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• Video Streaming shows not working in Micorsoft Edge

  22 novembre 2018, par Ragesh S

  I am newbi in using Video streaming in ASP.Net MVC project. I have a video library webpplication, most of the videos are .mp4 format. Please see my code below.

  Code

  public HttpResponseMessage Get(string filename)
  
      {
  
          var filePath = new FileStreameHelpers().GetFilePath(filename);
  
          if (!File.Exists(filePath))
  
              return new HttpResponseMessage(HttpStatusCode.NotFound);
  
  
  
          var response = Request.CreateResponse();
  
          response.Headers.AcceptRanges.Add("bytes");
  
  
  
          var streamer = new FileStreameHelpers();
  
          streamer.FileInfo = new FileInfo(filePath);
  
          response.Content = new PushStreamContent(streamer.WriteToStream, new FileStreameHelpers().GetMimeType(Path.GetExtension(filePath)));
  
  
  
          RangeHeaderValue rangeHeader = Request.Headers.Range;
  
          if (rangeHeader != null)
  
          {
  
              long totalLength = streamer.FileInfo.Length;
  
              var range = rangeHeader.Ranges.First();
  
              streamer.Start = range.From ?? 0;
  
              streamer.End = range.To ?? totalLength - 1;
  
  
  
              response.Content.Headers.ContentLength = streamer.End - streamer.Start + 1;
  
              response.Content.Headers.ContentRange = new ContentRangeHeaderValue(streamer.Start, streamer.End,
  
                  totalLength);
  
              response.StatusCode = HttpStatusCode.PartialContent;
  
          }
  
          else
  
          {
  
              response.StatusCode = HttpStatusCode.OK;
  
          }
  
  
  
          return response;
  
      }
  
    public async Task WriteToStream(Stream outputStream, HttpContent content, TransportContext context)
  
      {
  
          try
  
          {
  
              var buffer = new byte[6553600];
  
              using (var video = FileInfo.OpenRead())
  
              {
  
                  if (End == -1)
  
                  {
  
                      End = video.Length;
  
                  }
  
                  var position = Start;
  
                  var bytesLeft = End - Start + 1;
  
                  video.Position = Start;
  
                  while (position <= End)
  
                  {
  
                      var bytesRead = video.Read(buffer, 0, (int)Math.Min(bytesLeft, buffer.Length));
  
                      await outputStream.WriteAsync(buffer, 0, bytesRead);
  
                      position += bytesRead;
  
                      bytesLeft = End - position + 1;
  
                  }
  
              }
  
          }
  
          catch (Exception ex)
  
          {
  
              // fail silently
  
              Utilities.SaveException("FileStreameHelpers - WriteToStream", ex);
  
          }
  
          finally
  
          {
  
              outputStream.Close();
  
          }
  
      }

  it works fine in Firefox and Chrome but it shows error in Microsoft Edge browser like below.

  HTML

  <video width="320" height="240" controls="controls">
  
      <source src="/api/Media/Get?filename=SampleVideo_1280x720_1mb.mp4" type="video/mp4">
  
      Your browser does not support the video tag.
  
  </source></video>

  The remote host closed the connection. The error code is 0x800703E3.

  Please advice.

• avfilter/vf_corr : for all zero returns zero score instead of 1

  3 décembre 2023, par Paul B Mahol

  avfilter/vf_corr : for all zero returns zero score instead of 1
  

  • [DH] libavfilter/vf_corr.c

• libavcodec avcodec_open2 returns -22

  28 juillet 2012, par buchtak

  I am trying to learn how to encode video using libavcodec library. I use the following initialization :

  avcodec_register_all();
  
  
  
  // This works fine.
  
  AVCodec *avcodec = avcodec_find_encoder( CODEC_ID_H264 );
  
  
  
  AVCodecContext *avctx = avcodec_alloc_context3( avcodec );
  
  avctx->bit_rate      = 400000;
  
  avctx->width         = 640;
  
  avctx->height        = 480;
  
  avctx->time_base.den = 15;
  
  avctx->time_base.num = 1;
  
  avctx->gop_size      = 10;
  
  avctx->max_b_frames  = 1;
  
  avctx->pix_fmt       = PIX_FMT_YUV420P;
  
  av_opt_set( avctx->priv_data, "preset", "slow", 0 );
  
  
  
  // ret should be zero, but it's negative
  
  int ret = avcodec_open2( avctx, avcodec, NULL );

  However, avcodec_open2(...) always returns a negative value. The avcodec_find_encoder(...) works fine and the returned pointer is not NULL. I use Win7 x64, 64-bit Zeranoe FFmpeg build from

  http://ffmpeg.zeranoe.com/builds/

  According to the readme the FFmpeg version is 2012-06-22 git-c17808c built with --enable-libx264. I also tried CODEC_ID_MPEG1VIDEO and changing some of the initialization parameters, but no matter what I do, the avcodec_open2(...) always returns value -22. The decoding/encoding example provided with the Zeranoe build (it's the same one as http://ffmpeg.org/doxygen/trunk/api-example_8c-source.html) does not work either...