Really noticeable blocks when encoding DV2 to Mpeg2

[Z.Sath]

Trying to encode some old Tex Avery laserdiscs to Mpeg-2.

Generally good results excpet for a certain section where there's a lot of action and a lot of dark red.

At this point blocks start appearing which are a slightly different shade to the actual background.

Tried both TmpgEnc and CEE but get the same problem.

Any suggestions?

Thanks in advance

Paul.

[Keitho]

What bitrate are you encoding with? I've used TMPGENC and CCE at 8000 CBR and get good results.

[manono]

And how are you frameserving the video? The reason I ask is that one sign of bad colorspace conversions is messed up reds. This is especially true for interlaced sources. Use AviSynth, converting to YUY2 for CCE and RGB24 for TMPGEnc.

[Z.Sath]

I am frameserving the DV to CEE using AviSynth.

my script is:

SmoothDeinterlacer(ttf=false)
ConvertToTUY2()
TemporalSoften(4,4,8,15,2)
AudioDub(BlankClip())

Get same effect with or without script, and same as with TMpgEnc.

[Z.Sath]

Sorry, forgot say bitrate:-

encoding with VBR avg 5500, min 2000, max 8000.

Cheers.

[manono]

Hi-

OK, why are you deinterlacing it? Is it interlaced? Can't you leave it interlaced? Does it have blended fields from an NTSC to PAL conversion? And if I'm not mistaken, that's a fairly strong setting for TemporalSoften. I could be wrong, as I haven't used it for awhile now.

In any event, you're doing the colorspace conversion properly, so that's not it. I would now focus my attention on the 2 filters you're using as the source of the problem, as long as you're sure that the blotchy reds aren't in the source. I would also check the Q-Scale in the VBR Bit Allocation Window of CCE to see if the Q climbs real high during those fast motion scenes. If so, maybe raise the max bitrate.

[jagabo]

Maybe your black levels are off and those dark areas should be darker.

[mikiem]

I *think* I've read threads where the colorspace used on some laserdics were way off any specs?

2nd guess, would this help? http://forum.doom9.org/showthread.php?t=82217