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• ffpmeg extracting frames produces too many images

  7 septembre 2019, par Abishur

  I’m using FFMpeg to extract some png files from a video using the following command :

  ffmpeg -i FILE.mp4 -vf "select=not(mod(n\,75))" -vsync vfr img_%03d.png 

  the source video has a duration of 2898 seconds and a framerate of 25 FPS. This means I should be grabbing a picture every 3 seconds for 966 pictures.

  However, instead I’m getting 1158 pictures. After doing some math I’ve discovered that that is the within 2 pictures of what I would expect if I was grabbing the 75th frame from a 30 FPS video.

  I’ve tried -framerate=25 but it still produces the same amount of pictures. The video does have a variable framerate, however using ffprobe it says that the max FPS is 25.47. So even if it was at the max FPS the whole video then I’d still only expect to see 984 pictures.

  Is there anyway to tell FFMpeg that my source video is only 25 fps ? Or am I missing something obvious ?

• Can't get FFMPEG to convert Samsung Motion Photos from .jpg to .mp4 [closed]

  27 août 2024, par welbeebee

  I pulled a bunch of Samsung Galaxy S21 Ultra motion photos to my PC (Windows 11) for video editing, but they were in .jpg, and for some reason Microsoft Clipchamp couldn't convert them to video. But, I knew the motion photos were intact, bc Microsoft Photos was showing the MOTION option and playing the videos just fine.
So, I'm in FFMPEG just throwing everything at the wall, but can only get still MP4's out of it, with none of the video.

  


  Here's the breakdown of what I'm looking at for :
ffmpeg -i input.jpg

  


  Input #0, image2, from '20240623_233601.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 874324 kb/s
  Stream #0:0: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 2944x2208 [SAR 59:59 DAR 4:3], 25 fps, 25 tbr, 25 tbn


  


  So to get the whole folder converted, I'm trying :
for %i in (*.jpg) do ffmpeg -i "%i" -c:v libx264 -map 0:0 -preset veryslow -crf 18 "%~ni.mp4"

  


  But this just results in a bunch of those still MP4's I mentioned.

  


  I'm assuming the problem starts with that odd duration of 00:00:00.04, with a bitrate of 874324 kb/s, but I'm not sure. I don't understand this mjpeg video format very well at all.

  


  I been trying to work through this with copilot to no success, and so I'm turning to stackoverflow in case anyone can help me out.
Or am I going about this all the wrong way ? Let me know.

  


• mp4 video loading forever and does not open of Samsung TV

  16 août 2020, par Amira Elsayed Ismail

  I have two mp4 files one is working on Samsung TV and the second one is not working, it keep loading forever

  


  I have checked the codec of both and the are the same , the only change is the bitrate is different, could that be the reason of not being able to play the video on TV

  


  and if yes how to solve t using vlc program or any ffmpeg code that convert it