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• fastest way to convert .MKV files to HTTP Live Streaming (HLS)

  22 septembre 2017, par Oli

  Can anyone advise on how to convert .mkv files to HLS format ? we have lots of .mkv files and we are going to lunch our live streaming website so we decided to programatically convert our files to HLS format. we tried ffmpeg and vodobox HLS encoder for conversion but both are too slow (about 1.5 h for each movie).

  platform information :

  • OS : Windows 10
  • CPU : Intel Core i5
  • Memory : 16 GB DDR4

• how to change the resolution FFMPEG live streaming to youtube

  15 juillet 2021, par StudyFromHome

  i use this code to live stream using my VPS in ffmpeg

  


  
#! /bin/bash
#


VBR="2500k"                                   
FPS="60"                                       
QUAL="ultrafast"                                  
YOUTUBE_URL="rtmp://a.rtmp.youtube.com/live2"  

SOURCE="/home/rsa-key/2222.mp4"             
KEY="ddf-khyf-dres-ek42-8sss"                                     

ffmpeg \
    -stream_loop -1 -i "$SOURCE" -deinterlace \
    -vcodec libx264 -pix_fmt yuv420p -preset $QUAL -r $FPS -g $(($FPS * 2)) -b:v $VBR \
    -acodec libmp3lame -ar 44100 -threads 6 -qscale 3 -b:a 712000 -bufsize 512k \
    -f flv "$YOUTUBE_URL/$KEY"  



  


  how i change the resolution limit like 480p

  


• How to mux live h264 stream in AnnexB nal unit format to flv container

  19 mai 2016, par Zhou Yufeng

  I have an Android device, which will send raw live H264 AnnexB NAL unit stream like [0,0,0,1,103,...][0,0,0,104,...][0,0,0,101,...][0,0,0,1,65,...][0,0,0,1,65,...] and try to mux them into flv container and send it to nginx-with rtmp module use libavformat of ffmpeg.

  If I save the received live stream to a local file, say test.h264. I can mux it to server OK using ffmpeg command "ffmpeg -i test.h264 -f flv rtmp ://my/server/url". But I don’t known how to handle live stream.

  I noticed ffmpeg/libavformat/avc.c have 2 functions that seem achieve my goal.
  But I’m not sure.

  Here is the code of ffmpeg

  int ff_avc_parse_nal_units(AVIOContext *pb, const uint8_t *buf_in, int size)
  
  {
  
      const uint8_t *p = buf_in;
  
      const uint8_t *end = p + size;
  
      const uint8_t *nal_start, *nal_end;
  
  
  
      size = 0;
  
      nal_start = ff_avc_find_startcode(p, end);
  
      for (;;) {
  
          while (nal_start < end && !*(nal_start++));
  
          if (nal_start == end)
  
              break;
  
  
  
          nal_end = ff_avc_find_startcode(nal_start, end);
  
          avio_wb32(pb, nal_end - nal_start);
  
          avio_write(pb, nal_start, nal_end - nal_start);
  
          size += 4 + nal_end - nal_start;
  
          nal_start = nal_end;
  
      }
  
      return size;
  
  }
  
  
  
  int ff_avc_parse_nal_units_buf(const uint8_t *buf_in, uint8_t **buf, int *size)
  
  {
  
      AVIOContext *pb;
  
      int ret = avio_open_dyn_buf(&pb);
  
      if(ret < 0)
  
          return ret;
  
  
  
      ff_avc_parse_nal_units(pb, buf_in, *size);
  
  
  
      av_freep(buf);
  
      *size = avio_close_dyn_buf(pb, buf);
  
      return 0;
  
  }

  Any useful reply are appreciated.

  Thank you !