[plazma]

The keep aspect ratio option converts the video with the desired horizontal resolution and the vertical resolution is calculated so the aspect ratio is correct.

If you convert 4:3 material with the option 400x240 then the final resolution is 400x300. If your player have a 400x240 display then the player have to rescale it.

Is it possible to have the "keep aspect ratio" to keep the final resolution in the limit of 400x240?

Now you have to calculate the optimal horizontal resolution so the vertical resolution is exactly 240 pixels.

If you convert wider than 16:9 videos then it works ok.