create video from jpeg files...maintain aspect ratio of jpeg

[zuehls]

I am using the following command to create a video of a bunch of jpeg files. The problem is that some of the jpegs are portrait and others are landscape. Ffmpeg is stretching the portrait images. Is it possible to maintain aspect ratio of the jpegs... perhaps put black bars on the portrait images using ffmpeg?

ffmpeg -r .75 -f image2 -i Image%d.jpg output.mp4

[loell]

I think there's a -aspect parameter in ffmpeg.

ie

-aspect 4:3

probably try it.

[zuehls]

I decided to use imagemagick to fix my problem

[no2498]

do not see that helping
all the pics must be in the same mode portrait or landscape
1 of the 2 but not both at the same time

1 is say 640x480 the other is 480x640
wide&fat thin&wide
best way i can say what it is