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• node js (or other) as streaming server

  20 décembre 2013, par Abdul Ali

  Apologies if a simple question but cannot find anything helpful . Am also new to the streaming concept.

  Goal is to set up a server which keeps on listening for data on a speific port. The user will be sending sequence of images from their iphone (# of images unknown).

  when the data is receieved, ffmpeg should start to get data from that port (as input) and send those images to ffserver to be streamed as a live video.

  did try Nginx-Rtmp module but the iphone developer have informed that in iphone, only ip and port can be given to open a stream (and no other part of the url can be given e.g. streamname and application name in case of nginx-rtmp)

  Any help and guide will be appreciatd that what can be used to set up a free and very simple sever that simply receives the images which ffmpeg can capture and send to ffserver .

• Extract specific frames of youtube video without downloading video

  22 janvier 2023, par Kashish Arora

  I need to extract specific frames of an online video to work on an algorithm but I don't want to download the whole video because that would make it highly inefficient.

  


  For starters, I tried working with youtube videos. I can download whole of the video using youtube-dl in this way :

  


  ydl_opts = {'outtmpl': r'OUTPUT_DIRECTORY_HERE',}
with youtube_dl.YoutubeDL(ydl_opts) as ydl:
    ydl.download([url])


  


  And then I can capture individual frames.

  


  I need to avoid downloading the whole video. After some research, I have found that ffmpeg might help me do this. I found no way to download just the frames so if this is not possible, the second option is that I can download specific portions of the video. One such example in linux is here but I couldn't find any solution for python.

  


  What is a good way to download just the frames, or portions of videos (in python) without downloading the entire thing ?

  


• NReco.VideoConverter.ConvertLiveMedia

  12 décembre 2022, par Psychosocial

  I get an exception when trying to write a raw image to ConvertLiveMedia :
  

  


  


  System.IO.IOException : "Канал был закрыт.

  


  System.IO.IOException : "The channel has been closed."

  


  


  var ffMpeg = new NReco.VideoConverter.FFMpegConverter();
var frame = Bitmap.FromFile("source.jpg");
var bytes = ImageToByte(frame);

using (var fs = new FileStream("output.mp4", FileMode.Create))
{
    var mediaTask = ffMpeg.ConvertLiveMedia(Format.raw_video, fs, Format.mp4, new ConvertSettings()
    {                    
    });
    
    mediaTask.Start();

    for (int f = 0; f < frames; f++)
    {
        mediaTask.Write(bytes, 0, bytes.Length);  //exception here channel was closed
    }
    mediaTask.Stop();
}