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• NGinx RTMP live stream text overlay and push to multiple

  26 avril 2020, par chrisale

  I have been banging my head against this wall for a long time. Hoping you all can get me over.

  



  I have a live stream coming from an IP Camera to my computer.

  



  Nginx publishes to YouTube and to an FFmpeg stream that takes a frame every minute to use for a static webcam image.

  



  Here is the code with the exec_push that I've tried to use with no success. The YouTube stream and frame capture work fine. I have FFmpeg installed with freetype. This is all on MacOS X 10.15.4 Catalina with home-brew FFmpeg —HEAD installed.

  



  Update : I should also say I have tried outputting the overlay using command line FFmpeg and it works great with this command :

  



  /usr/local/bin/ffmpeg -i rtmp://localhost:1935/live/68.1. -vf drawtext="fontfile=/System/Library/Fonts/Supplemental/Arial.ttf:text='Stack Overflow': fontcolor=white: fontsize=24: box=1: boxcolor=black@0.5: boxborderw=5: x=(w-text_w)/2: y=(h-text_h)/2" /Users/user/Desktop/test.mp4


  



  So it seems that the output portion is the part FFmpeg doesn't like in Nginx.conf

  



  My thought is I should be passing the overlayed FFmpeg stream to the "overlay" app and have the stream published to Youtube and the frame capture from there. (And also potentially recorded).

  



  Update : When I have tried point to a sh file to run the command rather than the direct FFmpeg exec_push I get :

  



  [alert] 56849#0: kevent() error on 15 filter:-1 flags:4002 (2: No such file or directory)


  



  Thanks so much !

  



  rtmp {
server {
       listen 1935;
       chunk_size 4096;

       application live {
                live on;
                record off;
                exec_push /usr/local/bin/ffmpeg -i rtmp://localhost:1935/live/68.1. -vf drawtext="fontfile=/System/Library/Fonts/Supplemental/Arial.ttf:textfile=/Users/Shared/overlayescaped.txt: reload=1: fontcolor=white: fontsize=20: box=1: boxcolor=black@1: boxborderw=75: x=70: y=925" -c:v libx264 -maxrate 6000k -bufsize 4000k -c:a aac -b:a 160k -ar 44100 -b:a 128k -f mp4 rtmp://localhost:1935/overlay/test;
                #push rtmp://localhost:1935/overlay;

                }

        application overlay {
                live on;
                record off;
                push rtmp://a.rtmp.youtube.com app=live2 playpath=yourstreamkey;
                exec_push /usr/local/bin/ffmpeg -i rtmp://localhost:1935/overlay/$name -vf fps=1/60 /Users/Shared/stream/netcam.jpg;
                }

        }

}


  


• ffmpeg live stream sound desynch

  26 août 2017, par greg

  I’m trying to use ffmpeg to re-encode a live rtmp stream like this :

  ffmpeg -stream_loop -1   -r 25 -i rtmp://127.0.0.1:1935/live/input -c:a aac -b:a 128k -vf scale=600:356  -c:v libx264 -vprofile baseline -b:v 500K -f flv rtmp://127.0.0.1:1935/live/test

  It’s working but the sound is about 2 seconds late over the video.

  What can I do to fix this ?

  Thanks in advance

• How to video-record selenium tests running headless inside a docker ?

  1er juin 2021, par Alex

  I am running python-selenium tests inside a docker using a headless firefox.

  


  During these tests I am able to make screenshots with the selenium method for screenshots - but can I use something to 'video' record the virtual display during the whole test (several test scripts with several test methods, with many webdrivers started and stopped).

  


  So how can I video-record a complete test session ?

  


  Addendum : I have found a webpage that describes exactly what I need : here. Unfortunately I get an error when I try to do the recording. Here are the commands I am doing :

  


  xvfb-run --listen-tcp --server-num 44 --auth-file /tmp/xvfb.auth -s "-ac -screen 0 1920x1080x24" python seltest.py &
ffmpeg -f x11grab -video_size 1920x1080 -i 127.0.0.1:44 -codec:v libx264 -r 12 /tmp/behat_1.mp4


  


  and the error is (for the second command) :

  


  [x11grab @ 0x1d289c0] Cannot open display 127.0.0.1:44, error 1.
127.0.0.1:44: Input/output error