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• hwcontext_vulkan : always attempt to map host memory when transferring

  25 novembre 2020, par Lynne

  hwcontext_vulkan : always attempt to map host memory when transferring
  This relies on the fact that host memory is always going to be required
  
  to be aligned to the platform's page size, which means we can adjust
  
  the pointers when we map them to buffers and therefore skip an entire
  
  copy. This has already had extensive testing in libplacebo without
  
  problems, so its safe to use here as well.
  Speeds up downloads and uploads on platforms which do not pool their
  
  memory hugely, but less so on platforms that do.
  We can pool the buffers ourselves, but that can come as a later patch
  
  if necessary.
  

  • [DH] libavutil/hwcontext_vulkan.c

• How to split a video up into 2.5GB parts with FFmpeg

  2 avril 2019, par Helmut S

  I am trying to achieve a way to send large video files through Firefox Send.

  Because Firefox Send has a 2.5 GB limit per file that one sends, I need to break up a video file into parts that are each less than 2.5GB.

  Is there a relatively simple way to reliably split a video based on data limits using FFmpeg, rather than using duration ? (Using duration would be unreliable, because different equal length portions of a video can be different sized)

  EDIT 1 : I apoligize for the lack of clarity, I was planning on using a Bash script using FFmpeg and ffsend. I was wondering if there is any way to do this through video processing rather than zip compression.

• Electron, Chromium and ffmpeg licencing confusion [closed]

  12 mars 2021, par Iamisti

  Intro :
Recently I'm working on an electron based application that is free to use but also has subscription based services.
It came to my attention that ffmpeg is shipped with electron, which has GPL/LGPL licence.

  


  My quetion is :

  


  

  • Am I legally able to still distribute the application and be licence-compliant with ffmpeg without owning any proper licence to it ? I thought chromium dealt with the licencing on this topic since so many applications nowadays are shipped with using electron and chromium under the hood.

  


  • How do I compile/build electron to make it licence compatible (in case its not ?)

  


  


  I did a lot of reseearch and I found out the followings :

  


  


  • ffmpeg is shipped with chromium, they built their own version of ffmpeg and it seems they also have licence for it. Although that might be that they just push the responsibility down on the software developer/company who distributes their application with chromium.
Chromium licence for ffmpeg : https://chromium.googlesource.com/chromium/third_party/ffmpeg/+/703e920bb75053bf6b87d41d198cbbfbce3fb7ad/LICENSE

    


  


  • Apparently ffmpeg has a checklist of how to be licence compliant. Does that mean if I do all these steps, I can still distribute the application and can legally use it ? Licence checklist for ffmpeg : http://ffmpeg.org/legal.html

    


  


  • checking out some popular electron applications like Discord, Figma, Slack, etc... they ALL have ffmpeg included cause of electron when you install them. I wonder how they made it legal ? I don't see any of these checklists done on any of these popular applications.

    


  


  


  I'm know very little regarding licences, so any help would be incredibly huge help for me.