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• Pipe PhantomJS output to FFmpeg

  10 avril 2017, par Hasse Andersen

  I am running PhantomJS using Selenium WebDriver (C#).

  I’m trying to video record my browser using FFmpeg as shown in the 2 tutorials :

  https://mindthecode.com/recording-a-website-with-phantomjs-and-ffmpeg/

  https://gist.github.com/phanan/e03f75082e6eb114a35c

  As explained in the tutorials, I’ll need to pipe output the phantomJS process to ffmpeg.

  I know how to add arguments to phantomjs, like the following :

      var svz = PhantomJSDriverService.CreateDefaultService();
  
      svz.AddArgument("ffmpeg -y -c:v png -f image2pipe -r 24 -t 10  -i - -c:v libx264 -pix_fmt yuv420p -movflags +faststart output.mp4");
  
      var driver = new PhantomJSDriver(svz);

  However, I don’t know how to add the argument as pipe. I have tried adding the pipe symbol before the actual argument but that doesn’t seem to work.

  So, my question is, how do I pipe the output of PhantomJS using selenium webdriver ?

• FFMpeg - Static Blurred Background Image

  21 avril 2020, par John Doe

  I have an ffmpeg command which takes a concat list of images and creates a slideshow, each image slowly zooming out for 10 seconds, then slaps a transparent overlay image ontop and adds music.

  



  This works fine, but I am currently stretching the input images to fit the 1920x1080 resolution. Would it be possible to create a static blurred+stretched background of the image whilst the original image is infront with the zoom effect intact ?

  



  Here's the code :

  



  ffmpeg -y -hide_banner -safe 0 -f concat -i "concat.txt" -i "overlay.png" -i "music.mp3" -filter_complex "[0]scale=3840x2160,zoompan=z='if(lte(zoom,1.0),1.25,max(1.001,zoom-0.0012))':x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)':fps=20:d=200:s=1920x1080[p];[p][1]overlay, drawtext=fontfile=Heathergreen.otf:text=TEXT:fontcolor=black:fontsize=62:x=135:y=940, drawtext=fontfile=voxbox.ttf:text='TEXT':fontcolor=white:fontsize=70:x=120:y=885[outv]" -map "[outv]" -map 2:a -pix_fmt yuv420p -c:v libx264 -x264-params keyint=80:scenecut=0 -c:a aac -aspect 16:9 -preset veryfast -shortest -movflags faststart -fflags genpts -r 20 "output.mp4"


  



  Here's the effect I need, but with the front image zooming out, as in the code above.


  



  I've had success using -filter_complex "[0]scale=-1:1080[in];[0]scale=1920:1080,boxblur=10:10,setsar=1[bg];[bg][in]overlay=(W-w)/2:(H-h)/2" for similar jobs but I can't seem to integrate it with this code. I'd really appreciate some help here.

  



  Thanks.

  


• lavc/vaapi_av1 : Avoid sending the same slice buffer multiple times

  8 mai 2024, par David Rosca

  lavc/vaapi_av1 : Avoid sending the same slice buffer multiple times
  When there are multiple tiles in one slice buffer, use multiple slice
  
  params to avoid sending the same slice buffer multiple times and thus
  
  increasing the bitstream size the driver will need to upload to hw.
  Reviewed-by : Neal Gompa <ngompa13@gmail.com>
  
  Signed-off-by : David Rosca <nowrep@gmail.com>
  
  Signed-off-by : Haihao Xiang <haihao.xiang@intel.com>
  

  • [DH] libavcodec/vaapi_av1.c