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• mp4 Vj Animation video lagging hi res video

  21 février 2020, par Ryan Stone

  I am trying to get a video to play inside a video tag at the top left hand corner of my page, it loads ok, the resolution is good and it seems to be looping but it is lagging very much, definatly not achieving 60fps it is in mp4 format and the resolution on the original mp4 is 1920x1080 it is a hi resolution vj free loop called GlassVein, you can see it if you search on youtube. On right clicking properties it comes up with the following inforamtion ;

  Bitrate:127kbs
  Data rate:11270kbps
  Total bitrate:11398kbs
  Audio sample rate is : 44khz
  filetype is:VLC media file(.mp4)
  (but i do not want or need the audio)

  & it also says 30fps, but I’m not sure i believe this as it runs smooth as butter on vlc media player no lagging, just smooth loop animation

  I have searched on :https://trac.ffmpeg.org/wiki/Encode/AAC for encoding information but it is complete gobbldygook to me, I don’t understand a word its saying

  My code is so far as follows ;

      <video src="GlassVeinColorful.mp4" autoplay="1" preload="auto" class="Vid" width="640" height="360" loop="1" viewport="" faststart="faststart" mpeg4="mpeg4" 320x240="320x240" 1080="1080" 128k="128k">  
  
      </video>

  Does anyone know why this is lagging so much, or what I could do about it.
  it is a quality animation and I don’t really want to loose an of its resolution or crispness.. the -s section was originally set to 1920x1080 as this is what the original file is but i have changed it to try and render it quicker...

  Any helpful sites, articles or answers would be great..

  2020 Update

  The Solution to this problem was to convert the Video to WebM, then use Javascript & a Html5 Canvas Element to render the Video to the page instead of using the video tag to embed the video.

  Html

  <section>
  
          <video src="Imgs/Vid/PurpGlassVein.webm" type="video/webm" width="684" height="auto" muted="muted" loop="loop" autoplay="autoplay">
  
                 <source>
  
                 <source>
  
                 <source>
  
          </source></source></source></video>
  
          <canvas style="filter:opacity(0);"></canvas>
  
  </section>

  Css

  video{
  
     display:none !important;
  
     visibility:hidden;
  
  }

  Javascript

      const Canv = document.querySelector("canvas");
  
      const Video = document.querySelector("video");
  
      const Ctx = Canv.getContext("2d");
  
  
  
      Video.addEventListener('play',()=>{
  
        function step() {
  
          Ctx.drawImage(Video, 0, 0, Canv.width, Canv.height)
  
          requestAnimationFrame(step)
  
        }
  
        requestAnimationFrame(step);
  
      })
  
  
  
      Canv.animate({
  
          filter: ['opacity(0) blur(5.28px)','opacity(1) blur(8.20px)']
  
      },{
  
          duration: 7288,
  
          fill: 'forwards',
  
          easing: 'ease-in',
  
          iterations: 1,
  
          delay: 728
  
      })

  I’ve Also Used the Vanilla Javascript .animate() API to fade the element into the page when the page loads. But one Caveat is that both the Canvas and the off-screen Video Tag must match the original videos resolution otherwise it starts to lag again, however you can use Css to scale it down via transform:scale(0.5) ; which doesn’t seem to effect performance at all.

  runs smooth as butter, and doesn’t loose any of the high resolution image.
  Added a slight blur 0.34px onto it aswell to smooth it even more.

  Possibly could of still used ffmpeg to get a better[Smaller File Size] WebM Output file but thats something I’ll have to look into at a later date.

• How can I run this command in a shell script

  21 janvier 2011, par Sascha

  This is my shell script but it gives errors :

  #!/bin/sh
  
  
  
  while getopts "i:o:" flag
  
  do
  
     case $flag in
  
     i) file_input=$OPTARG
  
     ;;
  
     o) file_output=$OPTARG
  
     ;;
  
     esac
  
  done
  
  
  
  mplayer -nosound -benchmark -vo yuv4mpeg:file=>(x264 --demuxer y4m \
  
                --crf 20 --threads auto --output $file_output - ) $file_input

  The error message is :

  Can't get memory or file handle to write ">(x264 —demuxer y4m —crf 20 —threads auto —output video.264 - )" !FATAL : Cannot initialize video driver.

  When I run this cmd on putty :

  mplayer -nosound -benchmark -vo yuv4mpeg:file=>(x264 --demuxer y4m \
  
                --crf 20 --threads auto --output video.264 - ) video.wmv

  it works perfectly..

  What am I doing wrong ?

• How to create a FFMPEG VIDSTAB batch script Windows

  2 octobre 2019, par esdoublelef

  i’m a photographer and I download photographs (.jpg) and videos (.mov) into a single Windows folder

  I’m looking to create a script that will run the below 3 lines of FFMPEG for every instance of .mov in the folder and let it create stabilized .mp4 copies of the video. I’ll delete the originals manually later.

  ffmpeg -i DSCF0229.MOV -vf vidstabdetect=shakiness=5:accuracy=15:stepsize=6:mincontrast=0.3:show=2 -y dummy.mp4
  
  
  
  ffmpeg -i DSCF0229.MOV -vf scale=trunc((iw*1.15)/2)*2:trunc(ow/a/2)*2 -y scaled.mp4
  
  
  
  ffmpeg -i scaled.mp4 -vf vidstabtransform=smoothing=30:input="transforms.trf":interpol=linear:crop=black:zoom=0:optzoom=1,unsharp=5:5:0.8:3:3:0.4 -y DSCF0229stabilized.mp4

  i can tweak a bit of code, but i’m clueless on where to start. i tried "for do" and even a batch.bat file, but i just can’t get the proper syntax right.

  really appreciate any help here !!