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• avcodec : add a subcharenc mode that disables UTF-8 check

  24 mars 2018, par wm4

  avcodec : add a subcharenc mode that disables UTF-8 check
  This is for applications which want to explicitly check for invalid
  
  UTF-8 manually, and take actions that are better than dropping invalid
  
  subtitles silently. (It's pretty much silent because sporadic avcodec
  
  error messages are so common that you can't reasonably display them in a
  
  prominent and meaningful way in a application GUI.)
  

  • [DH] doc/APIchanges
  • [DH] libavcodec/avcodec.h
  • [DH] libavcodec/decode.c
  • [DH] libavcodec/options_table.h
  • [DH] libavcodec/version.h

• Seeing Blank video when using Xvfb with ffmpeg in headless mode

  4 avril 2022, par sxg

  Seeing blank video while running protractor tests in headless mode using Xvfb, ffmpeg, protractor video reporter

  



  I am using protractor framework for running automation tests. I am using protractor video recorder tool to record video on headless mode. The prerequisite for that is to start Xvfb at the background.

  



  This the setting i am using to run test in headless mode.
Steps followed to enable video in headless mode :

  



  Installed "npm i protractor-video-reporter"
Included ffmpeg setting for docker/linux.
```
 var VideoReporter = require('protractor-video-reporter');
 jasmine.getEnv().addReporter(new VideoReporter({
    baseDirectory: 'reports/videos',
    singleVideo: false,
    saveSuccessVideos: true,
    ffmpegCmd: '/usr/bin/ffmpeg',
    ffmpegArgs: [
      '-y',
      '-r', '30',
      '-f', 'x11grab',
      '-s', '1280x1024',
      '-i', 'process.env.DISPLAY',
      '-g', '300',
      '-vcodec', 'mpeg4'
    ]
  }));


  



      Executed "Xvfb :99 -ac -screen 5 1024x768x8 -listen tcp &" in a terminal
    Executed ```
       DISPLAY=:99  
       export $DISPLAY
``` in a separate window 
    Executed "env DEBUG=protractor-video-reporter protractor conf.js" in a separate terminal

Expected Result:

A video with the recordings that runs tests on google chrome

Actual Result:

Video is getting created but the video appears to be blank.

Chrome Version:73
Chromedriver Version: 2.46
Protractor version:5.4.2


  


• Record video with Xvfb + FFmpeg using Selenium in headless mode

  12 mars 2024, par ifdef14

  I am trying to record video using Selenium in headless mode. I am using Xvfb and FFmpeg bindings for Python. I've already tried :

  


  import subprocess
import threading
import time

from chromedriver_py import binary_path
from selenium import webdriver
from selenium.webdriver.chrome.service import Service
from xvfbwrapper import Xvfb


def record_video(xvfb_width, xvfb_height, xvfb_screen_num):
    subprocess.call(
        [
            'ffmpeg',
            '-f',
            'x11grab',
            '-video_size',
            f'{xvfb_width}x{xvfb_height}',
            '-i',
            xvfb_screen_num,
            '-codec:v',
            'libx264',
            '-r',
            '12',
            'videos/video.mp4',
        ]
    )


with Xvfb() as xvfb:
    '''
    xvfb.xvfb_cmd[1]) returns scren num
    :217295622
    :319294854
    :
    '''
    xvfb_width, xvfb_height, xvfb_screen_num = xvfb.width, xvfb.height, xvfb.xvfb_cmd[1]
    thread = threading.Thread(target=record_video, args=(xvfb_width, xvfb_height, xvfb_screen_num))
    thread.start()
    opts = webdriver.ChromeOptions()
    opts.add_argument('--headless')
    try:
        driver = webdriver.Chrome(service=Service(executable_path=binary_path), options=opts)
    finally:
        driver.close()
        driver.quit()



  


  As much as I understand xvfb.xvfb_cmd[1] returns an information about virtual display isn't it ? When I executed this script, I got the error message :

  


  [x11grab @ 0x5e039cfe2280] Failed to query xcb pointer0.00 bitrate=N/A speed=N/A    
:1379911620: Generic error in an external library


  


  I also tried to use the following commands :

  


  xvfb-run --listen-tcp --server-num 1 --auth-file /tmp/xvfb.auth -s "-ac -screen 0 1920x1080x24" python main.py &

  


  ffmpeg -f x11grab -video_size 1920x1080 -i :1 -codec:v libx264 -r 12 videos/video.mp4

  


  In the commands above, there are used xvfb-run --server-num 1 and ffmpeg -i :1, why ?

  


  Overall, when Selenium is running in the headless mode what's going on behind the scenes ? Is it using virtual display ? If yes, how can I detect display id of this, etc. Am I on the right path ?

  


  I am not using Docker or any kind of virtualization. All kind of tests are running on my local Ubuntu machine.