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• How do I make a C# win form program that breaks a video down to frames, then put those frames back together to make a video ?

  30 juillet 2015, par Atom Scott

  First, I’m fairly new to C sharp so I’m looking for a thorough and easy to understand answer.

  How do I make a C# win form program that breaks a video down to frames, then puts those frames back together to make a video ?
  I also want to be able to select which frames to extract by setting an interval time. For example, extract frames that are one second apart.
  Is this possible, I have done some research but I don’t understand how to use the codes displayed on the following websites.

  Supposedly code to breakdown video into frames. However I do not know where to put it. Do I make it the event for a button or something. From my own research I am guessing this uses ffmpeg. But I’m not exactly sure how to use ffmpeg, I have tried downloading Aforge, and use Aforge.Video.ffmpeg. But I’m stuck there.
  http://www.researchgate.net/post/Has_anyone_code_in_C_to_read_video_file_and_split_it_into_frames[^]

  Code for making a video from images, it looked promising so i tried to copy and paste it visual studio. However the line using BytescoutImageToVideoLib ; has an error asking me whether I am missing a reference. What reference am I missing ?
  http://bytescout.com/products/developer/imagetovideosdk/imagetovideosdk_first_step_with_visual_c_sharp_net.html[^]

  I also noticed that there was a page on code project for something similar to this, but the downloadable demo project didn’t work at all. I didnt see the point in spending time on something where the end product is broken.
  http://www.codeproject.com/Articles/13237/Extract-Frames-from-Video-Files

  Any help is greatly appreciated.

• avcodec/libx264 : leave full range flag unchanged if unknown

  17 août 2021, par Jan Ekström

  avcodec/libx264 : leave full range flag unchanged if unknown
  By default the x264 full range flag is set to -1. By not setting
  
  it to something else, we can let libx264 handle the RGB case.
  
  Additionally, change the preference order to user-specified range
  
  first, and then any fall-back logic left for the YUVJ pix_fmts.
  Fixes the capture part of #9374
  

  • [DH] libavcodec/libx264.c

• Revision 0a2b25dcb9 : configure : add —enable-coefficient-range-checking This commit adds a configure

  29 juillet 2014, par Yaowu Xu

  Changed Paths :
   Modify /configure

  
   Modify /vp9/common/vp9_idct.h

  
  
  configure : add —enable-coefficient-range-checking

  This commit adds a configure time option used to enable strict error
  checking in decoder to make sure intermediate stage cofficients of
  inverse transforms are within valid range of signed 16 bit integer.

  For valid VP9 input streams, intermediate stage coefficients should
  always stay within the range of a signed 16 bit integer. Coefficients
  can go out of this range for invalid/corrupt VP9 streams. However,
  strictly checking this range for every intermediate coefficient can
  be a burden for decoder, therefore such validation is only enabled
  with configure option —enable-coefficient-range-checking.

  Change-Id : I47d47c8c4e48a922c3d223ca59064f51b3f0f5ed