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• Replace video with jpg in ffmpeg

  14 septembre 2020, par ben158

  I am trying to convert an mkv with video and audio into an m4v with the same audio, but with the video replaced with a still jpg for the duration. I'm following the examples from https://trac.ffmpeg.org/wiki/Slideshow and not having any success. Every time I attempt any of these, it doesn't insert the jpg, and instead uses the original video from the mkv. I am testing the files in VLC. Any ideas what could be going wrong ? I'm inclined to think the documentation itself may be outdated or wrong.

  


  Attempts following the linked examples :

  


  -i input.mkv -loop 1 -i image.jpg -c:a ac3 -b:a 640K -c:v libx264 -shortest output.m4v

-i input.mkv -framerate 1 -i image.jpg -c:a ac3 -b:a 640K -c:v libx264 -r 30 -pix_fmt yuv420p output.m4v

-i input.mkv -framerate 1 -i image.jpg -c:a ac3 -b:a 640K -c:v libx264 -r 30 -vf format=yuv420p output.m4v


  


  The one thing I got semi-working (based on code from another source) was -i input.mkv -i image.jpg -filter_complex "[1][0]scale2ref[i][v];[v][i]overlay" -c:a ac3 -b:a 640K -c:v libx264 output.m4v but this stretches the image out (which I don't want, I want the resultant video to have the same aspect ratio as the image without black padding on the sides).

  


  I'm kicking myself because I eventually got something along the lines of the first examples working a few days ago, but somehow didn't save my work and am back to square one. Any help is appreciated, thanks in advance.

  


• Révision 17407 : on avance sur le dateur :

  14 mars 2011, par b b

  * formatage + texte_script sur les chaines de langue et pas de ucfirst * ajout de quelques chaines de langue pour les abbreviations de mois cf http://fr.wikipedia.org/wiki/Mois

• FFMPEG Concat Dropping Frames

  16 mars 2015, par scientiffic

  I’m using FFMPEG to do the following two things :

  • create an mp4 given a set of images
  • compile mp4s to create a longer video (mp4)

  To create mp4s from images, I use the following command :

  ffmpeg -r 5 -i 'img%03d.jpg' output.mp4

  As far as I know, this creates a video with a framerate of 5fps.

  But when I try to compile mp4s, it seems like frames within each mp4 are being dropped.

  To create the compiled footage, I create a text file that points to all the mp4s that should be included in the compilation, e.g.

  file 'set1/output.mp4'
  
  file 'set2/output.mp4'
  
  file 'set3/output.mp4'
  
  file 'set4/output.mp4'
  
  file 'set5/output.mp4'
  
  file 'set6/output.mp4'
  
  file 'set7/output.mp4'

  Then I run the following command :

  ffmpeg -f concat -i input.txt -codec copy compilation.mp4

  The resulting video seems to drop 2-3 frames from each of the output videos.

  How do I ensure that the compiled video doesn’t drop any frames ?

  (For reference, I used the following tutorial : https://trac.ffmpeg.org/wiki/Concatenate)