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• Revision cdc954fdc8 : skip the un-necessary motion search in the first pass This patch allows the VP9

  16 juin 2014, par Pengchong Jin

  Changed Paths :
   Modify /vp9/encoder/vp9_firstpass.c

  
  
  skip the un-necessary motion search in the first pass

  This patch allows the VP9 encoder to skip the un-necessary
  motion search in the first pass. It computes the motion error
  of 0,0 motion using the last source frame as the reference,
  and skips the further motion search if this error is small.

  Borg test shows overall the patch gives PSNR gain (derf -0.001%,
  yt 0.341%, hd 0.282%). Individual clips may have PSNR gain or
  loss. The best PSNR performance is 7.347% and the worst is -0.662%.
  The first pass encoding speedup for slideshow clips is over 30%.

  Change-Id : I4cac4dbd911f277ee858e161f3ca652c771344fe

• Create a slide show from images in a folder [on hold]

  26 juillet 2017, par randommman

  So i have a folder with images like so :

  1.png
  
  2.png
  
  3.png
  
  .. etc

  I am trying to generate a slideshow video from the videos, i have the following code :

          string ffmpegPath = "ffmpeg.exe";
  
          string ffmpegParams = "-y - r " + mimtime + " -i " + Images + "- c:v libx264 -r 15 - pix_fmt yuv420p -vf fps = 90 " + Video;
  
  
  
          Process ffmpeg = new Process();
  
          ffmpeg.StartInfo.FileName = "cmd.exe";
  
          ffmpeg.StartInfo.Arguments = "/k " + ffmpegPath + " " + ffmpegParams;
  
          ffmpeg.Start();

  But this is giving me permision denied, because I think I need to add the individual images. How can I get the individuall images to generate a video ?

• Use FFMPEG to combine different MP4s with srt into one file

  17 juin 2021, par anonymous1a

  So...probably a very basic question for those of you familiar with FFMPEG (I'm really not). I know that you can combine multiple videos into one using FFMPEG, but what about if each video has its own srt file, saved separately in a 'subs' folder and NOT included in the video itself ?

  



  Is it possible for FFMPEG to also combine the srt files into a single one (and recalculate the timestamps), and then merge this into the final, combined video ? If so, what would the command be ?

  



  For example, I have video1.mp4 and video2.mp4. They have corresponding sub1.srt and sub2.srt. When video1.mp4 and video2.mp4 are merged, the timestamps for sub2.srt will, of course, be out of sync now and need to be corrected by adding the duration of video1.mp4 to the individual timestamps (i.e., if video1 is 30 seconds long, and the first subtitle in sub2.srt appears at the 2-second mark, then after the combination, it should now appear at the (30+2)=32-second mark, and so on.

  



  If it helps, all the files are mp4, and have the same dimensions (720p).