So far, I'm doing something like this
avconv -i "image%d.png" -f image2 - delay 100 -s:v 1280x720 ./filename.mpg
but the delay does not seem to change anything.
I'm not sure where you got the
as it wasn't the only problem with your command.
This may be helpful, I hope...
To force the frame rate of the output file to 24 fps:
To force the frame rate of the input file (valid for raw formats only) to 1 fps and the frame rate of the output file to 24 fps