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• Real time livestreaming - RPI FFmpeg and H5 Player

  29 avril 2022, par Victor

  I work at a telehealth company and we are using connected medical devices in order to provide the doctor with real time information from these equipements, the equipements are used by a trained health Professional.

  


  Those devices work with video and audio. Right now, we are using them with peerjs (so peer to peer connection) but we are trying to move away from that and have a RPI with his only job to stream data (so streaming audio and video).

  


  Because the equipements are supposed to be used with instructions from a doctor we need the doctor to receive the data in real time.

  


  But we also need the trained health professional to see what he is doing (so we need a local feed from the equipement)

  


  How do we capture audio and video

  


  We are using ffmpeg with a go client that is in charge of managing the ffmpeg clients and stream them to a SRS server.
This works but we are having a 2-3 sec delay when streaming the data. (rtmp from ffmpeg and flv on the front end)

  


  ffmpeg settings :

  


  ("ffmpeg", "-f", "v4l2", `-i`, "*/video0", "-f", "flv", "-vcodec", "libx264", "-x264opts", "keyint=15", "-preset", "ultrafast", "-tune", "zerolatency", "-fflags", "nobuffer", "-b:a", "160k", "-threads", "0", "-g", "0", "rtmp://srs-url")


  


  My questions

  


  

  • Is there a way for this set up to achieve low latency (<1 sec) (for the nurse and for the doctor) ?

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  • Is the way I want to achieve this good ? Is there a batter way ?

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  Flow schema

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  Data exchange and use case flow :

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  Note : The nurse and doctor use HTTP-FLV to play the live stream, for low latency.

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• Does anyone know any filters for better low quality video ?

  7 septembre 2022, par kasten

  So maybe my question can be closed, but anyway I'm researching and looking for a tool that can do the following with video files :

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  Here's an example of what I want :

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  When you put a low quality video on your TV and look into a mirror that reflects that image, it appears to be sharper, acting as a filter to improve the video.

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  I don't know if anyone has thought of this fact or if there is a software that does something similar. I know low quality video can't get any better, but why is there an improvement when looking in the mirror ?

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  I appreciate if anyone can comment, as I'm not a professional in video.

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• FFMPEG or GStreamer - HLS to UDP [closed]

  24 août 2023, par Alex Romero

  I can't manage to input HLS and output UDP on these two softwares correctly.

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  I'm trying to understand how to use these two softwares. I got better results using FFMPEG but somehow, I didn't manage adding a hls playlist that started with "https". It works with "http". What I found facsinating about this was that FFMPEG can even output UDP through the Ethernet port, by indicating the destination IP, which would be another computer/server. I'm not sure if GStreamer has this capability, since I'm starting to understand how it works.

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  I know HLS means HTTP Live Streaming and UDP stands for User Datagram Protocol.

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  Here are 2 of the examples I used for each software :

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  FFMPEG

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  ffmpeg -i https://hls_source -c:v libx264 -crf 23 -preset fast -c:a aac -s 1280x720 -f mpegts -bufsize 4000k -max_delay 1000000 -fflags nobuffer udp ://destination_ip:port ?pkt_size=1316

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  GStreamer(runs but not work)

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  gst-launch-1.0 souphttpsrc location=http://hls_source ! hlsdemux ! udpsink host=ip port=1234

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  I want to know if there's any way I can fix the FFMPEG playlist issue. If there isn't any solution, how can I fix the issue I'm having on GStreamer. All the testing was done through VLC Media Player. Any suggestions or recommendations are gratefully accepted. If I have to try another software that is focused on this, please let me know.

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