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• FFMPEG Streaming, using list for multiple presentations

  3 janvier 2021, par JJ The Second

  I am currently using a third party library to transcode videos from mp4 to HLS. https://video.aminyazdanpanah.com/python/start?r=hls#hls Great documentation and works fine however I have an issue by passing a list to hls.representations() that I think is something wrong I do. Here is how I run my code.

  


  presetList = []
rep_1  = Representation(Size(1920,1080), Bitrate(4096 * 1024, 320 * 1024))
                    presetList.append(rep_1)
rep_2 = Representation(Size(1440, 900), Bitrate(2048 * 1024, 320 * 1024))
                    presetList.append(rep_2)

video =  "file.mp4"
video = ffmpeg_streaming.input(video)
completed_destination = "completed.m3u8"
hls = video.hls(Formats.h264())
hls.representations(presetList)
hls.output(completed_destination)


  


  When I run this I get following error, that is triggered by library meaning values in my list not passed properly ?

  


    File "/var/www/transcoder/transcoder/env/lib/python3.8/site-packages/ffmpeg_streaming/_hls_helper.py", line 87, in stream_info
    f'BANDWIDTH={rep.bitrate.calc_overall}',
AttributeError: 'list' object has no attribute 'bitrate'


  


  if I instead run the same code with only change as below, works like a charm :

  


  hls.representations(rep_1, rep_2)


  


  What am I doing wrong here ? Thanks

  


• C# Bitmap to AVI / WMV with Compression

  5 juillet 2019, par Digitalsa1nt

  Prelude :

  I’m going to preface this with, I have been learning C# in my spare time at work, and that I have been staring at code for a solid two days trying to wrap my head around this problem. I am developing some software to be used with a visualiser that connects by USB to a standard Desktop PC, the software detects the capture device and loads frames into bitmap using a New Frame Event, this is then displayed in a ’picture box’ as a live video stream. The problem as it sits is trying to encorporate the ability to record the stream and save to file, preferably a WMV or a compressed AVI.

  What’s been tried :

  I have considered and looked into the following :

  SharpAVI - cant seem to get this to compress or save the frames properly as it appears to mainly look at existing AVI files.

  AForge.Video.VFW - AVI files can be created but are far too large to be used, due to restrictions on the user areas of the individuals who will be using this software.

  AForge.Video.FFMPEG - Again due to considerations of those using this software I can’t have unmanaged DLL’s sat in the output folder with the Executable file, and unfortunately this particular DLL cant be compiled properly using Costura Fody.

  AVIFile Library Wrapper (From Code Project) - Again can’t seem to get this to compress a stream correctly from Bitmaps from the New Frame Events.

  DirectShow - Appears to use C++ and unfortunately is beyond my skill level at this time.

  The Relevant Code Snippets :

  Current References :

  using System.Data;
  
  using System.Drawing;
  
  using System.Linq;
  
  using System.Text;
  
  using System.Threading.Tasks;
  
  using System.Windows.Forms;
  
  using System.Resources;
  
  using System.Drawing.Imaging;
  
  using System.IO;
  
  //Aforge Video DLL's
  
  using AForge.Video;
  
  using AForge.Video.VFW;
  
  using AForge.Video.DirectShow;
  
  //Aforge Image DLL's
  
  using AForge.Imaging;
  
  using AForge.Imaging.Formats;
  
  using AForge.Imaging.Filters;
  
  //AviLibrary
  
  using AviFile;

  Global Variables :

      #region Global Variables
  
  
  
      private FilterInfoCollection CaptureDevice; // list of available devices
  
      private VideoCaptureDevice videoSource;
  
      public System.Drawing.Image CapturedImage;
  
  
  
      bool toggleMic = false;
  
  
  
      bool toggleRec = false;
  
      //aforge
  
      AVIWriter aviWriter;
  
      Bitmap image;
  
  
  
  
  
      #endregion

  Code for Displaying Stream

      #region Displays the Stream
  
  
  
      void videoSource_NewFrame(object sender, NewFrameEventArgs eventArgs)
  
      {
  
          picBoxStream.SizeMode = PictureBoxSizeMode.Zoom;
  
          picBoxStream.Image = (Bitmap)eventArgs.Frame.Clone();// clones the bitmap
  
  
  
  
  
          if (toggleRec == true)
  
          {
  
              image = (Bitmap)eventArgs.Frame.Clone();
  
              aviWriter.AddFrame(image);
  
          }
  
      }
  
  
  
      #endregion

  Current Code for Recording Stream

      #region Record Button
  
  
  
      private void btnRecord_Click(object sender, EventArgs e)
  
      {
  
          if (toggleRec == false)
  
          {
  
              saveAVI = new SaveFileDialog();
  
              saveAVI.Filter = "AVI Files (*.avi)|*.avi";
  
  
  
              if (saveAVI.ShowDialog() == DialogResult.OK)
  
              {
  
                  aviWriter = new AVIWriter();
  
                  aviWriter.Open(saveAVI.FileName, 1280, 720);
  
  
  
                  toggleRec = true;
  
                  Label lblRec = new Label();
  
              }
  
  
  
          }
  
          else if (toggleRec == true)
  
          {
  
              aviWriter.Close();
  
              toggleRec = false;
  
          }
  
      }
  
  
  
      #endregion

  I apoligise if the above code doesn’t look quite right, I have been swapping, changing and recoding those three sections a lot in order to find a working combination. This means that it’s rather untidy but I didn’t see the point in cleaning it all up until I had the code working. That being said really any help that you can provide is greatfully recieved, even if it’s a case of what I want to do just cannot be done.

  Thank you in advance.

  EDIT : 2019 :

  It’s been awhile since I posted this and it still gets the odd bit of interest here and there. Back when I posted this I was teaching myself to code and I had this weird quirk that I didn’t like using 3rd party libraries if I could avoid it, I wanted to do my own work, since then I’ve learnt a lot and one of those things is that the open source world is immense, impressive and kind. So if there is a 3rd party library that does what you want just use it, it’ll save you time.

• Revision 3274 : pas nécessite mais utilise

  18 avril 2010, par kent1 — Log

  pas nécessite mais utilise