FFMPEG : custom sequence input images

Question

I created a video from a set of images.

The command look like:

ffmpeg -i bg.jpeg -i img_%d.png -filter_complex overlay=5:H-h-5[b]-shortest testvid.mp         


        

Answer 1

I just had the same issue, and if you have the need to generate image list as a part of program execution, then consider adding a duration string after every file line, which will make the filter infer DTS. Like below:

file 'img.00000020.png'
duration 0.03333
file 'img.00000021.png'
duration 0.03333
...

For the case of offline conversion of a bunch of images, inline globbing worked just fine (so yes - DTS errors come from concat filter), but the following bash command can provide a list for the dry run:

for i in img.*.png; do echo file \'$i\'; echo duration 0.03333; done > list.txt