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• Reload scrolling drawtext filter in ffmpeg only while off screen

  3 janvier 2021, par J45p3r

  I have a drawtext filter in ffmpeg that scrolls right to left on the bottom of the screen showing current weather data. The problem I have is the text file containing the weather data updates every 2 seconds and when the weather readings change the length of the text also changes. This causes the looping text to jump around. I tried using a conditional statement to set reload to 1 only if x was greater than the screen width but it seems reload doesn't evaluate conditional statements. Can anyone think of a way around this problem so that the text will only update once per loop, while off screen ?

  


  My command :

  


  ffmpeg -thread_queue_size 512 -re -rtsp_transport tcp -i "rtsp://192.168.x.x:7447" -i /YouTubeStream/CupolaCam/logo.png -f lavfi -i anullsrc -filter_complex "[0:v][1:v]overlay=20:925","drawbox=x=0:y=ih-35:w=iw:h=35:color=black@0.75:t=fill","drawtext=fontsize=30:fontcolor=white@.8:line_spacing=10:fontfile=/usr/share/fonts/truetype/Courier_Prime/CourierPrime-Regular.ttf:textfile=/YouTubeStream/CupolaCam/weatherdata/curtempformatted:y=h-line_h-5:x='if(gt(x\,-tw),w-mod(4*n\,w+tw)\,w)':reload=1" -c:v libx264 -profile:v high -bf 2 -g 15 -crf 18 -pix_fmt yuv420p -c:a aac -profile:a aac_low -b:a 128k -movflags faststart -f flv "rtmp://a.rtmp.youtube.com/live2/stream_key"


  


  The video on youtube : https://www.youtube.com/watch?v=Av6k8bf_2Zc

  


• capture video conference between 1:1 user and broadcast to an rtmp url

  20 octobre 2020, par Asif Alamgir

  I am currently working on nodejs and socket app that is currently doing 1:1 video conference that is using webrtc. Videos are two separate element in the html and i would like to merge them together so that i can broadcast to rtmp url for public view (2:many). Is this possible

  


  For webrtc, i followed this tutorial https://www.youtube.com/watch?v=DvlyzDZDEq4, and for broadcasting i am using ffmpeg which current does 1 video stream.

  


  Please confirm if this is doable

  


  Update

  


  I was able to merge the video using
https://www.npmjs.com/package/video-stream-merger

  


  And now the final issue

  


  i am receiving merger.result which is merged stream and I tried to create a mediaRecorder object. Callback method for MediaRecorder ondataavailable is called only once but not every 250ms which i need to broadcast to youtube. How can i do this ?

  


  var merger = new VideoStreamMerger(v_opts);
...
...
merger.start()
myMediaRecorder = new MediaRecorder(merger.result);
myMediaRecorder.start(250);
myMediaRecorder.ondataavailable = function (e) {
    console.log("DataAvailable")
    //socket.emit("binarystream", e.data);
    state = "start";
    //chunks.push(e.data);
}


  


• FFMPEG stream RTSP to RTMP (Youtube) add logo

  16 juin 2017, par Māris Purviņš

  To stream video from IP cam to Youtube I’m using code (through Ubunu) :
  ffmpeg -f lavfi -i anullsrc -rtsp_transport tcp -i rtsp ://user:psw@192.168.0.100:554 -tune zerolatency -vcodec libx264 -pix_fmt + -c:v copy -c:a aac -strict experimental -f flv rtmp ://a.rtmp.youtube.com/live2/ -nostdin -nostats /dev/null 2>&1 &

  It is a bee project for school
  I have two cameras and two streams :
  https://www.youtube.com/watch?v=ws-VcLXo-hI

  Everything is ok, but... I would like to know :
  1. How to add png logo to this strem. I have tried -i /home/user/rvvg_logo_round.png -codec:v libx264 -preset ultrafast -filter_complex overlay and another methods but without a result.
  2. Sometimes there is some problem during night and video streaming stops. How to automatically check process status and restart stream.
  I have tried to create sh file as described in http://videos.cctvcamerapros.com/raspberry-pi/ip-camera-raspberry-pi-youtube-live-video-streaming-server.html and put in cron job, bet that is only to check one cam process. Is there some better idea ?