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• how to change the fps of video during playback of video without restarting video

  8 juin 2018, par Mahek Delawala

  I want to change the fps of video at run time (during the playback of video) without restarting or pausing using ffmpeg. I searched about it in the internet but I am not able to get the command which can change the fps directly without restarting the video but i found ffmpeg command which can create a new file with modified fps as shown below.
  ffmpeg -y -r 20 -i input_file -r 45 output_file
  Is it possible to change fps of video during run time using ffmpeg command ? If yes please provide me the command if not how can i change using c code. Please help me in this issue as early as possible.
  Thank you.

• I want my video to crop 720x480 2s then serial crop 5s 1280x720 and so on until the end of the video. The output is a single video. ffmpeg [closed]

  5 décembre 2019, par SON PHAN VAN

  My input is a 1920x1080 video. I want my video to crop 720x480 2s then serial crop 5s 1280x720 and so on until the end of the video. The output is a single video. What should I do with the ffmpeg command.

• FFMPEG - Merge multiple video in to one video, the output video has no audio

  26 octobre 2018, par Tan Pham

  My input file has 5 video and 1 picture. I want to merge all video to one video, play video at the same time.
  The layout of the output video like this :
  

  Im using ffmpeg to merge video. this is my ffmpeg command :

  ffmpeg 
  
  -i C:\VID\test1.mp4 
  
  -i C:\VID\test2.mp4 
  
  -i C:\VID\test3.mp4 
  
  -i C:\VID\test4.mp4 
  
  -i C:\VID\test5.mp4 
  
  -i C:\VID\background.jpg 
  
  -filter_complex 
  
  " nullsrc=size=1280x720 [base]; 
  
  [0] setpts=PTS-STARTPTS, scale=560x360 [video0];
  
   [1] setpts=PTS-STARTPTS, scale=280x180 [video1]; 
  
  [2] setpts=PTS-STARTPTS, scale=280x180 [video2];
  
   [3] setpts=PTS-STARTPTS, scale=280x180 [video3];
  
   [4] setpts=PTS-STARTPTS, scale=280x180 [video4]; 
  
  [5:v] scale=700x700 [image]; 
  
  [base][video0] overlay=shortest=1 [tmp1]; 
  
  [tmp1][video1] overlay=shortest=1:y=360 [tmp2];
  
   [tmp2][video2] overlay=shortest=1:x=280:y=360 [tmp3]; 
  
  [tmp3][video3] overlay=shortest=1:y=540 [tmp4]; 
  
  [tmp4][video4] overlay=shortest=1:x=280:y=540 [tmp5];
  
   [tmp5][image] overlay=570:10:enable='between(t,0,30)'"
  
   -t 30 -c:v libx264 output.mkv

  The output video layout is working fine but no audio in the output video.
  I want all audio off each video will be keep on the output video. play audio at the same time together.
  I’m using tutorial on this link : Create a mosaic out of several input videos
  Thanks for reading