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• Extract Images from video and rebuild video with these images

  6 mars 2015, par David Zenou

  I have a very interesting question i think, i did a simple test.

  First step : I extract images from a little video (duration : 1 minute and 4 seconds) :

  ffmpeg -i C:\test\video.mp4 -r 30 -s 640x360 -f image2 C:\test\foo-%05d.jpeg

  Second step : I want to rebuild the initial video with these extracted images with same parameters :

  ffmpeg -f image2 -i C:\test\foo-%05d.jpeg -r 30 -s 640x360 C:\test\final.mp4

  Special result : Initial video (video.mp4) duration was 1 minute and 4 seconds and new video generated (final.mp4) duration is 1 minute and 17 seconds : the new video is longer and the new film seems slightly slower than the initial video.

  My question : Is it possible to get exactly the same film like initial (same duration, same speed) rebuilding the video from its exctrated images ?

• ffmpeg adds 200 seconds of silence

  1er octobre 2022, par AncientToaster

  I'm using ffmpeg's concat option to combine a series of still images with an mp3 file. The total duration of my input.txt file is 12532 seconds, which is exactly the same as the total duration of my mp3 file (3:28:52, or 12532 seconds).

  


  But ffmpeg is adding 200 seconds of audio-free content to the end of the video. I've tried totaling and re-totaling the total duration of input.txt and it all seems to add up to the same amount. Including or excluding the -shortest flag also doesn't seem to matter.

  


  


  • ffmpeg command :

    


    ffmpeg -f concat -i input.txt -i input.mp3 -shortest -c:v libx264 -r 1 -pix_fmt yuv420p output.mp4


    


  


  • input.txt source

    


  


  • input.mp3

    


  


  • output file

    


  


  


• convert multivideos from 1080p to 720p and add watermarks with subtitles ?

  20 novembre 2020, par shady melad

  0

  


  i will ask again i have many videos like series (dark - la casa de papel - game of thrones ) all of them without any subtitle or watermark first i burn subtitles with handbrake sec i use ffmpeg to burn watermark with videos by this code

  


  for %i in ("C :\Users\shady\Downloads\convert\01*.mp4") do ffmpeg -i "%i" -i C :\Users\fady\Downloads\convert\shady.png -filter_complex "overlay=main_w-overlay_w-10:10" -codec:a copy "C :\Users\shady\Downloads\convert\new01% ni.mp4"

  


  then i convert it to 720p with this code

  


  for %i in (C :\Users\shady\Downloads\convert\01*.mp4) do ffmpeg -i "%i" -c:a copy -s hd720 "C :\Users\shady\Downloads\convert\new01% ni.mp4"

  


  my question now if i want to burn subtitle for series dark all seasons with my watermark and the final file get out with 720p with subtitle with watermark on top at right

  


  can i do that ?

  


  watermark png subtitle srt movies come with mkv not mp4 ( i want the final file come with mp4 )