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• how to capture html5 video programmatically (headless)

  25 octobre 2019, par ygk

  I am trying to capture html5 video with js/css effects on it programmatically. I tried a couple of methods ;

  1. First I find this great blog post and implemented it. Everything was perfect till I found that phantomjs is not supporting html5 video tag so can not capture the video.

  2. Second option was to use headless chrome to take continuous screenshots and feed these screenshots into ffmpeg to create the video. Although it worked to some level headless chromes screenshots was taking some time.. I couldn’t create a smooth video..

  3. On my third try I gave a chance to chrome’s Page.startScreencast api. It could get video capture but frame rates was really problematic. The reason is that..

  4. Now I am working on xvfb + chrome/firefox + ffmpeg combination for capturing video as mentioned on that comment. Theoretically it is promising but I couldn’t managed to capture a video. Instead I have black screen..

  My setup is below :

  • light-http server having a simple video (web) within html5 video tag ; on localhost
  • start xvfb with Firefox and navigate to localhost/index.html ( video is there )
    xvfb-run --listen-tcp --server-num 44 --auth-file /tmp/xvfb.auth -s "-ac -screen 0 1440x685x24" firefox --headless http://localhost

  • start ffmpeg with x11grab parameter to grab frames from xvfb

    ffmpeg -f x11grab -video_size 1440x685 -i :44 -codec:v libx264 -r 12 ./output.mp4

  • the result is black video :)

  what should be the problem, how can I debug the problem ?

  ---

  ps : there is one more possible solution which I didn’t tried yet. As phantomjs has capability to capture canvas ; it may be possible to

  • put video into canvas
  • then capture the canvas

  It seems like a dirty workaround that is why not tried yet..

  ---

  UPDATE-1

  Tried to get screenshot with xwd -root -silent -display :44 -out screen.xwdand than convert to jpeg convert screen.xwd shot.jpg the result is black jpg..

• Pushing Projects to Github

  17 février 2012, par Multimedia Mike — Game Hacking, Python

  I finally got around to importing some old projects into my Github account. I guess it’s good to have a backup out there in the cloud.

  GhettoRSS
  https://github.com/multimediamike/GhettoRSS
  I describe this as a true offline RSS reader. Technically, it’s arguably not a true offline RSS reader. Rather, it does what most people actually want an offline RSS reader to do.

  I wrote this about 2 years ago when I had a long daily train ride with a disconnected netbook. I quickly learned that I couldn’t count on offline RSS readers simply because most RSS feeds to not contain much meat. Thus, I created a program that follows URLs in RSS feeds, downloads web pages and supporting images and CSS files, and caches them in an offline database which can be read via a local web browser.

  I wrote more information about this little project 2 years ago (here is part 1 and here is part 2). I fixed a few bugs in preparation for posting it but I probably won’t work on this anymore since I don’t have any use for it (the commute is long gone, but I didn’t even use it when I was commuting because I decided I just didn’t care enough to read the feeds on the train).

  xbfuse
  https://github.com/multimediamike/xbfuse
  This is a FUSE module for mounting Xbox/360 optical disc filesystems. Here is when I first discussed it. The tool has had its own little homepage for a long time. This tool has seen some development, as I learned from Googling for “xbfuse”. Regrettably, no one who has modified the tool has ever contacted me about it (at least, not that I can recall). This is unfortunate because the patches I have seen floating around which fix my xbfuse for various installations usually boil down replacing many occurrences of an include path in the autotool-generated build system. There is probably a simpler, cleaner fix.

  gcfuse
  https://github.com/multimediamike/gcfuse
  Written prior to xbfuse, this is a FUSE module for mounting GameCube optical disc filesystems. I first discussed this here and here. This tool has not seen too much direct development although someone eventually used it as the basis for WiiFuse which, as you can predict, mounts optical disc filesystems from Nintendo Wii games.

• Replace Special Characters In Batch-File Variable Feeding ffmpeg program

  14 janvier 2019, par whereswaller

  I am attempting to write a batch-file that leverages ffmpeg.exe to convert all files in a folder structure to mp3 format (specifically 128 KBps).

  My batch-file is presently unable to process filenames (constructed by concatenating the %_SOURCE% and %%~F variables) containing certain special characters generating the following errors :

  No such file or directory

  • … ellipsis sign
  • – en dash
  • — em dash
  • − minus sign

  Invalid argument

  • ‘ and ’ curved single quotation marks
  • “ and ” curved double quotation marks

  Invalid argument (yet sometimes passes depending on where symbol is in the filename, for example, seems to work if placed between the n and t of Dont in C:\Users\Test\Documents\Input\Peter Bjorn And John - I Know You Dont Love Me.mp3)

  • - hyphen
  • ! exclamation mark
  • ~ tilde
  • ' non-curved single quotation mark
  • = equals sign
  • + plus sign
  • % percentage sign
  • ( open bracket

  How can I modify my batch-file script so that the %%~F variable escapes these characters correctly ?

  Example current filename input : C:\Users\Test\Documents\Input\Peter Bjorn And John - I Know You Don't Love Me.mp3

  Example desired filename input : C:\Users\Test\Documents\Input\Peter Bjorn And John - I Know You Don"^'"t Love Me.mp3

  Script (see line beginning C:\ffmpeg\bin\ffmpeg.exe) :

  @echo off
  
  setlocal EnableExtensions DisableDelayedExpansion
  
  
  
  rem // Define constants here:
  
  set "_SOURCE=C:\Users\Test\Documents\Input" & rem // (absolute source path)
  
  set "_TARGET=C:\Users\Test\Documents\Output"  & rem // (absolute target path)
  
  set "_PATTERN=*.*" & rem // (pure file pattern for input files)
  
  set "_FILEEXT=.mp3"   & rem // (pure file extension of output files)
  
  
  
  pushd "%_TARGET%" || exit /B 1
  
  for /F "delims=" %%F in ('
  
      cd /D "%_SOURCE%" ^&^& ^(rem/ list but do not copy: ^
  
          ^& xcopy /L /S /Y /I ".\%_PATTERN%" "%_TARGET%" ^
  
          ^| find ".\" ^& rem/ remove summary line;
  
      ^)
  
  ') do (
  
      2> nul mkdir "%%~dpF."
  
  
  
      rem // Set up the correct `ffmpeg` command line here:
  
      set "FFREPORT=file=C\:\\Users\\Test\\Documents\\Output\\ffreport-%%~F.log:level=32"
  
      "C:\ffmpeg\bin\ffmpeg.exe" -report -n -i "%_SOURCE%\%%~F" -vn -c:a libmp3lame -b:a 128k "%%~dpnF%_FILEEXT%"
  
      if not errorlevel 1  if exist "%%~dpnF%_FILEEXT%" del /f /q "%_SOURCE%\%%~F"
  
  
  
  )
  
  popd
  
  
  
  endlocal
  
  pause