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• Using Pipes for Stream Data in FFMPEG

  17 juillet 2024, par Aryan Kumar

  I am trying to input stream and decrease the bitrate of the video without saving it anywhere so i am hoping to pass it as a stream and get the output as a stream and send it to digital ocean spaces to get saved.
But I tried lots of things but my output Stream is getting empty. and the file is empty.

  


      public async Task VideoOperationAsync(Stream inputStream)
    {
        try
        {
            // Ensure the input stream is at the beginning
            inputStream.Position = 0;

            // Create a memory stream to hold the output data
            using (var outputStream = new MemoryStream())
            {
                var arguments = $"-i pipe:0 -f mp4 pipe:1";

                await Cli.Wrap("ffmpeg")
                    .WithArguments(arguments)
                    .WithStandardInputPipe(PipeSource.FromStream(inputStream))
                    .WithStandardOutputPipe(PipeTarget.ToStream(outputStream))
                    .WithValidation(CommandResultValidation.None)
                    .ExecuteAsync();

                // Ensure the output stream is at the beginning before reading
                outputStream.Position = 0;

                using (var fileStream = new FileStream(@"D:\Gremlin-data\VideoResized\output_cropped.mp4", FileMode.Create, FileAccess.Write))
                {
                    await outputStream.CopyToAsync(fileStream);
                }
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"An error occurred: {ex.Message}");
            throw;  // Re-throw the exception if needed
        }
    }


  


  I also earlier tried this :

  


  public async Task VideoOperationAsync(Stream inputStream)

try

// Ensure the input stream is at the beginning
inputStream.Position = 0 ;

  


          var ffmpegProcess = new Process
        {
            StartInfo = new ProcessStartInfo
            {
                FileName = "ffmpeg",  // Ensure ffmpeg is in your PATH or provide the full path
                Arguments = $"-i pipe:0 -b:v 2000k -f mp4 pipe:1",  // Correct bitrate format
                RedirectStandardInput = true,
                RedirectStandardOutput = true,
                RedirectStandardError = true,  // Capture standard error
                UseShellExecute = false,
                CreateNoWindow = true
            }
        };

        ffmpegProcess.Start();

        // Write input stream to ffmpeg's standard input asynchronously
        Task writingTask = Task.Run(async () =>
        {
            await inputStream.CopyToAsync(ffmpegProcess.StandardInput.BaseStream);
            ffmpegProcess.StandardInput.BaseStream.Close();
        });

        // Read ffmpeg's standard output to a memory stream asynchronously
        using (MemoryStream ms = new MemoryStream())
        {
            Task readingTask = Task.Run(async () =>
            {
                await ffmpegProcess.StandardOutput.BaseStream.CopyToAsync(ms);
            });


  


• Revision 64e2597465 : Disable update of last_show_frame for existing frame When showing a previously

  23 janvier 2014, par Adrian Grange

  Changed Paths :
   Modify /test/test-data.sha1

  
   Modify /test/test.mk

  
   Modify /test/test_vectors.cc

  
   Modify /test/test_vectors.h

  
   Modify /vp9/decoder/vp9_onyxd_if.c

  
   Modify /vp9/encoder/vp9_onyx_if.c

  
  
  Disable update of last_show_frame for existing frame

  When showing a previously decoded frame, i.e. when
  show_existing_frame=1, the update of the
  last_show_frame flag must be disabled.

  This is to ensure that the last_show_frame flag
  reflects the state of the flag for the immediately
  previously decoded frame rather then the value that
  was forced to ensure that a previously decoded frame
  would be displayed.

  This patch also adds a test vector to verify that the
  display_existing_frame flag works as expected. Code
  for generating the test vector can be found in this
  patch :
  https://gerrit.chromium.org/gerrit/#/c/68581/

  (Bug originally reported by Alexander Voronov
  <ru.xalba@gmail.com>).

  Change-Id : I731d288fba02088959f7fcc87707137fffc6acf5

• Anomalie #4623 : Styles des fieldset dans l’espace privé

  17 avril 2021, par nicod _

  En vraie CSS sans trucage :

  .fieldset .fieldset fieldset 
      margin-left : var(—spip-form-gutter-x) ;
      border-left : 3px solid var(—spip-form-border-color) ;
      border-radius : 12px ;
      margin-bottom : var(—spip-form-gutter-y) ;
  
  .fieldset .fieldset fieldset .editer-groupe:last-child 
      padding-bottom : 0 ;