;
  
                  //strParam = "-i " + strOrginal + " -same_quant " + strConvert;
  
                  process(Path_FFMPEG, strParam);
  
              }
  
  
  
              //Merging two videos               
  
              String video1 = Server.MapPath("~/Videos/Cars1.mp4");
  
              String video2 = Server.MapPath("~/Videos/ConvertedFiles/Cars2.mp4");
  
              String strResult = Server.MapPath("~/Videos/ConvertedFiles/Merge.mp4");
  
              //strParam = "-loop_input -shortest -y -i " + video1 + " -i " + video2 + " -acodec copy -vcodec mjpeg " + strResult;
  
  
  
              strParam = " -i " + video1 + " -i " + video2 + " -acodec copy -vcodec mjpeg " + strResult;
  
  
  
              process(Path_FFMPEG, strParam);
  
          }
  
  
  
          public void process(string Path_FFMPEG, string strParam)
  
          {
  
              try
  
              {
  
                  Process ffmpeg = new Process();
  
                  ProcessStartInfo ffmpeg_StartInfo = new ProcessStartInfo(Path_FFMPEG, strParam);
  
                  ffmpeg_StartInfo.UseShellExecute = false;
  
                  ffmpeg_StartInfo.RedirectStandardError = true;
  
                  ffmpeg_StartInfo.RedirectStandardOutput = true;
  
                  ffmpeg.StartInfo = ffmpeg_StartInfo;
  
                  ffmpeg_StartInfo.CreateNoWindow = true;
  
                  ffmpeg.EnableRaisingEvents = true;
  
                  ffmpeg.Start();
  
                  ffmpeg.WaitForExit();
  
                  ffmpeg.Close();
  
                  ffmpeg.Dispose();
  
                  ffmpeg = null;
  
              }
  
              catch (Exception ex)
  
              {
  
  
  
              }
  
          }
  
  
  
      }
  
  }