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• SharedArrayBuffer not defined when using Cypress

  15 janvier 2023, par unloco

  I'm using Vite and Cypress for dev and testing

  


  I'm loading ffmpeg, it loads fine on Chrome but on Cypress, it gives this error

  


  ReferenceError: SharedArrayBuffer is not defined


  


  Apparently, it's caused by cross origin isolation.

  


  I tried disabling web security in Cypress.json but it didn't help

  


  Sample code

  


  import { createFFmpeg } from "@ffmpeg/ffmpeg"

const ffmpeg = createFFmpeg({ log: true })
ffmpeg.load()



  


  Is there a workaround ?

  


  Minimal Repro
https://github.com/unlocomqx/cypress-ffmpeg

  


• Reducing latency of FFmpeg audio stream using Opus encoding

  28 septembre 2022, par Victor Almeida

  I'm trying to stream my microphone audio using FFmpeg, but there's a delay of about 3 seconds from when the audio is recorded to when it is played.

  


  The snippet below contains the minimal command for which I can reproduce the problem.

  


  ffmpeg -f dshow -i "audio=Microphone (Realtek(R) Audio)" -f opus - | ffplay -


  


  However, I've tried various other flags to no effect. Such as :

  


  

  • -analyzeduration 0

  


  • -loglevel 0

  


  • -audio_buffer_size 50

  


  • -fflags nobuffer

  


  • -flags low_delay

  


  • -acodec libopus

  


  


  Is there any way to reduce the latency to less than a second while still using Opus encoding ?

  


• File created in subprocess.run not found by os.listdir()

  13 novembre 2019, par Abitbol

  I am using subprocess to launch an instance of ffmpeg extracting frames in a folder. Then I do os.listdir on that same folder and it returns an empty list ; off course I would except to see the files created by ffmpeg listed.

  Here is a minimal example

  import os
  
  import subprocess
  
  
  
  folder = 'generated'
  
  subprocess.run(['ffmpeg', '-i', 'input.mp4', '-vf', 'fps=4', f'{folder}/%05d.png'])
  
  print(os.listdir(folder))  # []

  I can testify that the files are created while the script is running.

  In the full example I am using ffmpeg complex filter to generate two output, I don’t think that is the source of the problem.