Nero Recode 2.2.6.16 : Output Resolution Problem

[3ngel]

Hi, i have a 1024 * 424 @ 25fps progressive, i try to encode with "Maximum Definition Profile", "Disable Deinterlace", "Disable Crop", "Disable Resize". But the resulting .mp4 file is 1024 * 416. Why??
Thank you.

[Koti]

Recode requires WxH mod16 if I recall correctly.
424 isn't /16 so recode moves to the nearest size that is.

[3ngel]

Oh, i see :(. It's the same even in AVC Profile?
It's kind of big limitation, for a good codec like this! :mad:
It will be corrected in the future?

[akupenguin]

All block-based codecs since forever have had the mod16 restriction. The only difference is that some encoders hide it by rounding up instead of down, and then cropping during playback. (Which silently decreases quality, since it's hard to guess stuff to put in the margins that doesn't interfere with compression.) Of course, that's possible in H.264 too, don't ask me why Recode doesn't do so.

[3ngel]

@akupenguin
So you're saying that every codec, in coding for example a 424 height, round it up to 432 and then in playing stage crop up and down? Wow, i didn't know that, thanks. So why Nero doesn't do so? :D

[akupenguin]

I'm not saying such rounding is a good thing, only that any MPEG-like codec that accepts non-mod16 resolutions does so. In my tests, scaling to the next multiple of 16 (and setting anamorphic display) produced slightly better quality than padding and cropping.

Anyway, you've told Recode not to crop and not to resize, but given it a video that requires one or the other. I don't know which it chose, but I think they figured a little DWIMmery was better than rejecting the encode.

[3ngel]

@akupenguin
I didn't want to critice you, really i don't know this matter of mod16. BTW personally i think that pad and crop (at least from an uncompressed point of view) is obviusly better than resize, cause of resizing alters the quality of the source. And now that i know this mod16 fact, i ask again, why nero doesn't pad and crop? I want obviously the same WH and not a modified one. Nero develoooopeeeers??? :D