AviSynth - The output video aspect ratio doesn't match the original one.

[Osram123]

I have a 720x480(4:3) NTSC video, however, when I encode using AviSynth and MeGUI, the video seems to be slightly stretched horizontally (aspect ratio become 3:2). How can I retain the video's aspect ratio and doesn't being stretched? I'd tried using LanzcosResize() method but it still being stretched, I have some scripts going on before that function, maybe that's why the video have been scaled automatically before even touched by LanzcosResize().

[Shaylen]

720/480 = 3/2 --> 3:2

640/480 = 4/3 --> 4:3

Muxing in mkvtoolnix GUI will allow you to maintain the display aspect ratio [If you want to] otherwise it will give you a 3:2 aspect ratio

[jagabo]

You can resize to the correct aspect ratio in AviSynth or you can have the encoder or muxer specify the correct sample aspect ratio or display aspect ratio within the A/V file so that the player will performs the scaling during playback.

[Osram123]

@Shaylen
@jagabo

Thx! Why I didn't figured out, that's so simple!

[hello_hello]

If you creating scripts using the script creator, you can enable anamorphic encoding to get MeGUI to set the correct aspect ratio, or you can enable resizing and MeGUI will resize to square pixels. If you do the former and switch to the script creator's script tab you'll see the display aspect ratio at the top.

There seems to be a small bug at the moment where if you enable anamorphic encoding, MeGUI might display some odd resizing and an aspect error if there's any cropping. It doesn't matter because for all the anamorphic options resizing is disabled (so it's just misleading) except for the "resize to selected mod" anamorphic option where resizing is enabled, but it works correctly.