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• FFMPEG concat video finished but the video missing

  27 avril 2017, par Thien Hoang

  I was concatenated video with FFMPEG. Here is code :
  ffmpeg -i "concat:video1.webm|video2.webm|video3.webm|video4.webm" -c copy output_video.webm

  After concatenate finished, I play the video but the video display only video1. It missing the video2, video3, video4. Although, The output_video.webm is full size. I don’t know why ? Please help me, How to fix it ?

  Thank you so much,
  Bien

• How to convert a CCTV footage into time lapse video by cutting parts of the video by a set interval on FFMPEG [duplicate]

  2 décembre 2020, par mark

  I have bunch of CCTV footages and I want it to look like it was recorded from a time lapse camera. One video file is around 3 hours long capturing scenes in real time (from 1pm-3pm for example). And in one day, I'll get around 8 footages (8files * 3hours = 24hours = 1 day)

  


  I want to convert those 24hours worth of footages to 1min making 1 day = 1min of video not just making it fast but actually cutting some of the scenes by a set interval. Usually, a time lapse camera has an interval of one photo per 10 min and at the end of the day, it will stitch them into one video. How can I do something like that on FFMPEG ?

  


  I'm using FFmpeg Batch converter and here's my code so far. It just makes my videos faster but not cutting it into itervals

  


  -filter:v "setpts=0.25*PTS" -an


  


  I ended up with this code :

  


  -vf framestep=25,select='not(mod(n,1000))',setpts=N/FRAME_RATE/TB -an


  


  The above code will make a 1hr long video into 4sec which is perfect for my needs.

  


• How to create a video of a precise duration from a single image or by trimming a video using FFmpeg ? [closed]

  29 mai 2024, par aas

  I'm trying to create a video from a single image with a very specific duration of 0.09375 seconds using FFmpeg. I've tried various commands, but I can't seem to get the exact duration I need. The closest I've gotten is 0.080000 seconds. It doesn't always have to be something like 0.09375, but I wanted to have an example for it.

  


  I've also tried trimming a video, but from what I've read so far, the encoding of the video can be a problem. Even after trying different FFmpeg commands or using MoviePy directly, I've never arrived at the desired result.

  


  Here are the steps I've taken so far :

  


  Initial Attempt :

  


  ffmpeg -loop 1 -i frame_00001.png -c:v libx264 -t 0.09375 -r 240 -pix_fmt yuv420p -vf scale=1920:1080 output.mp4


  


  Resulting duration : 0.080000 seconds

  


  Adjusted Frame Rate :

  


  ffmpeg -y -loop 1 -i frame_00001.png -c:v libx264 -t 0.09375 -r 160 -pix_fmt yuv420p -vf scale=1920:1080 output.mp4


  


  Resulting duration : 0.081250 seconds

  


  I've also tried using the setpts filter, but I didn't get anything satisfying.

  


  Creating a video from a single image or trimming an existing video were my two ideas, but if anyone has another method to create a video with such a precise duration, I'm all ears !

  


  Any guidance or suggestions would be greatly appreciated.