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• Programatically get non-overlapping images from MP4

  15 février 2013, par Carlos F

  My ultimate goal is to get meaningful snapshots from MP4 videos that are either 30 min or 1 hour long. "Meaningful" is a bit ambitious, so I have simplified my requirements.

  The image should be crisp - non-overlapping, and ideally not blurry. Initially, I thought getting a keyframe would work, but I had no idea that keyframes could have overlapping images embedded in them like this :

  Of course, some keyframe images look like this and those are much better :

  

  I was wondering if someone might have source code to :

  Take a sequence of say 10-15 continuous keyframes (jpg or png) and identify the best keyframe from all of them.

  This must happen entirely programaticaly. I found this paper : http://research.microsoft.com/pubs/68802/blur_determination_compressed.pdf

  and felt that I could "rank" a few images based on the above paper, but then I was dissuaded by this link : Extracting DCT coefficients from encoded images and video given that my source video is an MP4. Of course, this confuses me because the input into the system is just a sequence of jpg images.

  Another link that is interesting is :

  Detection of Blur in Images/Video sequences

  However, I am not sure if this will work for "overlapping" images.

  Any ideas ?

• appx cannot call exe file

  22 avril 2022, par MrL

  enter image description here

  


  I have developed an application with electron and intend to upload it to the windows app store. This software needs ffmpeg Exe, which can be used normally during the test, but I can't call ffmpeg after I package it into appx and install it Exe, I guess Microsoft may not allow developers to call exe files, but I'm not particularly sure. Is there any other way to call ffmpeg ?

  


• Location of the amd64 compiler in Visual Studio 2022 | Compiling FFmpeg with NVENC

  6 juin 2022, par Gal Grünfeld

  I'm trying to follow Nvidia's guide to compile FFmpeg with nvenc support on Windows and it has a stage to export the path of Visual Studio's 2013 SP2 amd64 compiler to the global path variable of the compilation dev environment :

  


  


  export PATH="/c/Program Files (x86)/Microsoft Visual Studio 12.0/VC/BIN/amd64/" :$PATH

  


  


  They say earlier in the guide that for different versions of Visual Studio different path might be required. I'm trying to use Visual Studio 2022 Community, but don't know where its amd64 compiler directory is.
I also don't know what that VC stands for ("Visual C", maybe, whatever that "Visual" might mean ?).

  


  I found in the installation directory of Visual Studio 2022 a few directories named amd64 but none of them were under one with VC or something similar in its name.
The one I think is the most likely candidate to be the updated compiler is at /MSBuild\Current\Bin\amd64.

  


  If anyone knows, please tell me if if this is the right path, and if not, what is the right path.

  


  Microsoft does offer a version of Visual Studio 2013 Update 2, though (I assume they changed their naming scheme from "service packs" to "updates, which would make it the same software), but it doesn't offer a 64-bit version of it, and I want to compile a 64-bit software - so I assume it doesn't come with one. Please do correct me if I'm wrong, it'd save me needing to use a version of Visual Studio that is different than the one in the guide.