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• avutil/avutil: make AV_TIME_BASE_Q available in C++

  18 September 2023, by Zhao Zhili

  avutil/avutil: make AV_TIME_BASE_Q available in C++
  ISO C++ forbids compound-literals. It's not available with MSVC.
  
  This is a known issue from 10 years ago, and that's why there is a
  
  av_get_time_base_q().
  Since we have no plan to remove AV_TIME_BASE_Q, just make it
  
  available in C++.
  There are multiple choices:
  
  1. Use C++11 syntax: AVRational1, AV_TIME_BASE
  Users may still use C++98 to write new code. So no.
  2. Use av_get_time_base_q().
  It's for this purpose. But it's not compile time constants as
  
  AV_TIME_BASE_Q in C.
  So I choose av_make_q() as Anton's suggestion.
  https://libav-devel.libav.narkive.com/ZQCWfTun/patch-0-2-fix-avutil-h-usage-from-c
  
  Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>
  

  • [DH] doc/APIchanges
  • [DH] libavutil/avutil.h
  • [DH] libavutil/version.h

• What is the Best Approach for Storing and Displaying Video Files as Base64 in HTML for High Performance and Efficiency? [closed]

  25 August 2023, by Barthez

  I'm currently working on a project where I need to allow users to upload videos, which will then be converted to Base64 and embedded within an HTML file. I'm reaching out to gain a better understanding of the best practices for accomplishing this task while adhering to Stack Overflow guidelines.Here's my plan so far:Video Upload: Users will be able to upload videos through a web interface.Conversion to Base64: The uploaded video will be converted to Base64 using [specific library/tool].Embedding in HTML: The Base64 encoded video will be embedded within an HTML file using the tag.Before I proceed, I have a few questions:Are there any particular libraries or tools you recommend for converting videos to Base64 efficiently?What are the potential performance implications of embedding Base64 videos in HTML files, especially considering large video files?Are there any security concerns I should be aware of when implementing this process?How can I ensure cross-browser compatibility when embedding these Base64 videos?Are there any alternatives to this approach that might be more efficient or manageable?I want to make sure I'm following best practices and avoiding any pitfalls, so any insights, tips would be greatly appreciated. Thank you for your time and assistance!

  


  I attempted to convert an uploaded video to Base64 and embed it within an HTML file.

  


• asm SIMD sniffer

  1 August 2023, by Андрей Тернити

  There is x264.
It use a lot of x86 asm files. For example pixel-32.asm.
This files can use different SIMD instruction set: mmx, 3DNow!, sse family, others

  


  I need the simple way to automatically analyze every file. I want get which SIMD family in which file are used. How?

  


  I think every asm file must contain information about which SIMD family it use (or information that no SIMD). Without this information it is very bad idea try to use this files...
  
I am angry, my x86 CPU support mmx and 3DNow! only, but x264 try call sse, so I get "Illegal instruction" sometimes. I plan to make patch for x264.

  


  P.S. If you can make issues in official repo let me know.

  


  P.P.S. This thread on Doom9 (mirror).