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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.

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I'm not sure where you got the -delay option from; in the manpage for avconv I have on my system it isn't mentioned.


avconv -i image%d.png -r 60 ./filename.mpg

as it wasn't the only problem with your command.

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This may be helpful, I hope...

To set the video bitrate of the output file to 64kbit/s:
avconv -i input.avi -b 64k output.avi

To force the frame rate of the output file to 24 fps:
avconv -i input.avi -r 24 output.avi

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
avconv -r 1 -i input.m2v -r 24 output.avi

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