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• Multiple live video outputs advice. Live stream/Record/Preview, FFMPEG, Windows, Decklink [closed]

  18 septembre 2024, par stroltz

  I am looking for advice on how best to achieve multiple live video outputs.

  


  The live source is a Decklink card on Windows. (We have a ffmpeg build working to access the card) We want 4 outputs ;

  


  


  • We want to run a preview window (low quality would be preferred) just so the user can see the video is working.

    


  


  • We want to be able to live stream - single bit rate, RTMP. (goes up to a CDN)

    


  


  • Independent from the streaming we want to be able to stop and start recording to file. Ideally using CRF. So a separate encode – but maybe we use the RTMP encode, not sure, and do 1 x encode only.

    


  


  • We also want to save a separate audio file. Stops and starts at the same time as the video file above (if required we could do this as a post process on the video file we make above)

    


  


  


  We want to keep CPU use down to as reasonable as possible. (so no high end hardware)

  


  We have had a suggestion of this with ffmpeg ;

  


  Input >> ffmpeg

  


  

  • split input to main and monitoring ;

  


  • scale monitoring stream to lower resolution

  


  • encode both streams

  


  • provide both outputs to local streaming server
ffmpeg >> local streaming server

  


  • use API to start and stop recordings (or web console, if you do it manually)

  


  • provide streams to CDN or/and provide access to your streams for end users

  


  


  recorded files >> another ffmpeg (controlled by some script that get
RECORDING COMPLETED event to start ffmpeg process)

  


  

  • extract audio from recorded file

  


  • save audio into file

  


  


  Which sounds possible, but if doing that, which local streaming server would work best (open source, API...)

  


  or open to other ideas as to the best way.

  


  https://trac.ffmpeg.org/wiki/Creating%20multiple%20outputs shows lots of ways, but I don't think you get to control the individual outputs independently.

  


• Best way to combine 16 live streams into a live 4x4 collage within Linux [duplicate]

  13 mars 2013, par CoryG

  This question already has an answer here :

  • How to combine multiple ffmpeg streams into a single 4x4 collage ?
    

    1 answer

  I'm setting up a CCTV system with two 8ch capture cards in a Linux box and am looking for the most efficient way to combine all 16 channels into a 4x4 grid and send it straight to the VGA output of a machine. Is this possible without running a window manager - and if not what is the best way to handle this ? So far I'm leaning toward ffmpeg but am not sure how best to combine the streams.

• Show video while saving it

  13 septembre 2022, par Mohamed Adel El-Badry

  I have a folder full of images, I need to save these images into the video while doing so I want to show the user the video being played from these images (frames). I can run two separate processes one for the saving and one for the showing but this is not what I am looking for, I want to do both in one step. If you know a solution please let me know.

  


  My code uses C++ with OpenCV but feel free to share with me any code written with any language, or event a concept.

  


  I use gStreamer, ffmpeg as well for the video generation, so I am not looking how to save a video or how to show the video I am looking for a process that can do both in one operation.