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• Optimise ffmpeg hls stream to images

  10 mars 2017, par mrdotb

  I’m using a ffmpeg to convert a hls stream from twitch to 30 png images per seconds on stdout then I load them in python using pillow.

  My ffmpeg command is the fallowing.

  I get a hls stream from twitch using

  livestreamer --http-header Client-ID=mytwitchtoken --hls-live-edge 1 twitch.tv/stream source,1080p60 --stream-url

  Then my images using

  ffmpeg -i streamurl.m3u8 -vf fps=2 -nostats -pix_fmt rgb24 -vcodec rawvideo -f image2pipe -

  The ffmpeg command is working well however it’s resource intensive (100% of my cpu). Is there some optimization I can do on the command or another method to get my images from the hls stream.

• 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

  


• Decode an RTP stream, process it, and encode it again

  2 mai 2013, par pinoscotto

  i'm trying to receive an RTP stream (direct with an SDP file or from an RTSP server), decode it in something like an RGB matrix (to work on it with OPENCV), and encapsulate it again in a stream, to send it to another end point.

  I've tried live555, but it hasn't encoding/decoding, and support is mostly for keyframe formats.
  I've used ffmpeg whith success but only from the command line.

  I'm wondering if there's some smarter way of doing this.
  Thanks