Sur d’autres sites (7849)

• ffmpeg : zoom a horizontal photo in a vertical video, fill the empty space at the top and bottom with a blurry photo

  23 octobre 2023, par Eugene Khyst

  I'm using ffmpeg to create a vertical video of zoomming a horizontal (landscape) photo.

  


  I want the photo to fit the width of the video, so the top and bottom of the photo need to fill the empty space with the blurry photo :

  


  

  


• avformat/matroskaenc : don’t reserve space for stream duration tags if the output...

  2 octobre 2016, par James Almer

  avformat/matroskaenc : don’t reserve space for stream duration tags if the output is not seekable
  The durations are never written in that situation.
  Reviewed-by : Michael Niedermayer <michael@niedermayer.cc>
  
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavformat/matroskaenc.c
  • [DH] tests/fate/matroska.mak
  • [DH] tests/fate/wavpack.mak
  • [DH] tests/ref/fate/binsub-mksenc

• How to pass through complex command line arguments in Process.Arguments ?

  5 juin 2015, par Louis de la Verité

  In C#, I have a complex set of arguments to pass through to Process.Arguments. I have circumvented the problem by using a one-line script of compiled Powershell. The exact "train" of arguments is :

  ffmpeg -framerate $fr -f image2 -i $temp\JPEG%01d -c:v libx264 -threads $threads -crf $encqual $video_out

  Problematic arguments are the -i (with the JPEG%01 pattern) & the -c argument. I have tried double escaping, but it’s not working any way I try. I don’t like the /<arg>: <val></val></arg> notation because it conflicts with the -c:v. As mentioned, I got it working by pass it off to PowerShell, but that’s a hack. The directory also gets parsed because it has spaces.

  ERROR :

  "Unable to find a suitable output format for ’C :\Program’
  "C :\Program" Invalid argument.

  CODE :

  Process proc = new Process();
  
  // proc.StartInfo = _fw.CreateProcessStartInfo4Ffmpeg(
  
        pathTempDir,    output);
  
  proc.StartInfo = _fw.CreateProcessStartInfo4AviGen(pathTempDir, output);
  
  proc.Start();
  
  
  
  // doesn't work yet
  
  public ProcessStartInfo CreateProcessStartInfo4Ffmpeg(string tempFile,
  
         string output)
  
  {
  
     string args = FormCmdArgsForFfmpeg(this, tempFile, output);
  
     ProcessStartInfo psi = CreateProcessStartInfo4Ffmpeg(this, args);
  
  return psi;
  
  }
  
  
  
  public static ProcessStartInfo CreateProcessStartInfo4Ffmpeg(
  
          FfmpegWrapper fw, string args)
  
   {
  
     string sExePath = clsRegistry.regInfo.FfmpegExePath;
  
     ProcessStartInfo pi = new ProcessStartInfo(sExePath);
  
  
  
     pi.UseShellExecute = false;
  
     pi.CreateNoWindow = false;
  
     pi.WindowStyle = ProcessWindowStyle.Normal;
  
  
  
     pi.Arguments = String.Copy(args);
  
     string sCmdFmtdMsg = string.Format("Command: ", 
  
             sExePath, pi.Arguments);
  
  return pi;
  
  } // end CreateProcessStartInfo4AviGen()
  
  
  
  // N.B. doesn't work yet; args prob
  
  public static string FormCmdArgsForFfmpeg(FfmpegWrapper fw, 
  
       string    tempDir, string output)
  
  {
  
   /* -framerate $framerate -f image2 -i $temp_dir_jpgs\JPEG%01d 
  
   -c:v libx264 -threads $threads -crf $encode_quality $video_out
  
   */
  
      string sFmtdArg2 = "-{0} \"{1}\" ";
  
      string sFmtdArg1 = "-{0} ";
  
      string sArgs = String.Empty;
  
      string sout = null;
  
      string pathInput = Path.Combine(tempDir, "JPEG%01d");
  
  
  
      StringBuilder sb = new StringBuilder("");
  
      sb.Append(string.Format(sFmtdArg2, "framerate", fw.framerate));
  
      sb.Append(string.Format(sFmtdArg2, "f", "image2"));
  
      sb.Append(string.Format(sFmtdArg2, "i", pathInput));
  
      sb.Append(string.Format(sFmtdArg2, "c:v", "libx264"));
  
      sb.Append(string.Format(sFmtdArg2, "threads", fw.threads) );
  
      sb.Append(string.Format(sFmtdArg2, "crf", fw.encode_quality));
  
      sb.Append(output);
  
      sout = sb.ToString();
  
  return sout;
  
  }