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• Creating video out of many video clips

  25 janvier 2017, par user2821420

  I have a series of video clips which need to go at certain times after the beginning of a video. For example, I may have test1.mp4 at 833 milliseconds after a video starts and then test2.mp4 might play 7460 ms after the video starts. The video should show black until 833 ms then after that video ends, test2 should play at 7460 ms. I don’t see an easy way to do this just using ffmpeg, what should I use to do this ?

• how to remove duplicated video frame in ffmpeg ? but have to do not all video but some seconds section.

  18 octobre 2018, par cool jobs

  i have MTS(avchd) 2hrs video , but this video have duplicated frames range of between 00:00:00 ;00 00:00:00 ;20 , some time 3frames , sometime 2frames , sometime 9frames and so on ...
  so i have to do remove duplicated frame for this section .
  even if out of this section duplicated frame then have to keep . should not be removed

• How can I split a series of clips from a video and then stitch them together without audio or video gaps ?

  16 avril 2020, par Dr. Cyber Sec

  I'm developing an application where I take a video and (1) split it up into a bunch of 1 second chunks. Then, I need to (2) stitch a subset of those chunks back together, resulting in a slice of the original video.

  



  For example, let's say I have an original, 10s clip. I split it up into 1s chunks for each second (a clip from 0s to 1s, a clip from 1s to 2s, etc.). I now need to stitch, say, seconds 2-4 together into one video.

  



  I'm currently attempting both steps using ffmpeg.

  



  For clip-cutting :

  



  ffmpeg -ss 33 -i video.ts -t 1 33to34.ts


  



  This should seek to second 33 and output a 1s clip duration, yielding a video clip containing seconds 33-34 of the original video. I noticed that ffmpeg doesn't always seek accurately, so after following the instructions in this post, which says to manually add keyframes to the parts of the video you want to cut, I tried this :

  



  First, setting the keyframes :

  



  ffmpeg -i video.ts -force_key_frames 00:00:01.000,00:00:02.000,00:00:03.000,00:00:04.000 out.ts


  



  And then cutting the clips as I did before with the new output clip.

  



  While this did get the videos to be exactly 1s long each, (which I wanted) there is a small gap (just a slight jitter) in audio when I combine the clips back together. I cannot have this, and am looking for a solution.

  



  Can anyone help me understand why this is happening and help me find a solution ? Thank you so much in advance.