1920x1080 w/low bitrate matrix or 1280x720 w/high bitrate matrix?

[Chainmax]

If you were going to make high resolution Xvid backups of your HDTV captures, would you rather use full resolution with a matrix like HVS_Best or 720p resolution with a matrix like SixofNine?

[ChronoCross]

max resolution. because if later I decide to make it smaller resolution I can always reduce it again but I can't do the vice versa if I encode at 720p. upsizing never gives it the full bling.

[BigDid]

If you were going to make high resolution Xvid backups of your HDTV captures, would you rather use full resolution with a matrix like HVS_Best or 720p resolution with a matrix like SixofNine?
Hi,

There was a similar discussion a while back somewhere in the xvid section. The conclusion was at full resolution even the Eqm V3 ULR from Sharktooth was doing a great job. Since then, however, the author is less satisfied when viewed on the new big LCDs: too much contrast gives ugly results see his post and after: http://forum.doom9.org/showthread.php?p=889258#post889258
+- related: http://forum.doom9.org/showthread.php?p=950694#post950694

Did

[*.mp4 guy]

You should encode it at The same quality that looks good to you when encoding SD, that way when better monitors become widely available your encode will still look good. Most of the time 1080P content doesn't use the full resolution very well, so its safe to downsize, but there are exceptions that you have to look out for.

[ToS_Maverick]

i'm backing up hd-captures for some time now. usually use this settings:

MPEG Matrix
Quants restricted to 3-5 (I 3-4)
MSP 6
VHQ 1

i do a comp check with
selectrangeevery(1200,12)

if CQ 4 @ 1080p hits my target bitrate, i'll use 1080p otherwise
=> 1536x864 for 16:9 or 1536x640 for 2.4:1 if that is still too big
=> 1280x720 or 1280x544

[Sharro]

My 5 cents:

I would have a look at the xvid presets thread, it will certainly help you backing up your decisions.

All the best,

Sharro

[Chainmax]

Some more data: the 1920x1080 version would have a b/p*f of about 0.127 and the 1280x720 version would have a b/p*f of about 0.285; the amount of motion in the material is about the same as a common sitcom, with a few high action scenes.

Both cases would be processed with SeeSaw right after IVTCing and then with LimitedSharpenFaster (placed after resizing in the lower res scenario). The higher res scenario would probably also have some slight denoising to help compressibility.

BigDid, Sharro: I'll check your suggestions, thanks for the info :).

[BigDid]

Yo Chainmax,

Did you got some time to test and decide between full res/low Cqm and Lower res/High Cqm ? :)

Did

[Chainmax]

Not yet, unfortunately. The main problem is finding untouched TS clips to tinker with as we don't have HD signals here in Uruguay.

[Sefyu]

You can find raw HD .yuv files here to experiment with:

ftp://ftp.ldv.e-technik.tu-muenchen.de/dist/test_sequences/

[Sefyu]

Nobody appreciates my source?

[Tagert]

Thank you for supplying some HD test files Sefyu :)

[Sefyu]

Your welcome:rolleyes:

Btw, how can you encode yuv files?
I'm a beginner with enconding and I want to experiment with different codecs and settings to see what they do.

[foxyshadis]

Technically, that is a pretty well known source for HD, it's been posted a few times before.

If you want to use them, you need avisynth (using rawsource) or the tool yuv2avi somewhere on the net.

[Sefyu]

I'm not familiar with command line encoding, and I cannot find the tool yuv2avi.

ffdshow can "decode" yuv with avisynth, but no program I have can open the .yuv file.

[Stingrey]

I decoded it with avisynth.
Just take RawSource form here: http://avisynth.org/warpenterprises/files/rawsource_25_dll_20060728.zip

and the avs File needs just one line:
RawSource("D:\down\rush_hour.yuv",1920,1080,"I420")

[Sefyu]

I still don't understand what I have to do, how do I make AviSynth work together with VirtualDub?
I read the documentation but I really can't figure it out.

[Stingrey]

Step 1: put the RawSource Plugin in your Avisynth Plugin Directory
2: create the avs file with the line I wrote, just change the path to the yuv file!
3: open VirtualDub or VirtualDubMod
4: in VD click "File" -> "Open video file ... CTRL+O" and select the avs file.

that's is all you have to do.

[Sefyu]

Thanks for the explanation!

[Stingrey]

No problem, always happy to help.