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• convert a 10fps video into a one frame per second video with half resolution ffmpeg ?

  22 septembre 2022, par yeahman

  I want to convert my video (h264) into a video with half the resolution of the original video and with one frame per second ; this will be used a small size preview video

  


• write_gif is automatically changing the resolution of the resultant gif as compared to the supplied video(mp4) file ? How to avoid that ?

  14 septembre 2022, par Mohammed Hussain

  Please see the code below and the result. How can we get the gif in the original dimensions. The moviepy documentation doesn't seem to say much.

  


  from moviepy.editor import *  import os  os.chdir(r'G:\')  clip = VideoFileClip("VID.mp4").subclip(6*60, 6.1*60) clip.write_gif("vidgif.gif",program = 'ffmpeg')

  


  

  


• When ffmpeg transcodes, How to use expr to determine video resolution auto set -b:v suitable bit rate

  2 septembre 2022, par SevenFantastic

  I tried to use this code, but ffmpeg doesn't recognize this way of writing

  


  ffmpeg -i .\test.MP4 -b:v "expr: if(gte(iw,800), 2000K, 1000K)"  -f mp4 -y output.mp4


  


  even replace the iw to const 1000, it doesn`t work.

  


  ffmpeg -i .\test.MP4 -b:v "expr: if(gte(1000,800), 2000K, 1000K)"  -f mp4 -y output.mp4


  


  But this way of writing it works fine I'm baffled

  


  ffmpeg -i .\test.MP4 -force_key_frames "expr: gte(t,n_forced * 15)" -f mp4 -y output.mp4