[BD-RB] Anything to consider when using Decomb as deinterlacer?

[The_Unknown]

Hello,

I shrinked the extras BD of Pirates of the Carribean 3. When I take a look at the result I have interlacing artifacts. This happens even when I play it in PowerDVD 10, which as a playback software should deinterlace.

Should I now activate the "decomb"-filter in the setup?

Thanks!!

Bye The_Unknown

[jdobbs]

Hello,

I shrinked the extras BD of Pirates of the Carribean 3. When I take a look at the result I have interlacing artifacts. This happens even when I play it in PowerDVD 10, which as a playback software should deinterlace.

Should I now activate the "decomb"-filter in the setup?

Thanks!!

Bye The_Unknown If you play it back on a standalone player you wouldn't see any artifacts. But PC's have a tendency to accentuate it. If your goal is to playback on PCs I would recommend you use DECOMB.

[The_Unknown]

OK, and does this setting significantly reduce the image quality?

[jdobbs]

All it does is smooth the jagged edges. Whether that is good or bad for quality is in the eye of the beholder. I personally don't think it hurts quality if you are playing it back on a PC. But, still, I also try to keep as many things identical to the original as I can and I use a standalone player for playback.

[djmasturbeat]

i have a question about this, hopefully you might monitor new responses here-

i rebuilt a BD that the source was VC1 1080i/29.97... the original doesn't show much more than usual interlacing artifacts on an 1080i, on a software player. the rebuilt image was really very bad. I wish i had saved some screens, but, anyhow, i guess i am curious if i should plan to always use Decomb on any 1080i, and if i don't will i experience the serious shredded image effect from x264? seems unlikely, but was some of this due to source being a different (inferior) codec (VC1)?
as you said, i try to do as little tampering with source as possible, but for some reason this re-encoding the 1080i hyper intensified the interlacing well beyond a point that any hardware player could save it :P

as a side note question, i may be re-encoding some 1080i/50 source soon, should i enable other settings for this as well as Decomb ? The output i would like to be more compatible, if possible, with US TVs and hardware BD players.

[jdobbs]

The difference in playback is the fact that the original was VC-1 (which is more common for interlaced sources) and the new encode was AVC. The AVC codecs on a PC seem to be a little inferior for interlaced playback (just my observation, nothing scientific).

I'm not sure all U.S. players have the ability to playback 1080i/50. So there's at least a chance you may run into some issues. It's possible to convert to 23.976fps with a little filter magic if you're doing movie-only, but I think (I can't remember off-hand) that BD-RB may reset the framerate to the original after the filters -- I'll have to take a look.

[djmasturbeat]

okay. thanks for the response :)

as for scientific or not, the difference was unbelievably huge between the source and end-result. i wish it weren't, since i did 2 pass slowest-encode mode for everything (even extras) for a not-quite BD25. i really don't want to redo it, but it really looked like it went thru the chipper :P so i will go with you on it being a codec thing, and maybe microsoft's just handles interlaced better, or w/e. might it be something to think about, offering some freeware VC1 encoder alternative (with provision of suggesting using it only for VC1 1080i sources or something like that? not sure if this would really be worth it, but if you want someone to test a feature such as this, i would be willing to... i have a few 1080i retail discs to test with: some anime, some live action, some documentaries, a good variety of things, really). I normally wouldn't even think about encoding with other than x264, but if the results for interlaced sources would be vastly improved i would use it.


if you think of a way to use the ini file to over-ride the return to original framerate (in my case for the 1080i50, to try to keep at 23.976), i would appreciate it.

[setarip_old]

@djmasturbeat

Hi!

Try each of the three VC-1 settings choices under ffdshow...

[djmasturbeat]

@setarip_old or jdobbs or anyone else-

is there a way to set up VC-1 to be used as the encoder inside of BD-RB?
is there a way to have it linked from the tools folder, and some setting in the INI so that i may switch the 3 settings from ffdshow?

mostly i do BD25s, with menu and extras, so i would prefer to not have to demux each m2ts & reencode each video then remux, then hope the total size is not off after all the reencoding time. I would prefer to streamline this into BD-RB for the times I need to try to work on these VC1 1080i BDs (anime and documentaries seem to be the usual culprits for this).

[jdobbs]

1. There is no free VC-1 encoder of which I'm aware -- and if there was it wouldn't be as good as X264.

2. Switch the 3 settings for what? And why?

Honestly your post isn't making any sense to me. As for "hoping the size isn't off" -- if you are correctly configured it is always exact.