Recherche avancée

Sur d’autres sites (3771)

• Python Azure Function Blob trigger concurrency problem

  22 août 2024, par Mihai Podaru

  I developed an OCR in python using pytesseract and cv2. It takes files for a blob container and extracts text from them. I deployed it to an Azure Function container. I used a container because I need system dependencies (poppler-utils tesseract-ocr ffmpeg libsm6 libxext6).

  


  If I simulate the function locally using Azurite I am able to process multiple files at a time. But if I deploy it to Azure, if I upload 2 files at once, the CPU goes to 100% and blocks there. I figured there is a concurrency problem, because it runs well if I configure the host file like this

  


  "extensions": {
    "blobs": {
      "maxDegreeOfParallelism": 1,
      ...
    }
}


  


  Can I do something about it or are the libraries/dependencies not compatible with concurrency ?

  


• HTML5 transparent video with the greatest cross-browser/system support

  22 juin 2022, par Will Ashworth

  I'm encountering an issue getting videos with alpha transparency to reliably load and play on a web page. After some thorough research, this is where I ended up as a means of video encoding to accomplish transparent video which isn't over a solid background color.

  


  Hoping the general community has insight into why we're noticing weirdness with MacOS Monterey in Safari 15 🤷‍♂️

  


  Note : We tried Lottie as an option for the animations, but what we found was that the DOM was excessively bloated ; which would inevitably cause performance issues for the website. So we went back to video as an option.

  


  Convert to HEVC with alpha

  


  ffmpeg -i "source.mov" -c:v hevc_videotoolbox -allow_sw 1 -alpha_quality 1 -vtag hvc1 output.mov


  


  Convert to VP9 with alpha

  


  ffmpeg -i "source.mov" -c:v libvpx-vp9 output.webm


  


  HTML5 method of serving these files to the browser

  


  <video autoplay="autoplay" loop="loop" muted="muted" playsinline="playsinline" class="tmpl-front-page__transition-item tmpl-front-page__transition-item--0 tmpl-front-page__transition-item--banner-video">&#xA;    <source src="path/to/video.mov" type="&#x27;video/mp4;" codecs="hvc1">&#xA;    <source src="path/to/video.webm" type="video/webm">&#xA;</source></source></video>&#xA;

  


  How it works

  


  Essentially, we've learned the following :

  


  

  • Safari supports HEVC with alpha, Chrome does not

  


  • Chrome supports VP9 with alpha, Safari does not

  


  


  Now we let the browser choose which version it wants to use.

  


  There are issues

  


  There's inconsistency in how reliably this works in reality. For example, I'm currently running MacOS Catalina with Safari 14.0.2, and the videos started loading for me when using the above method.

  


  While testing MacOS Monterey with Safari 15.1 inside a Parallels VM, the video doesn't load at all when I test that way. That said, another developer on our team did take the plunge and upgraded to Monterey and has Safari 15.1 ; and he can see the videos loading just fine.

  


  This is getting a little silly, and I'm not sure what else to try. Thanks for any help !

  


• Revision 1ba91a84ad : Adds a new subpel motion function Adds a new subpel motion estimation function

  8 août 2013, par Deb Mukherjee

  Changed Paths :
   Modify /vp9/encoder/vp9_mcomp.c

  
   Modify /vp9/encoder/vp9_mcomp.h

  
   Modify /vp9/encoder/vp9_onyx_if.c

  
   Modify /vp9/encoder/vp9_onyx_int.h

  
   Modify /vp9/encoder/vp9_rdopt.c

  
  
  Adds a new subpel motion function

  Adds a new subpel motion estimation function that uses a 2-level
  tree-structured decision tree to eliminate redundant computations.
  It searches fewer points than iterative search (which can search
  the same point multiple times) but has the same quality roughly.

  This is made the default setting at speeds 0 and 1, while at
  speed 2 and above only a 1-level search is used.

  Also includes various cleanups for consistency and redundancy removal.

  Results :
  derf : +0.012% psnr
  stdhd : +0.09% psnr
  Speedup of about 2-3%

  Change-Id : Iedde4866f5475586dea0f0ba4cb7428fba24eee9