0

(ngnix configure file) OBS send to transcode->

application transcoder
{ exec ffmpeg -y -i rtmp://localhost/transcoder -b:v 6000k -minrate 5500k -maxrate 6500k -bufsize 7000k -vcodec libx264 -preset medium -s 1920x1080 -sws_flags bicubic -r 60 -x264-params hal-hrd=cbr:force-cfr=1:keyint=120 -pass 1 -an -f flv /dev/null;

exec ffmpeg -i rtmp://localhost/transcoder -b:v 6000k -minrate 5500k -maxrate 6500k -bufsize 7000k -vcodec libx264 -preset medium -s 1920x1080 -sws_flags bicubic -r 60 -x264-params hal-hrd=cbr:force-cfr=1:keyint=120 -pass 2 -acodec aac -ab 160k -strict -2 -f flv rtmp://localhost/transcoded-1080/; }

application transcoded-1080 { push rtmp://...

}

How to write to get 2-pass streaming ???

1

You can't. 2 pass works by encoding the stream once for "practice" and using that information to establish a bitrate budget when doing the second pass for real. For pass 1 to complete, it needs the entire stream beginning to end. 2 pass for live video is an oxymoron.

The one exception is nvenc. nvenc has a rate control mode nvidia calls "2 pass", but its not the same two pass as x264.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.