[FFmpeg-user] Slide show with vfr

[pdr0]

Wolfgang Hugemann wrote
> I did one step backward and tried to construct a vfr video from the
> scratch using slides a an input:
> 
> ffmpeg -y -f concat -i input.txt colors.mkv
> 
> with input.txt as:
> 
> ffconcat version 1.0
> file 'red.png'
> duration 250ms
> file 'yellow.png'
> duration 500ms
> file 'green.png'
> duration 500ms
> file 'cyan.png'
> duration 250ms
> file 'blue.png'
> duration 500ms
> file 'black.png'
> duration 500ms
> 
> This resulted in cfr for mp4 an vfr for mkv or webm (according to
> MediaInfo, a Windows application). However, there seems to be something
> wrong with the result colors.mkv, as no player, including ffplay uses
> the specified durations.

Express duration in seconds

Repeat the last image as per 
https://trac.ffmpeg.org/wiki/Slideshow#Concatdemuxer

file 'red.png'
duration 0.25
file 'yellow.png'
duration 0.5
file 'green.png'
duration 0.5
file 'cyan.png'
duration 0.25
file 'blue.png'
duration 0.5
file 'black.png'
duration 0.5 
file 'black.png'





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