The VideoLAN Forums

I receive a http video stream with 720x576 resolution.
If I stream this into a file using the scale option, I get results I don't understand.

record options
vcodec = h264
acodec = mp3
mux = mkv

example 1
scale: 0,30
orig: 720x576
file: 224x180 (->0,3111)
-> scale is 0,3111 not 0.3?

example 2
scale: 0,40
orig: 720x576
file: 288x230 (->0,4)
-> scale is 0.4, this is correct!

example 3
scale: 0,45
orig: 720x576
vlc file: 320x256 (->0,4444)
-> scale = 0.4444, not 0.45?

example 4
scale: 0,50
orig: 720x576
file: 368x294 (->0,5111)
-> scale = 0.5111, not 0.5?

How can I calculate the expected pixels?

Thx for help!
DsChAeK

The video codecs probably pads the resolution to the nearest multiple of its macroblock size (I guess 16x16 pixels).

Thx for your quick answer. Well, if I force the width (to my calced scale) there should be no problem with the codecs, it's just how scaling works, right?