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• How to restrict fetching hls segment files on pause in Safari (MacOS and iOS)

  24 juillet 2021, par Charan Kumar

  We generate hls files with segment size of 3 seconds. We use hlsjs for non Safari browsers and Safari has native hls support.

  


  In hlsjs world we were able to restrict how much ahead we should be in terms of buffer using maxMaxBufferLength, where as we are unable to find similar solution for Safari. In Safari, after loading video m3u8, even if I pause after a second, in the network tab I can see that all the segments are being fetched which I would like to restrict.

  


  I'll not be able to share our examples due to company polices. But, a public example file by hls.js is attached below :

  


  https://test-streams.mux.dev/x36xhzz/url_6/193039199_mp4_h264_aac_hq_7.m3u8 try opening this url in Safari, and try pausing the video, you'll see that it continues to download. Where as if you open same one using https://hls-js.netlify.app/demo/ with maxMaxBufferLength : 5 it won't happen.

  


  Is there an option at ffmpeg to make it controlled buffer or some solution that we should do for Safari by listening to events ?

  


  Found the same question here -> https://developer.apple.com/forums/thread/121074

  


• ffmpeg save mp3 file from available wss stream

  11 juillet 2021, par phoenixAZ

  In a hello world node.js app I am succeeding in getting a feed from twilio conference and sending to the google speech to text. Concurrently I want to control recording to mp3 of the available audio stream (programmatically call start and stop). The was is subscribed to audio stream but I don't know how to attach ffmpeg to the local stream. I have tried :

  


              // ffmpeg('rtsp://host:port/path/to/stream')
            //experimenting telling it to use the local stream
            //
            //ffmpeg(wss.addListener)  //invlaid input error
            //ffmpeg(wss.stream) //thsi hits the console error below
            ffmpeg(wss.stream)
            .noVideo()
            .audioChannels(1)
            .audioBitrate(128)
            .duration('1:00')
            .on('end', function () { console.log('saved mp3'); })
            .on('error', function (err) { console.log('error mp3'); })
            .save('/path/to/output.mp3');


  


  Any suggestions are welcomed. I am in a node.js project

  


• ffmpeg drawtext surrounded by rounded rectangle

  7 juillet 2021, par andykais

  I want to use ffmpeg to recreate the text bubbles that appear in apps like tiktok. I created this example using imagemagick to illustrate what I mean :

  


  

  


  So far with ffmpeg, all I am able to create is text backgrounds with sharp corners :

  


  

  


  This was done with the following command :

  


  ffmpeg -i 'live-wallpaper.mp4' -vf "drawtext=text='Hello World':x=(w-text_w)/2:y=(h-text_h)/2:fontsize=100:fontcolor=black:box=1:boxcolor=white: boxborderw=8:fontfile='fonts/proximanova-semibold.otf'" output.mp4


  


  How can I get the output of ffmpeg to look more similar to the first image ? The text isn't always going to be "Hello World" either, so I need a solution that works for text that is shorter, longer, wraps, etc.