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• Split text in lines ffmpeg based on font and text length

  8 janvier 2018, par Iura Gaitur

  How can I calculate when to put a new line based on text length and font
  using function drawText from ffmpeg.
  For example if i have a long text that I want to place it at bottom in the video and it needs to take how much place it needs.

  drawtext=enable='between(t,0,18)':fontfile=font_simple.ttf:text='Here 
  
  is a veeeeeeery loooong long text so I must somehow split it in 
  
  multiple lines': fontcolor=white:shadowcolor=black:shadowx=1:shadowy=1: 
  
  fontsize=25: x=(w-text_w)/1.07: y=30

• I am able to write certain metadata information to a .m4v file but not all using ffmpeg

  14 janvier 2014, par user3193123

  For example use this code

  ffmpeg -i avatar.m4v -metadata title="Avatar" -metadata artist="James Cameron" -metadata     description="Long Long Ago…" acodec copy -vcodec copy -y /Users/Anand/Desktop/anand.m4v

  Works perfectly fine !!!

  But i am not able to write metadata information such as Rating, Actors(Cast), Producers etc.. because i dont know the keywords or the keywords don't exist ?

  Any body know the keyword for them or can't i write them ?

• How to remove a specific segment from an audio file using timestamps ? [closed]

  9 février, par Hilal Khan

  I am working on a C# project where I need to remove a specific segment from an audio file (e.g., WAV, MP3) based on start and end timestamps, while keeping the rest of the audio intact.

  


  For example, given a 20-minute audio file, I want to remove the section from 17:00 to 19:00 and be left with a new audio file containing only 0:00-17:00 and 19:00-20:00 (i.e., keeping the parts before and after the cut).

  


  I have used NAudio and FFmpeg to trim a file by cutting from the start or end, but I only get my desired snippet as a separate file which is not what I am looking for as I want it to be removed from the audio itself

  


  Heres what I have so far :

  


  static void RemoveSegment(string inputPath, string outputPath, double startTime, double endTime)
{
    using (var reader = new Mp3FileReader(inputPath))
    {
        var writer = new FileStream(outputPath, FileMode.Create, FileAccess.Write);

        int bytesPerMillisecond = reader.WaveFormat.AverageBytesPerSecond / 1000;
        long startPosition = (long)(startTime * 1000) * bytesPerMillisecond;
        long endPosition = (long)(endTime * 1000) * bytesPerMillisecond;

        byte[] buffer = new byte[4096];
        int bytesRead;

        while ((bytesRead = reader.Read(buffer, 0, buffer.Length)) > 0)
        {
            if (reader.Position < startPosition || reader.Position > endPosition)
            {
                writer.Write(buffer, 0, bytesRead);
            }
        }

        writer.Close();
    }

    Console.WriteLine("Segment removed successfully!");
}