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• Ffmpeg : Move a slider "image" over a "background" from 0% to 100% in sync with the audio

  7 février 2014, par Znuff

  I'm trying to create a video using the follwing code :

  `$`ffmpeg -loop 1 -r 5 -i video.png -r 5 -i progress.png -filter_complex "overlay=x='if(gte(t,0), -W+(t)*5, NAN)':y=H-h" -i video.mp3 -acodec copy video.mp4

  I have the following files

  • video.png
    • this is a 1280x720 px still frame that is simply a background with a waveform of the video.mp3 file
  • progress.png
    • this is simply a 1280x100 px semi-transparent image that should simulate an animation (from from 0 to 100% of the width of the video.png file, in order to simulate "fill up" animation.

  My issues are as following :

  • The video is not in sync with the audio. The progress bar is way off, instead of finishing at the end of the song, it just keeps going on and on and on and on...
  • Also... it just keeps going on and on ! I left it create a 1 hour video and it never stopped.

  I know I'm missing something in the filter, but I have no idea how I could fix it.

  Could someone lend me some help ?

• doc/examples : Always open files as "binary", not "text".

  25 juin 2020, par Carl Eugen Hoyos

  doc/examples : Always open files as "binary", not "text".
  Fixes ticket #8638.
  

  • [DH] doc/examples/decode_video.c
  • [DH] doc/examples/hw_decode.c

• Need help to convert all "mp4" files to "gif" in a folder/directry with ffmpeg and .bat

  10 février 2023, par Lucas Yang

  I need some help.I try work automation to eliminate unnecessary time, I was looking for a way to convert video files to gif files.
So I learned how to make it using ".bat" through Googling, and want to make it a ".bat file" that automatically converts all mp4 files at one click because only one file is converted at a time.

  


  it worked perfect for me. but I got a lot of vidoe files what i have to convert. I installed ffmpeg in my PC(@window)

  


  this is what i find

  


  @echo off
chcp 65001
cls

setlocal
echo 프레임 수치를 설정하세요
set /p fps= 

ffmpeg.exe  -i "%~1" -vf "fps=%fps%,scale=860:-1:flags=lanczos,palettegen" "%~n1.png"
ffmpeg.exe  -i "%~1" -i "%~n1.png" -lavfi "fps=%fps%,scale=860:-1:flags=lanczos [x]; [x][1:v] paletteuse" "%~n1.gif"

del "%~n1.png"

goto :a


  


  Thank for reading it.