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• Find video resolution and video duration of remote mediafile

  22 février 2012, par osgx

  I want to write an program which can find some metainformation of mediafile. I'm interested in popular video formats, such as avi, mkv, mp4, mov (may be other popular too). I want basically to get :

  • Video size (720, 1080, 360 etc)
  • Total runtime of video (may be not very exact)
  • Number of audio streams
  • Name of video codec
  • Name of audio codec

  There is already the mediainfo, but in my program I want to get information about remote file, which may be accessed via ftp, http, samba ; or even torrent (there are some torrent solutions, which allows to read not-yet downloaded file).

  MediaInfo library have no support of samba (smb ://) and mkv format (for runtime).

  Also, I want to know, how much data should be downloaded to get this information. I want not to download full videofile because I have no enough disk space.

  Is this information in the first 1 or 10 or 100 KiloBytes of the file ? Is it at predictable offset if I know the container name and total file size ?

  PS : Platform is Linux, Language is C/C++

• How to convert a Stream on the fly with FFMpegCore ?

  18 octobre 2023, par Adrian

  For a school project, I need to stream videos that I get from torrents while they are downloading on the server.
When the video is a .mp4 file, there's no problem, but I must also be able to stream .mkv files, and for that I need to convert them into .mp4 before sending them to the client, and I can't find a way to convert my Stream that I get from MonoTorrents with FFMpegCore into a Stream that I can send to my client.

  


  Here is the code I wrote to simply download and stream my torrent :

  


  var cEngine = new ClientEngine();

var manager = await cEngine.AddStreamingAsync(GenerateMagnet(torrent), ) ?? throw new Exception("An error occurred while creating the torrent manager");

await manager.StartAsync();
await manager.WaitForMetadataAsync();

var videoFile = manager.Files.OrderByDescending(f => f.Length).FirstOrDefault();
if (videoFile == null)
    return Results.NotFound();

var stream = await manager.StreamProvider!.CreateStreamAsync(videoFile, true);
return Results.File(stream, contentType: "video/mp4", fileDownloadName: manager.Name, enableRangeProcessing: true);


  


  I saw that the most common way to convert videos is by using ffmpeg. .NET has a package called FFMpefCore that is a wrapper for ffmpeg.

  


  To my previous code, I would add right before the return :

  


  if (!videoFile.Path.EndsWith(".mp4"))
{
    var outputStream = new MemoryStream();
    FFMpegArguments
        .FromPipeInput(new StreamPipeSource(stream), options =>
        {
            options.ForceFormat("mp4");
        })
        .OutputToPipe(new StreamPipeSink(outputStream))
        .ProcessAsynchronously();
    return Results.File(outputStream, contentType: "video/mp4", fileDownloadName: manager.Name, enableRangeProcessing: true);
}


  


  I unfortunately can't get a "live" Stream to send to my client.

  


• Evolution #4471 : singulier_ou_pluriel pour l’arabe

  1er juin 2020, par George Kandalaft

  Correction :

  <span class="CodeRay"><span class="comment">/**
   * Afficher un message "un truc"/("deux trucs" pour l'arabe)/"N trucs" 
   * Les items sont à indiquer comme pour la fonction _T() sous la forme :
   * "module:chaine" 
   *
   * @param int $nb : le nombre
   * @param string $chaine_un : l'item de langue si $nb vaut un (ou $nb > 10 pour l'arabe)
   * @param string $chaine_plusieurs : l'item de lanque si $nb > 1 ($nb est compris entre 3 et 10 pour l'arabe)
   * @param string $var : La variable à remplacer par $nb dans l'item de langue (facultatif, défaut "nb")
   * @param array $vars : Les autres variables nécessaires aux chaines de langues (facultatif)
   * @return string : la chaine de langue finale en utilisant la fonction _T()
   */</span>
  <span class="keyword">function</span> <span class="function">ar_singulier_ou_pluriel</span>(<span class="local-variable">$nb</span>, <span class="local-variable">$chaine_un</span>, <span class="local-variable">$chaine_plusieurs</span>, <span class="local-variable">$var</span> = <span class="string"><span class="delimiter">'</span><span class="content">nb</span><span class="delimiter">'</span></span>, <span class="local-variable">$vars</span> = <span class="predefined">array</span>()) {
      <span class="keyword">if</span> (!<span class="local-variable">$nb</span> = <span class="predefined">intval</span>(<span class="local-variable">$nb</span>)) {
          <span class="keyword">return</span> <span class="string"><span class="delimiter">'</span><span class="delimiter">'</span></span>;
      }
      <span class="keyword">if</span> (!<span class="predefined">is_array</span>(<span class="local-variable">$vars</span>)) {
          <span class="keyword">return</span> <span class="string"><span class="delimiter">'</span><span class="delimiter">'</span></span>;
      }
      <span class="local-variable">$vars</span>[<span class="local-variable">$var</span>] = <span class="local-variable">$nb</span>;
   
      <span class="keyword">if</span> (<span class="predefined">$GLOBALS</span>[<span class="string"><span class="delimiter">'</span><span class="content">spip_lang</span><span class="delimiter">'</span></span>] == <span class="string"><span class="delimiter">'</span><span class="content">ar</span><span class="delimiter">'</span></span>) {
          <span class="local-variable">$fem</span> = <span class="predefined">substr</span>(_T(<span class="local-variable">$chaine_un</span>), -<span class="integer">2</span>);
          <span class="keyword">switch</span> (<span class="predefined-constant">true</span>) {
              <span class="keyword">case</span> (<span class="local-variable">$nb</span> == <span class="integer">1</span>):
                  <span class="keyword">if</span> (<span class="local-variable">$fem</span> == <span class="string"><span class="delimiter">'</span><span class="content">ة</span><span class="delimiter">'</span></span>) {
                      <span class="local-variable">$un</span> = _T(<span class="local-variable">$chaine_un</span>) . <span class="string"><span class="delimiter">'</span><span class="content"> واحدة</span><span class="delimiter">'</span></span>;
                  } <span class="keyword">else</span> {
                      <span class="local-variable">$un</span> = _T(<span class="local-variable">$chaine_un</span>) . <span class="string"><span class="delimiter">'</span><span class="content"> واحد</span><span class="delimiter">'</span></span>;
                  }
                  <span class="keyword">return</span> <span class="local-variable">$un</span>;
                  <span class="keyword">break</span>;
              <span class="keyword">case</span> (<span class="local-variable">$nb</span> == <span class="integer">2</span>):
                  <span class="keyword">if</span> (<span class="local-variable">$fem</span> == <span class="string"><span class="delimiter">'</span><span class="content">ة</span><span class="delimiter">'</span></span>) {
                      <span class="local-variable">$deux</span> = <span class="predefined">rtrim</span>(_T(<span class="local-variable">$chaine_un</span>), <span class="local-variable">$fem</span>) . <span class="string"><span class="delimiter">'</span><span class="content">تان</span><span class="delimiter">'</span></span>;
                  } <span class="keyword">else</span> {
                      <span class="local-variable">$deux</span> = _T(<span class="local-variable">$chaine_un</span>) . <span class="string"><span class="delimiter">'</span><span class="content">ان</span><span class="delimiter">'</span></span>;
                  }
                  <span class="keyword">return</span> <span class="local-variable">$deux</span>;
                  <span class="keyword">break</span>;
              <span class="keyword">case</span> (<span class="local-variable">$nb</span> ><span class="integer">2</span> &#38;&#38; <span class="local-variable">$nb</span> &lt; <span class="integer">11</span>):
                  <span class="keyword">return</span> _T(<span class="local-variable">$chaine_plusieurs</span>, <span class="local-variable">$vars</span>);
                  <span class="keyword">break</span>;
              <span class="keyword">default</span>:
                  <span class="local-variable">$chaine_un</span> = <span class="local-variable">$nb</span> . <span class="string"><span class="delimiter">'</span><span class="content"> </span><span class="delimiter">'</span></span> . <span class="local-variable">$chaine_un</span>;
                  <span class="keyword">return</span> _T(<span class="local-variable">$chaine_un</span>, <span class="local-variable">$vars</span>);
          }
      } <span class="keyword">else</span> {
          <span class="keyword">if</span> (<span class="local-variable">$nb</span> > <span class="integer">1</span>) {
              <span class="keyword">return</span> _T(<span class="local-variable">$chaine_plusieurs</span>, <span class="local-variable">$vars</span>);
          } <span class="keyword">else</span> {
              <span class="keyword">return</span> _T(<span class="local-variable">$chaine_un</span>, <span class="local-variable">$vars</span>);
          }
      }
  }
  </span>
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