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• How can i insert 10 seconds of silent audio(null audio without images or video or black video) into video repeat every 15 seconds with ffmpeg ?

  1er septembre 2018, par Adam Estel

  I have a clip video.mp4 . How can i insert 10 seconds of only silent audio into this clip repeat every 15 seconds until the end of this clip with ffmpeg ?
  I know anullsrc is an audio so i can’t use overlay filter. I research on google for a while but the only option i have is gte(mod(t,15),10)).

  Thank you.

• Video is concatenated but not showing all video after playing First one in ffmpeg

  1er décembre 2017, par Chinmoy

  I am trying to concate three mp4 video using FFMPEG. after executing the ffmpeg commend, when I try to play the final video the one is playing 45 second perfectly and then then make it conflict and stop the video but audio is playing .
  I have check finale video duration It’s duration is 120 second which is total duration of thee input video.
  I am asking to you guys hwo can i play this video with out conflicting.

  Here is my code that I have used for concatenate :

  ffmpeg -i /Users/mukul/Documents/Nugruv/video/testforplay.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts /Users/mukul/Documents/Nugruv/video/testforplay.ts
  
  
  
  ffmpeg -i /Users/mukul/Documents/Nugruv/video/video3.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts /Users/mukul/Documents/Nugruv/video/video3.ts
  
  
  
  ffmpeg -i /Users/mukul/Documents/Nugruv/video/video4.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts /Users/mukul/Documents/Nugruv/video/video4.ts
  
  
  
  ffmpeg -i "concat:/Users/mukul/Documents/Nugruv/video/testforplay.ts|/Users/mukul/Documents/Nugruv/video/video3.ts|/Users/mukul/Documents/Nugruv/video/video4.ts" -c 

  copy -bsf:a aac_adtstoasc /Users/mukul/Documents/Nugruv/video/Cam01.mp4
  I am waiting for your help.. :)

• Create video with correct FPS from video with incorrect FPS and file containing timestamps for each frame using FFMPEG

  4 février 2023, par Bojan

  I have a video file captured from web camera and using OpenCV in python. The nominal FPS of the web cam is 30 FPS, but because of the environment, the actual FPS varies and sometimes can go as low as 24 fps. The recorded video is created using OpenCV's VideoWriter, using MP4V FOURCC and always has FPS value of 30, which makes the video's duration incorrect if the actual FPS was not 30. I have a file which contains the timestamps when each frame from the web cam was read (generated using python's time.time()).

  


  Question :
  
Using FFMPEG (or other software) can I use the timestamps information to create new video file (probably VFR file) and then convert it to CFR file ?

  


  I am not sure what is the correct approach to create video file with correct time base.
Maybe I can split the video's frames and save them as images and then use the timestamps and the images to create VFR video, but I want to see if it is possible to do this in another, more elegant way.

  


  Thanks in advance !