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• 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 !

• lavf/matroskaenc.c : add early support for colour elements

  7 mars 2016, par Neil Birkbeck

  lavf/matroskaenc.c : add early support for colour elements
  Adding early support for a subset of the proposed colour elements
  
  according to the latest version of spec :
  
  https://mailarchive.ietf.org/arch/search/?email_list=cellar&gbt=1&index=hIKLhMdgTMTEwUTeA4ct38h0tmE
  Like matroskadec, I’ve left out elements for pix_fmt related things
  
   as there still seems to be some discussion around these.
  The new elements are exposed under strict experimental mode.
  Signed-off-by : Neil Birkbeck <neil.birkbeck@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/matroskaenc.c