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• Watching a livestream that is being ripped by ffmpeg to disk - file updating problem

  22 mai 2021, par merlin

  I am automatically recording daily tv news with ffmpeg, so I can watch them later.

  


  ffmpeg -i https://mcdn.daserste.de/daserste/de/master.m3u8 -c copy Tagesschau.mkv


  


  This works. But let's say ffmpeg recorded for 2 minutes and I open the currently saved file and begin to watch the video stops after some time.
It doesn't continue playing (but ffmpeg is still recording so there must be more video).

  


  Strange thing is even by closing and reopening the file I don't see the new content. Sometimes I have to wait 1-2 minutes till the new content shows up. But in the file manager I see the file is growing in size continuous.

  


  But when I copy/paste the file e.g. in the same directory and reopen the file I can immediately see the complete video content up to date recorded.

  


  Maybe it has to do with file system write buffer ? I tried on ZFS and ext4 (mounted on a samba share). By copy/paste I "trigger" the file system to update the file content ?

  


  Is there a workaround so when I start watching it will play without stopping ?

  


• Decoder error not supported error when render 360 video on web application

  19 avril 2024, par Mattia Pompita

  I'm developing a simple scene with A-Frame and React.JS where there is a videosphere that will create and render when video are fully loaded and ready to play.

  


  My goal is to render 4k (to device who can reproduce it) video on videosphere to show at the users the environment.
On desktop versions all works fine also with 4K videos while on mobile works only for 1920x1080.

  


  I already check if my phone can render a 4k texture video and it can render untill 4096, I checked also that video.videoWidth are 4096.

  


  The error I have is with decoder

  


  MediaError {code: 4, message: 'DECODER_ERROR_NOT_SUPPORTED: video decoder initialization failed'}


  


  This error will show only on mobile, I can see it through Chrome Developer tools, I already try to re-encode both with Handbrake and ffmpeg but always the same error will appear on mobile.

  


  My video is hosted on Firebase and have this resolution 4096x2048
I'm testing on Google Pixel 7 already checked if WEBGL can render 4k texture on it

  


  I can't understand why decoder works fine on Desktop and not on mobile only with 4k video and with 1920x1080 it works

  


  This is the only component rendered on page

  


  import React, { useEffect, useRef } from 'react';

const XIV_360_Abbazia_San_Silvestro_4K = () => {
  const assetsRef = useRef(null);
  const videoRef = useRef(null);
  const sceneRef = useRef(null);


  return (
    
      
        > {
            console.log('CAN PLAY THROUGH');
            let videoSphere = document.createElement('a-videosphere');
            videoSphere.setAttribute('src', '#video360');
            sceneRef.current.appendChild(videoSphere);
          }}
        />
      
      

      > {
          videoRef.current.play();
        }}
      >
        PLAY
      
    
  );
};

export default XIV_360_Abbazia_San_Silvestro_4K;


  


• GUID appended for FFMPEG Output file

  8 juin 2020, par Jagadheeswaran Mohan

  Is it possible to append a GUID to the Ouput file ?

  



  I am running ffmpeg -i .\Tst.mp4 -filter:v "select='gt(scene,0.5)',showinfo" -vsync 0 -s 120x68 keyframe%05d.jpg

  



  Which produces a series of files, I need to append a GUID to every file. Kindly let me know how this can be done.