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• AV1 libaom encoder option aq-mode description

  6 juin 2023, par Chinmaey Shende

  I could not find the official description for AOM encoding options. There are some documentations available online. However I get following contradicting explanations for aq-mode.
can someone help me with the correct documentation ?

  


  https://api.encoding.com/reference/adv-av1-libaom says the default value for aq-mode is 0 and "ffmpeg -h encoder=libaom-av1" gives default value = -1.

  


• FFmpeg concat playlist to multiple bitrate rtmp stream

  23 novembre 2016, par Kerr Yang

  I have an Adobe Media Server on Windows Server 2008R2 to deliver live streaming online.
  I use ffmpeg concat three playlist to three rtmp stream.

  But I found both three rtmp stream has same video bitrate.

  Does there a ffmpeg command I can setting multiple bitrate to output rtmp stream ?

  Thanks you.

  Command line

  c:\FFmpeg\ffmpeg.exe -loglevel warning -xerror -re -f concat -safe 0 -i c:\ch3-plist-3.txt -c copy -f flv "rtmp://192.168.15.231:1935/live/live-ch3-3?adbe-live-event=liveevent&adbe-record-mode=record" -i c:\ch3-plist-2.txt -c copy -f flv "rtmp://192.168.15.231:1935/live/live-ch3-2?adbe-live-event=liveevent&adbe-record-mode=record" -i c:\ch3-plist-1.txt -c copy -f flv "rtmp://192.168.15.231:1935/live/live-ch3-1?adbe-live-event=liveevent&adbe-record-mode=record" 

  RTMP stream url

  1. rtmp ://192.168.15.231:1935/live/live-ch3-3

     want to set video bitrate 2000k

  2. rtmp ://192.168.15.231:1935/live/live-ch3-2

     want to set video bitrate 1200k

  3. rtmp ://192.168.15.231:1935/live/live-ch3-1

     want to set video bitrate 500k

  File list

  ( PS : each file has convert to 500k,1200k and 2000k H.264 mp4 )

  1. ch3-plist-3.txt

     file F:/video/G002001_0804_2000k.mp4
     
     file F:/video/G002001_0893_2000k.mp4
     
     file F:/video/G004002_0062_2000k.mp4

  2. ch3-plist-2.txt

     file F:/video/G002001_0804_1200k.mp4
     
     file F:/video/G002001_0893_1200k.mp4
     
     file F:/video/G004002_0062_1200k.mp4

  3. ch3-plist-1.txt

     file F:/video/G002001_0804_500k.mp4
     
     file F:/video/G002001_0893_500k.mp4
     
     file F:/video/G004002_0062_500k.mp4

• ffmpeg stream saving in python3

  25 novembre 2016, par b9703

  im trying to write a python script (for Windows OS) that can call on ffmpeg to recieve and save a live stream for later viewing. The initial call (subprocess.Popen(ARGS)) works as intended (start the stream saving) however i cant figure out how to programmatically end the process in a way that allows ffmpeg to finish its work. manually i can just press ’q’ or ’Ctrl-C’ and ffmpeg will produce a playable file.

  command = ['ffmpeg', '-i',
  
          url,
  
          '-acodec', 'copy',
  
          '-vcodec', 'copy',
  
          destination]
  
  
  
  recording = Popen(command)

  i have tried using recording.terminate() which didn’t work. I’ve also tried (although i’m pretty sure i did it wrong) using recording.communicate(b’q’) to send a message to the process. All solutions i’ve found online have failed in the same way (file is unreadable). I really dont know much about the subprocces module or about the intricacies of processes so i may be missing something obvious. I just want to end the ffmpeg process in a non-abrupt manner.