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• How can I generate a multiple period DASH manifest with ffmpeg ?

  14 août 2023, par Robert Simmons Jr.

  I am looking to encode a file and generate multiple periods rather than just one period. When I try to run ffmpeg with the below command, the result is a single period with multiple adaptation sets so clearly that is the wrong approach. I had thought by breaking the files by time this might work but apparently not. Any advice would be appreciated :

  


    ffmpeg -i ~/Downloads/turkish-horses.mp4 \
  -map 0:v:0 -b:v:1 1000k -ss 0 -t 5 -c:v:1 libx264 -filter:v:1 "scale=640:-1"  \
  -map 0:v:0 -b:v:2 1000k -ss 5 -c:v:2 libx264 -filter:v:2 "scale=640:-1"  \
  -map 0:v:0 -b:v:3 3000k -ss 0 -t 5 -c:v:3 libx264 -filter:v:3 "scale=1280:-1" \
  -map 0:v:0 -b:v:4 3000k -ss 5 -c:v:4 libx264 -filter:v:4 "scale=1280:-1" \
  -map 0:a\?:0 -ss 0 -t 5 -c:a aac -b:a 192k \
  -map 0:a\?:0 -ss 5 -c:a aac -b:a 192k \
  -use_timeline 1 -use_template 0 \
  -adaptation_sets "id=0,streams=0,2  id=1,streams=4 id=2,streams=1,3 id=3,streams=5" \
  -f dash output.mpd


  


• provide time period in ffmpeg drawtext filter

  25 janvier 2014, par ZafarYousafi

  I am trying to add text to video using ffmpeg and wants text to appear for a given period of time. I am trying to use DrawText filter but don't know how to provide time period for this filter. Can Anybody please help me.

  Thanks

• using ffmpeg in asp.net razor (C#)

  18 avril 2014, par user3549636

  I know questions like this are all over the internet but I believe my case is different, I have a ASP.NET Webpage (Razor C#) and I have a whole video sharing website ready BUT I still don't understand, How can I convert videos to mp4 and webm using ffmpeg on the upload page and instead of having the original saved and added to the database i want the converted version added. heres my upload page code :

      @{
  
  WebSecurity.RequireAuthenticatedUser();
  
  var db = Database.Open("PhotoGallery");
  
  var fileName = "";
  
  var uploader = WebSecurity.CurrentUserId;
  
  var date = DateTime.Now.Date;
  
  var extention = "";
  
  if(IsPost){
  
   var numFiles = Request.Files.Count;
  
   if(numFiles <= 0){
  
       ModelState.AddError("fileUpload", "Please specify at least one photo to upload.");
  
   }
  
   else{
  
       var fileSavePath = "";
  
          var uploadedFile = Request.Files[0];
  
      fileName = Path.GetFileNameWithoutExtension(uploadedFile.FileName).Trim();
  
      extention = Path.GetExtension(uploadedFile.FileName).Trim();
  
      string ndom = Path.GetRandomFileName();
  
      var none = ndom.Remove(ndom.Length - 4);
  
      fileSavePath = Server.MapPath("~/Images/userpics/" +
  
        none + extention);
  
      uploadedFile.SaveAs(fileSavePath);
  
      var insertCommand = "INSERT INTO Videos (FileTitle, UploadDate, UserId, ext, Name) Values(@0, @1, @2, @3, @4)";
  
       db.Execute(insertCommand, fileName, date, uploader, extention, none + extention);
  
       Response.Redirect(Href("~/Photo/View", db.GetLastInsertId()));
  
       }
  
      }
  
      }
  
  <h1>Upload Video</h1>
  
  
  
  <form method="post" enctype="multipart/form-data">
  
  @Html.ValidationSummary("Unable to upload:")
  
  <fieldset class="no-legend">
  
      <legend>Upload Photo</legend>
  
      @FileUpload.GetHtml(addText: "Add more files", uploadText: "Upload", includeFormTag: false)
  
      <p class="form-actions">
  
          <input type="submit" value="Upload" title="Upload photo" />
  
      </p>
  
  </fieldset>
  
  </form>
  
  
  
  <p class="message info">
  
  The maximum file size is 50MB.
  
  </p>