Xvid to mpeg2 using avisynth, CCE - extreme jerkiness! HELP

[neonmod]

I am Trying to convert an XVID avi which is 23.976fps to mpeg2.

I have written a basic avs script for use with CCE as follows:

LoadPlugin("C:\PROGRA~\DVD2SVCD\AVISYN~1.5PL\Mpeg2dec\MPEG2D~1.DLL")
AVISource("D:\Movie1.avi",False)
ConvertToYUY2()
LanczosResize(720,348,0.0,0.6)
AddBorders(0,66,0,66)

I have played the avs file before conversion using media player but the playback is really jerky with frames overlapping and juddering like an old projector movie!

I have tried encoding anyway with CCE and tried pulldown with the same result.

Other xvid files are ok but not this one!

GSPOT info for the file is

Video
4CC xvid
bitrate 963kb/s
fps 23.976
Qf 0.245 b/p

Audio
ac3
bitrate 448 kb/s (5ch)
Fs 48000hz

When i play the untouched xvid avi file in media player it is perfect.

Please can anyone help me with this!
(Tearing my hair out!)

[Gazorgan]

3:2 pulldown is required to play it, that may be part of the problem.

The audio doesn't look like AC3, it looks like DTS (based on the bitrate). That shouldn't be a problem, but it depends on the decoder.

What are the specs on the source file? Gspot is useless for that, what's the size, length, and resolution?

[neonmod]

Thanks for replying bud!

File length
03:20:57 (289,080 fr)

xy size
640x256 (2.50:1) [=5:2]


what program other than GSPOT will give better info?

cheers!

[Gazorgan]

You didn't answer my question.

Sigh.

How big is it?

[neonmod]

Soz bud!

The file is 2.05 GB.

[Gazorgan]

Thanks. The size is critical.

Okay, there's only 3 movies that fit the bill, shame on you!!!!

It's anamorphic (as opposed to 4:3 or 16:9(called widescreen)). It's ummmm (bad day at work here) about 2.21:1.

2 GB is good for most DVD9's. That means the orignal source is probably in the 6 GB range. Movies in the 2 hour range also. 3 hours and 20 minutes is LONG! Your on the low end of bitrate for being 'good'. ESPECIALLY with the audio!!!!

To fit that AVI onto a DVDR you need an average MPEG2 bitrate of 2600( look here: https://www.videohelp.com/calc.htm ). Aint ever going to happen at full D1 resolution. It will always look like crap. Even allowing for letterboxing.

Now there's an alternative. Encode it at 1/2D1 resolution. That's 352x480, and an average bitrate of 2600 is fine. Set your max at around 5000 (2-pass VBR).

Your other alternative is to put it on 2 DVDR's. Then you double the average bitrate; 5200 average is quite good. Just cut it in the middle at a good scene change.

[neonmod]

I have tried cutting the avi into 2 files but i still get the same choppy result when previewing the avs file in media player.

I have used this method before with other large xvid avi's that are around the same size and used a bitrate calculator etc... with no problems.

I have heard that the avs file streams the avi file raw uncompressed into cce, so if the avs playback is not correct, the end cce result will be the same.

Could this problem be codec related.

Gspot reports that ffdshow is used to decompress the file!

Any idea's?

[Gazorgan]

You most definately don't want to cut it in 2, that jsut makes more problems.

Open the file straight in you media player and watch it. The AVS script is only going to add overhead that your CPU may not handle (what your your computer specs?). Watch it in the middle, in one of the fight scenes. If it looks good full screen, then don't worry about the source.
Have you checked the source in VDUB for bad frames?

You will want a program called AVIMUX to strip out the audio undamaged. Save that for the authoring process later.

You can simply do a test encode at a CBR rate of 6000. Encode a few minutes so you can get past the intro credits. If the encode looks good (should be no audio, don't worry about it, it's a seperate issue), then your AVS script is fine.

I use 3 different encoders, and none of them are CCE, I'm weak on what it can and can't do. I'm willing to bet the source is progressive. You will need to convert that to interlaced for CCE? You will also have to set the 3:2 pulldown flag since the source is 23.97 fps. There's a way to leave it a progressive encode, but I don't want to go into that with a 23.97 source.

[neonmod]

My PC is a P4 2.5ghz 512mb , 240gb raid hard disk.

I will try a few things.

Thank you very much for your help.

Will get back to you tomorrow.

Cheers!