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• Precise image overlay over video using ffmpeg

  22 août 2017, par Sunny Tambi

  I want to overlay various icon-images over a given video (which is created using the sequence of images) in a time and position precise manner. I am using FFmpeg for the same.
  Here are the commands I am using :

  Image to video conversion command

  ffmpeg -framerate 5 -start_number 0 -i images/img%04d.png -vframes 1000 -r 30 -vcodec libx264 -crf 25  -pix_fmt yuv420p out.mp4 -y

  Images superimpose over video command

  ffmpeg -analyzeduration 10000 -hwaccel auto -i out.mp4 -i icons/up.png -i icons/down.png -i icons/left.png -i icons/right.png -i icons/top.png -i icons/bottom.png -i icons/side.png -filter_complex [0:v]setpts=PTS-STARTPTS[0];
  
  [1:v]setpts=PTS-STARTPTS[i1];
  
  [2:v]setpts=PTS-STARTPTS[i2];
  
  [3:v]setpts=PTS-STARTPTS[i3];
  
  [4:v]setpts=PTS-STARTPTS[i4];
  
  [5:v]setpts=PTS-STARTPTS[i5];
  
  [6:v]setpts=PTS-STARTPTS[i6];
  
  [0][i1]overlay=211.875:319.916:enable='between(t,0.610,0.910)'[1];
  
  [1][i2]overlay=212.344:309.516:enable='between(t,1.810,2.110)'[2];
  
  [2][i3]overlay=37.969:332.396:enable='between(t,2.775,3.075)'[3];
  
  [3][i4]overlay=202.500:307.436:enable='between(t,3.626,3.926)'[4];
  
  [4][i5]overlay=37.734:296.203:enable='between(t,4.531,4.831)'[5];
  
  [5][i6]overlay=208.359:313.676:enable='between(t,5.602,5.902)'[6];
  
  [6][i7]overlay=34.688:383.150:enable='between(t,6.733,7.033)'[7];
  
  -map [7] -y -movflags +faststart superimposed.mp4

  My problem is that I am not getting precision in time. i.e. if there is an icon to be overlayed at 0.61 sec, it doesn’t come exactly at 0.61 sec. Sometimes it comes at 1.0 sec, sometimes at 0.30 sec and sometimes at some other unpredictable time.

  I have an HTML5 video player where the user is allowed to seek the video with 100-millisecond precision. The user expects the icon to see precisely at 0.61 sec. However, above inaccuracy limits the capabilities of my video player.

  Please suggest what could be wrong in my implementation/command.

• Gradient is bad in video [closed]

  1er juillet 2023, par Andres Miguel Campos

  I'm trying to capture a css animation with gradient. But when capturing the video I get a bad quality

  


  I have used the following css for the screen

  


  


  


  &#xA;&#xA;&#xA;&#xA;  &#xA;  &#xA;&#xA;&#xA;&#xA;&#xA;  <div class="horizontal-gradient">&#xA;&#xA;  </div>&#xA;&#xA;&#xA;&#xA;

  


  


  



  I have also used the following libraries or frameworks

  


  


  puppeteer-screen-recorder(NodeJS)

  


  


  


  Canvas(JavaScript)

  


  


  


  remotion.dev(Reac and Nodejs)

  


  


  


  Obs

  


  


  But it still shows me poor video quality

  


  

  


  Any support is welcome

  


• C# discord bot no sound using ffmpeg

  23 mars 2018, par Tao Sun

  I’m trying to implement a music bot using C# for discord. The code is currently hanging at

  await output.CopyToAsync(discord);

  with no sound in voice channel. Here’s the code :

  public async Task SendAudioAsync(IGuild guild, IMessageChannel channel, string path)
  
          {
  
              var ffmpeg = CreateStream(path);
  
              var output = ffmpeg.StandardOutput.BaseStream;
  
  
  
  
  
              if (audioClient!=null)
  
              {
  
  
  
                  Console.WriteLine("get channel!" + audioClient.ToString());
  
  
  
                  var discord = audioClient.CreatePCMStream(AudioApplication.Voice);
  
                  Console.WriteLine("before copying");
  
                  await output.CopyToAsync(discord);
  
                  Console.WriteLine("finished copying");
  
                  await discord.FlushAsync();
  
                  Console.WriteLine("finished");
  
              }
  
          }
  
  
  
  
  
          private Process CreateStream(string path)
  
          {
  
              return Process.Start(new ProcessStartInfo
  
              {
  
                  FileName = "E:\\discord_projects\\yikkuro_s_slave\\bot\\yikkuro_s_slave_bot\\ffmpeg\\bin\\ffmpeg.exe",
  
                   Arguments = $"-i {path} -ac 2 -f s16le -ar 48000 pipe:1",
  
                  UseShellExecute = false,
  
                  RedirectStandardOutput = true
  
              });
  
          }

  I think its kinda doing the job with console output :
  enter image description here

  But there is no sound in discord.