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• How to Fix Problem Drawer Text and Join with FFmpeg

  13 août 2019, par Marcos QP

  I have two short videos with good state (input1.mp4, input2.mp4).
  I use ffmpeg to edit videos.

  Part 1
  I combine two videos, it works correctly

  Part 2
  I draw text on input1.mp4, result output1.mp4, it works correctly.
  I join two videos (output1.mp4, input2.mp4), its join success. But result video is corrupt.

  ------------------------------------------------------------------

  I use these comands ffmpeg

  Combine Videos
  ffmpeg -y -f concat -safe 0 -i list.txt -c copy merged.mp4

  Draw Text on Video
  ffmpeg -y -i input1.mp4 -vf "drawtext=fontfile=/Windows/fonts/arialbd.ttf : text=’Some Text’ : fontcolor=white : fontsize=50 : box=1 : boxcolor=black@0.5 : boxborderw=5 : x=(w-text_w)/2 : y=(h-text_h/2)" -codec:a copy output1.mp4

  ------------------------------------------------------------------
  

  Please i need your help to drawer text and join.
  Sorry my bad english. I am still learning.
  Thanks.

• FFMPEG mux video and audio : mapping problem

  25 septembre 2022, par Donat Van Bellinghen

  I have a video file with no sound : input.mp4 and a sound file : sound.wav

  


  I want combine them in an output.mp4 which would have the video from input.mp4 and the sound from sound.wav.

  


  I'm using the command :

  


  ffmpeg.exe -i input.mp4 -itsoffset 200ms -i sound.wav -map 0:v -map 1:a -c:v copy -c:a aac -b:a 160k -async 1 output.mp4


  


  This is working except that the output.mp4 is longer than the input.mp4, because the sound.wav is longer than input.mp4.

  


  I would like output.mp4 to be the same duration as input.mp4, regardless of the duration of sound.wav (and also regardless of any offset I apply using -itsoffset)

  


  I know there's the "-shortest" option but I can't use that option because my sound file might in some cases be shorter than the video file

  


  Regards

  


• Problem trimming / excerpting MP4 with FFmpeg

  18 novembre 2022, par Spencer Graves

  The video is black in the first almost 2 seconds of an MP4 file created by "ffmpeg -i Sorrell2022-11-16.mp4 -ss 2:46 -to 41:49 -c:v copy Sorrell2022-11-17a.mp4". "input.mp4" [Sorrell2022-11-16.mp4] and "output.mp4" [Sorrell2022-11-17a.mp4] are available in :

  


  https://drive.google.com/drive/folders/1vSRODTQ04XKNr1iDF6bOYwmcuTHxnKGa?usp=sharing

  


  


  1. How can I get ffmpeg to properly perform this trim / excerpt task — without substituting black for the images in the first not quite 2 seconds ?

     


  


  2. What should I do to upgrade ffmpeg to the latest ? My primary computer is running macOS Big Sur 11.7.1. "brew update && brew upgrade ffmpeg" didn't work for me. I've run "brew update" separately, getting now, "Already up-to-date." "brew upgrade ffmpeg" says, "Error : ffmpeg not installed". It's clear that ffmpeg is installed and working, but brew cannot find it. I saw advice to uninstall ffmpeg and reinstall it from scratch. However, I'm reluctant to do that, because I sometimes use "ffmpeg -i input.mp4 -c:v libvpx-vp9 -b:v 2M -pass 1 -an -f null /dev/null" followed by "ffmpeg -i input.mp4 -c:v libvpx-vp9 -b:v 2M -pass 2 -c:a libopus output.webm", and this did NOT work on my Mac until the last time I reformatted my hard drive and reinstalled everything. Maybe I should not worry about this.

     


  


  


  Suggestions ? Thanks, Spencer Graves