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• Is it possible to read streaming response body using fiber ?

  2 novembre 2023, par MHM

  I have a streaming server(ffmpeg) that send data through HTTP.
I sent the stream to my fiber backend but I only have access to c.body() when the stream server(ffmpeg) is terminated.
Is there any way to capture streamed data in real-time in fiber ?

  


  here is my sample code :

  


  package main

import "github.com/gofiber/fiber/v2"

func main() {
  app := fiber.New()
  
app.Post("/", func(c *fiber.Ctx) error {
    golang        // real-time reading streamed data in c.body() and send it to fiber websocket
        return c.SendStatus(200)

}


  


• Get the actual duration of a sound file in C++ (libavformat)

  1er avril 2017, par user3734670

  I want to get the duration of a sound file in my C++ application. I want to support a lot of sound codecs, so I decided to use libavformat.

  I get the duration, but I get also a notification that the duration can be inaccurate. In another Stackoverflow question (How to get the real, actual duration of an MP3 file (VBR or CBR) server-side) it was mentioned that you can decode the file completely to get the actual duration. How can I this archive with libavformat ?

  My code to get the inaccurate duration :

  av_register_all();
  
  AVFormatContext* pFormatCtx = avformat_alloc_context();
  
  avformat_open_input(&pFormatCtx, audio_file, NULL, NULL);
  
  avformat_find_stream_info(pFormatCtx, 0);
  
  av_dump_format(pFormatCtx, 0, audio_file, 0);
  
  int64_t duration = pFormatCtx->duration;
  
  std::cout << ceil((double) duration / AV_TIME_BASE) << std::endl;
  
  avformat_close_input(&pFormatCtx);
  
  avformat_free_context(pFormatCtx);

• FFmpeg How to write video to a file

  9 décembre 2014, par NoviceAndNovice

  What i want is

   1. Get video packet from stream source
  
   2. Decode it
  
   3. And write  that decoded data as video file(avi, mpeg etc)

  I can able to get video Packets from a file (as AVPacket) and also can decode and save as an image.(raw)( FFmpeg tutorials show how to do it).
  But i can not ( do not know ) write that video data to a file(other) which can be played by media players(such as VLC).

  Best Wishes

  Ps : Real code samples will be great if possible...

  Now i make test with av_interleaved_write but i got strange error "non monotone timestamps" ( i have no control over pts values of media source )

  Some Extra Info

  In FFmpeg I have to

  1. Read media packets from media source ( it may be real file(.avi,mov) or even rtsp server).
  2. Then write those media packets to a real file (physical .avi, .mov etc file)

  I need reader and writer. I can read the media source file ( even encode packets according to given format). But i can not write to file...(which any player can play)

  And some pseudoCode

  File myFile("MyTestFile.avi");
  
  
  
  while ( source ->hasVideoPackets)
  
  {
  
       packet = source->GetNextVideoPacket();
  
       Frame decodedFrame = Decode(packet);
  
       VideoPacket encodedPacket = Encode( decodedFrame);
  
       myFile.WriteFile(encodedPacket);
  
   }

  Or Just write the original file without encode decode

       File myFile("MyTestFile.avi");
  
  
  
       while ( source ->hasVideoPackets)
  
       {
  
           packet = source->GetNextVideoPacket();
  
           myFile.WriteFile(packet);
  
       }

  Then

  I can able to open MyTest.avi file with a player.