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• arm : vp9itxfm : Avoid .irp when it doesn’t save any lines

  4 février 2017, par Martin Storsjö

  arm : vp9itxfm : Avoid .irp when it doesn’t save any lines
  This makes it more readable.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavcodec/arm/vp9itxfm_neon.S

• FFmpeg - What muxer do i need to save an AAC audio stream

  1er mars 2017, par David Barishev

  I’m developing Android application, and im using ffmpeg for conversion of files.
  I want my binary file to be as slim as possible since i don’t have many input formats and output formats, and my operation is quite basic.And of course not to bloat the APK.

  In my program ffmpeg receives a file, and copys the audio stream (-acodec copy), the audio stream will always be aac (mp4a). What i need is to save the stream to file.
  My command looks like this : ffmpeg -i {Input} -vn -acodec copy output.aac.

  What muxer do i need to for muxing aac to file ? I have tried flv,mp3,mov but i always get
  Unable to find a suitable output format for 'output.aac', so these options are wrong.
  I don’t need an encoder for stream copy btw.

  Side note : this command work flawlessly on full installation of ffmpeg , but I don’t know which muxer it uses. If there is a way to output the muxer it uses from regular ffmpeg run, it would work too.

• C# Streaming from IP Camera and save to file in UWP Windows 10

  2 mars 2017, par cahernanz

  I am developing an universal windows 10 App that must record from an ACTi ip camera, and recording to file. For the preview i used VLC.MediaElement and it works perfectly, but i need to record or save this continuous frames to video file. Anyone knows how saving it to file. Cameras streams using http protocol, not RTSP or anything else.

  it doesnt mind if I use VLC of FFMPEG, but I can´t launch it from cmd.exe in UWP apps.

  any ideas ?.

  I used VLC.MediaElement this way. For the Preview there is no problem :

   
  
              
  
                  
  
              
  
          
  
          <mediaelement aretransportcontrolsenabled="True" autoplay="True" horizontalalignment="Left" height="204" margin="38,44,0,0" verticalalignment="Top" width="212"></mediaelement>

  But I think I can´t recod using it becausa probably is under developing.

  My idea is creating something like that, but it doesnt work streaming continuously, just the first frame.

    public async void StartRecording()
  
      {
  
          Windows.Storage.StorageFolder storageFolder = Windows.Storage.ApplicationData.Current.LocalFolder;
  
  
  
          Debug.WriteLine(storageFolder.Path);   
  
  
  
          Windows.Storage.StorageFile sampleFileVid =
  
  await storageFolder.CreateFileAsync(DateTime.Now.ToString("yyyyMMdd") + "File.avi",
  
  Windows.Storage.CreationCollisionOption.OpenIfExists)
  
  
  
  
  
  
  
  VLCPreview.Source = "http://Admin:123456@192.168.0.21:6021/cgi-bin/cmd/encoder?GET_STREAM";
  
  
  
  
  
  
  
  
  
          try
  
          {
  
                              HttpClientHandler aHandler = new HttpClientHandler();
  
                              aHandler.Credentials = new NetworkCredential("Admin", "123456");
  
                              aHandler.ClientCertificateOptions = ClientCertificateOption.Automatic;
  
  
  
                              HttpClient aClient = new HttpClient(aHandler);
  
                              aClient.DefaultRequestHeaders.ExpectContinue = false;
  
  
  
                              HttpResponseMessage response = await aClient.GetAsync("http://192.168.0.21:6021/cgi-bin/cmd/encoder?GET_STREAM", HttpCompletionOption.ResponseHeadersRead);//urlLinkToOnlineStream
  
  
  
  
  
                              var destinationFile = sampleFileVid;
  
                              var fileStream = await destinationFile.OpenAsync(FileAccessMode.ReadWrite);
  
  
  
                              Stream stream = await response.Content.ReadAsStreamAsync();
  
                               IInputStream inputStream = stream.AsInputStream();
  
                               ulong totalBytesRead = 0;
  
                               while (true)
  
                               {
  
                                   // Read from the web.
  
                                   IBuffer buffer = new Windows.Storage.Streams.Buffer(1024);
  
                                   buffer = await inputStream.ReadAsync(buffer, buffer.Capacity, InputStreamOptions.None);
  
                                   if (buffer.Length == 0)
  
                                   {
  
                                       break;
  
                                   }
  
                                   totalBytesRead += buffer.Length;
  
                                   await fileStream.WriteAsync(buffer);
  
                                  Debug.WriteLine("TotalBytesRead: {0:f}", totalBytesRead);
  
                              }
  
  
  
                              inputStream.Dispose();
  
  
  
                              fileStream.Dispose();  
  
  
  
          }
  
          catch (Exception ex)
  
          {
  
              Debug.WriteLine("Excepción de vídeo en StartRecording: ", ex);
  
          }
  
      }

  I am trying to follow 3 strategies :

  1. Record using appropiate c# code.

  2. Launche vlc.exe or ffmpeg.exe (desktop apps) from my uwp app.

  3. Using VLC.MediaElement to record.

  I’d rather first or second option in order to manage correctly the resources of the computer, but there is no problem if it works, just custom the buffers.

  Thanks in advance, remember it is an ip camera, not webcams, I can´t use captureElement.