XviD decoder bug

[Xpenguin17]

Why does my XviD decoder output the 2-pixel tinted vertical lines all the way to the right? I was doing an x264 comparison to see how much a Starcraft video benefits and how many times more bitrate XviD requires for the same SSIM, but I noticed that increasing it immensely only increased SSIM by a margin for some reason. I was ready to proclaim that XviD simply sucks a chronically unwashed **** but then I noticed those 2 vertical lines, present in every bitrate, which explains what kept hogging the metric.

I'm using K-Lite Codec pack like the lazy ****** I am, so I can't really pinpoint to the problem. Can it be the XviD settings by any chance? I have them all cranked to maximum, so maybe I need to uncheck something, say Trellis?

[poisondeathray]

Are you saying those dark right edge pixels aren't there in the x264 version?

How are you viewing this, and taking screenshots?

If you are using a directshow method, try opening in vdub directly (using vfw) => does the dark line still occur?

What if you open it up in avidemux (completely different decoder)?

If it's present in all decoders, something might be up with the way you encoded it.

Maybe describe your workflow in more detail...

And who plays starcraft anymore... :P

[jagabo]

The image you posted was 640x480. But artifacts like that often arise from non mod16 frame sizes and different encoders and decoders. A 638x480, or 642x480 frame, for example.

[Xpenguin17]

Are you saying those dark right edge pixels aren't there in the x264 version?

Not in the x264 encode, not in the original.

How are you viewing this, and taking screenshots?

Virtualdub.

If you are using a directshow method, try opening in vdub directly (using vfw) => does the dark line still occur?

Take a guess.

What if you open it up in avidemux (completely different decoder)?

Same thing.

If it's present in all decoders, something might be up with the way you encoded it.

That's what I thought. Should I just download the latest XviD codec directly?

Maybe describe your workflow in more detail...

I open the raw footage (640x480) with Vdub, select XviD and do a 2-pass encode, using maximum settings for best quality. The vertical tint occurs in all videos of all resolutions, at least that I've tested.

And who plays starcraft anymore...

**** off, SC even after 10 years remains the most popular game online, and is one of the few places on the internet where the mass population has a low prevalence of retards, unlike WoW or Diablo. Then again I haven't played for a year 'cuz I've been rattling really bad so who knows what 2009 brought in my absence.

@Jagabo, the original video is 640x480. No non-standard bullshit here.

[jagabo]

Should I just download the latest XviD codec directly?

Yes. I use Xvid all the time and never have that problem at the edge of the frame.

[Xpenguin17]

I've tried configuring ffdshow to decode with 'XviD' instead of 'libavcodec' and nothing improved.

[jagabo]

Maybe its happening while encoding, not decoding. Upload a short sample Xvid AVI.

[Xpenguin17]

K.

1.avi

[poisondeathray]

Can you upload a short sample of the source?

[jagabo]

K.

1.avi

Yes, the dark pixels are encoded into the file. You have an encoding (or earlier) problem, not a decoding problem.

[Xpenguin17]

I tried encoding with my new setup too, same thing.

source.avi

[jagabo]

No problem here. Converted to Xvid with VirtualDub:

xvid.avi

[poisondeathray]

Works fine here too.

Since encoding using x264 works ok, it's probably a xvidvfw encoding issue

Try resetting the default xvid encoding settings, or maybe re-install it

What happens if you use xvid_encraw (e.g. though megui)?

[Xpenguin17]

Aight people, problem's remedied. It wasn't xvidcore but xvidvfw which was the problem. It was outdated plus I was using an older, experimental version of Virtualdub which probably interacted wrong with xvidvfw.

Just for reference, default settings didn't work in Vdub and xvid_encraw worked fine.

[Xpenguin17]

And in case any of you are curious, here are some screenshots:

Worst XviD frame.
Same frame from x264 video.
Original.

It took XviD 5.2x the bitrate to match x264. ******* beautiful. Too bad I never watch game replays.