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• transcode segment files without stutter for http live streaming

  28 juillet 2015, par zerocap

  I segmented a multicast video stream into small ts files for my HTTP live streaming service and it worked quite well. Then I found the bitrate of the source was too high (1.5mbps) so I set up a background job to transcode the ts files to a smaller bitrate (500kbps) using FFmpeg. The problem is that the 500k .m3u8 playback stutters(on every new file’s loading) and is not as smooth as the 1.5mbps one.

  My transcoding command line is like following :

  ffmpeg -i /home/rca/tst.ts -f mpegts -acodec libmp3lame -ar 48000 -ab 64k -vcodec libx264 -b 500k /home/rca/tst.ts

  Any ideas for this ? Thank you !

• Live stream images to a compressed video stream that's serveable in the browser

  20 juillet 2017, par Matt

  I’m looking to take a live stream of jpeg convert them into a compressed video and serve that video to the browser. Does anyone know the best way to accomplish that ? It looks like this :

  source => jpeg stream => codec => video stream => browser

  This is a live interactive source, so this whole process would need to be pretty snappy.

• NGinx RTMP live stream text overlay and play to multiple

  25 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).

  



  Thanks so much !

  



  Chris

  



  rtmp {
server {
                listen 1935;
                chunk_size 4096;

                application live {
                                    live on;
                                    record off;
                                    exec_static /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" rtmp://localhost:1935/overlay/test;
                                    #push rtmp://localhost:1935/overlay;
                                    #exec ffmpeg -i rtmp://your_localhost_ip/live/test -crf 30 -preset ultrafast -acodec aac -strict experimental -ar 44100 -ac 2 -b:a 64k -vcodec libx264 -x264-params keyint=60:no-scenecut=1 -r 30 -b:v 500k -s 1280x720 -f flv rtmp://jp.pscp.tv:80/x/your_stream_key;
                }

                application overlay {
                                    live on;
                                    record off;
                                    push rtmp://a.rtmp.youtube.com app=live2 playpath=yjsh-402y-xv3k-2qdj;
                                    exec_push /usr/local/bin/ffmpeg -i rtmp://localhost:1935/overlay/$name -vf fps=1/60 /Users/Shared/stream/netcam.jpg;
                }

        }

}