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• How can I generate a master HLS playlist with 1-4 video streams of different resolutions ?

  25 mars 2019, par toastedDeli

  I’m programmatically generating ffmpeg command line tool commands and running them with system() in c.

  All of the commands I run are to transcode a single input RTMP stream into 1-4 (depending on input size) output resolutions.

  my commands have the form :

  ffmpeg -i <input rtmp="rtmp" /> /
  
  <transcode options="options" 1="1"> -hls_list_size 6 <output> /
  
  <transcode options="options" 2="2"> -hls_list_size 6 <output> /
  
  <transcode options="options" 3="3"> -hls_list_size 6 <output> /
  
  <transcode options="options" 4="4"> -hls_list_size 6 <output> 
  
  </output></transcode></output></transcode></output></transcode></output></transcode>

  with different amounts of depending on the input resolution.

  I have tried adding -master_pl_name master.m3u8 -master_pl_publish_rate 30

  to the end to generate a master playlist but this doesn’t seem to work.

• Master playlist generate points to only one resolution among multiple

  25 avril 2019, par Parthib Dutta

  I am trying to convert one mp4 movie to multiple bitrate HLS . The individual resolutions are generating fine with their own playlists . But the master playlist includes only one resolution .

  ffmpeg -hide_banner -re -i video.mp4 -master_pl_name master.m3u8    ^
  
    -vf scale=w=640:h=-2 -c:a aac -ar 48000 -c:v h264 -profile:v main -crf 20 -sc_threshold 0 -g 48 -keyint_min 48 -hls_time 4   -b:v 800k -maxrate 856k -bufsize 1200k -b:a 96k -hls_segment_filename D:\xampp\htdocs\streaming-demo\360p_%%03d.ts  D:\xampp\htdocs\streaming-demo\360p_%v.m3u8 ^
  
    -vf scale=w=842:h=-2 -c:a aac -ar 48000 -c:v h264 -profile:v main -crf 20 -sc_threshold 0 -g 48 -keyint_min 48 -hls_time 4  -b:v 1400k -maxrate 1498k -bufsize 2100k -b:a 128k -hls_segment_filename D:\xampp\htdocs\streaming-demo\480p_%%03d.ts  D:\xampp\htdocs\streaming-demo\480p_%v.m3u8 ^
  
    -vf scale=w=1280:h=-2 -c:a aac -ar 48000 -c:v h264 -profile:v main -crf 20 -sc_threshold 0 -g 48 -keyint_min 48 -hls_time 4  -b:v 2800k -maxrate 2996k -bufsize 4200k -b:a 128k -hls_segment_filename D:\xampp\htdocs\streaming-demo\720p_%%03d.ts  D:\xampp\htdocs\streaming-demo\720p_%v.m3u8 ^
  
    -vf scale=w=1920:h=-2 -c:a aac -ar 48000 -c:v h264 -profile:v main -crf 20 -sc_threshold 0 -g 48 -keyint_min 48 -hls_time 4  -b:v 5000k -maxrate 5350k -bufsize 7500k -b:a 192k -hls_segment_filename D:\xampp\htdocs\streaming-demo\1080p_%%03d.ts  D:\xampp\htdocs\streaming-demo\1080p_%v.m3u8

  It include only the 360p resolution playlist link .

• Creating live hls playlist with FFmpeg using chunk size mp4 files

  4 mai 2019, par rustin peter

  I have a program coded in python that will downloads and output h264 video and audio files every 6 seconds.
  Each h264 video audio is a 10 second segment.
  so basically, every 6 seconds new video.h264 and auio.h264 file replaces with video.h264 and auio.h264 file

  My goal here is to create a hls playlist with these downloaded h264 files

  I am using ffmpeg to transcode these h264 files and convert them into hls playlist but there is a problem here.
  The playlist stops once after the first h264 video finishes. m3u8 is not fetching the next .ts which is created by ffmpeg. How do i make the hls playlist keeps on playing the .ts files and works like a live streaming ?

  ffmpeg -i video.h264 -i audio.h264  -loglevel info  -c:v libx264  -c:a aac -ac 1 -strict -2   -r 25 -crf 23  -profile:v baseline  -preset:v  ultrafast   -maxrate 2048k   -bufsize 2048k    -pix_fmt  yuv420p  -s 720x576   -flags -global_header -hls_time 10 -hls_list_size 6 -hls_wrap 10 -start_number 1  test.m3u8