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• How to use ffmpeg.wasm in Firefox without getting the SharedArrayBuffer ?

  28 décembre 2020, par Pedro Henrique

  I'm trying to load ffmpeg.wasm in a react app to do a small video converter project. The code is working fine on chrome, but in firefox dev edition (83.0b) I catch the following error :

  


  


  ReferenceError : SharedArrayBuffer is not defined

  


  


  Here's the part of the component where the error is catched (the variable ready is never becomes true) :

  


  import React, { useState, useEffect } from 'react'
import styles from './App.module.css'
import { createFFmpeg, fetchFile } from '@ffmpeg/ffmpeg'
const ffmpeg = createFFmpeg({ log: true })

function App() {
  // load state
  const [ready, setReady] = useState(false)
  // files state
  const [video, setVideo] = useState('')
  const [gif, setGif]   = useState()
  // UI state
  const [dragOver, setDragOver ] = useState(false)
  const [nOfEnters, setNOfEnters] = useState(0)

  const load = async () => {
    try {
      await ffmpeg.load()
      setReady(true)
    } catch(error) {
      console.log(error)
    }
  }

  useEffect(() => {
    load()
  }, [])


  


  Thanks in advance, let me know if I should've provided any more detail.

  


• Resolving rtmp stream url from Adobe Flash container

  14 avril 2013, par Mustafe

  How can a rtmp stream url be retrieved completely with its playpath and be played with ffplay/avconv from a flash plugin. In embedded flash code below rtmp address exits (rtmp ://live.atv.com.tr/atv) , however it does not work with avplay since it needs playpath.

  /i.tmgrup.com.tr/p/flowplayer.controls.swf"},"influxis":{"url":"http://i.tmgrup.com.tr/p/flowplayer.rtmp.swf","netConnectionUrl":"rtmp://live.atv.com.tr/atv"},"ova":{"url":"http://i.tmgrup.com.tr/p/ova.swf","autoPlay":true,"overlays":{"regions":[{"id":"Reklam","verticalAlign":"bottom","horizontalAlign":"right","backgroundC...0,"style":".smalltext { font-style: italic; font-size:10; }"}]},"ads":{"notice":{"show":true,"region":"my-ad-notice","message":"<p class="\&quot;smalltext\&quot;" align="\&quot;right\&quot;"> Kalan süre : _countdown_ saniye.</p>"},"schedule":[{"zone":"5","position":"pre-roll","server":{"type":"direct","apiAddress":"http%3a%2f%2fad.reklamport.com%2frpgetad.ashx%3ftt%3dt_atv_canli_yayin_preroll_800x700%26vast%3d2"}}]}}},"playerId":"live","playlist":[{"eventCategory":"Canli Yayin","url":"atv3","live":true,"provider":"influxis"}]}" name="flashvars">

  Problem Solved : Using wireshark (network analyzer) is much more effective to retrieve paramaters like rtmp url, playpath...
  Edit2 : Some urls are also embedded in scripts files rather than directly in flash object, this variables are used in flash object above, later.

• Gstreamer : how to achieve the same effect as ffmpeg filter tmix

  2 février, par dudengke

  The ffmpeg command can smooth video :

  


  ffmpeg -i 1.h265 -vf "tmix=frames=3:weights=1 1 1" 2.h265


  


  Now i want to use gstreamer to smooth but I can't find the avfilter in gst-libav

  


  gst-launch-1.0 filesrc location=1.h265 ! decodebin ! videoconvert ! avfilter filter="tmix=frames=3:weights=1 1 1" ! videoconvert ! gstsink


  


  My question : Is there another way gstreamer can achieve the same effect as "tmix" in ffmpeg ?
I tried chatGPT, but the effect was not.

  


  gst-launch-1.0 filesrc location=1.h265 ! h265parse ! avdec_h265 ! videoconvert ! tee name=t \
t. ! queue ! identity single-segment=true ! videomixer name=mix sink_0::alpha=0.33 \
t. ! queue ! identity single-segment=true ! mix.sink_1 \
t. ! queue ! identity single-segment=true ! mix.sink_2 \
mix. ! gtksink