Avisynth: Encoding a Video Twice to get Better Quality?

Kane · #1 04-16-2003, 07:30 AM

i´ve got a video file, which is actually more noise, blocks and artifacts than movie. i tortured this file with a script with nearly every filter i know, it took tmpgenc 21hours

to encode.
the result is very good, no more artifacts , reduced noise, but it´s still unsharp as hell.

is it worth encoding the file a second time to sharpen it?
never encoded a movie twice, and i don´t want to wait another 21hours to find out, the image is not better than before

could you suggest a filter to use (unfilter, sharpen, or something else)?

thanks in advance

digitalize · #2 04-16-2003, 08:20 AM

I had good results running a sharpening filter over a previously encoded mpeg2 video. I did not change any settings in TMPGEnc, left them identical to the first encode. I just removed all of the other filters out of the script and added the sharpening filter. Unfilter is a fast sharpening filter you could try.
It should not take 21 hours if you are using only Unfilter in the script. The stronger you set the sharpening the longer it will take though.

Kane · #3 04-16-2003, 08:40 AM

thx, i will make some samples to see, what gives me the best quality

Kane · #4 04-16-2003, 09:54 AM

hmm, next problem

i created a .d2v file with the mpegdecoder.dll for my kvcdx3 mpeg file, and made a new script.
when loading this into ToK , it shows me

length: 40min

but the whole video lasts 90min.

i used this to create the d2v file

Code:

LoadPlugin("E:\MPEGDecoder.dll")

MPEGSource("E:\nightwish sample.mpg")

and this one to encode

Code:

#==============================================#
# -= AviSynth script by MovieStacker v1.1.1 =- #
#==============================================#

LoadPlugin("E:\Appz\MovieStacker\Filters\MPEG2Dec.dll")
LoadPlugin("E:\Appz\MovieStacker\Filters\GripFit_preview.dll")
LoadPlugin("E:\Appz\MovieStacker\Filters\LegalClip.dll")
LoadPlugin("E:\MPEGDecoder.dll")

MpegSource("E:\nightwish sample.d2v")
LegalClip()
GripCrop(528, 576, overscan=2, source_anamorphic=false)
GripSize(resizer="BicubicResize")
GripBorders()
LegalClip()

digitalize · #5 04-16-2003, 10:10 AM

There are some issues with MPEGDECODER that are discussed at Doom9.org. I do not know if that is one of them. Try using DVD2AVI version 1.76 to create your D2V file.

Kane · #6 04-16-2003, 10:15 AM

is it possible to open an mpeg1 kvcd with dvd2avi 1.76?
i tried, but it did not work

kwag · #7 04-16-2003, 10:22 AM

Quote:

Originally Posted by Kane

is it possible to open an mpeg1 kvcd with dvd2avi 1.76?
i tried, but it did not work

No. It won't work. However, you can open it with Vdub and then frameserve to TMPEG

Note on re-encoding: If you re-encode an mpeg file, every time you re-encode, you add one layer (generation) on encoding over the prior encode, and the result will be worse every time. Just like if you make a copy of a VHS, and then again make another copy of the copy, the result will always be worse. And so on...

-kwag

Kane · #8 04-16-2003, 10:29 AM

Quote:

Originally Posted by kwag

No. It won't work. However, you can open it with Vdub and then frameserve to TMPEG

-kwag

aha,
what must i do, to "frameserve to TMPGENC"?

kwag · #9 04-16-2003, 10:38 AM

Quote:

Originally Posted by Kane

aha,
what must i do, to "frameserve to TMPGENC"?

Open your mpeg-1 file with Vdub, and then click on "Start Frame Server..". Read Vdub help's screen. It's all detailed there.

-kwag

Kane · #10 04-16-2003, 10:53 AM

to be honest, i do not understand a single word of the vdub "help"

i guess, i have to try it again with mpegdecoder, it has worked before, so it has to work now, too

PyRoMaNiA · #11 04-20-2003, 04:25 AM

Quote:

LoadPlugin("E:\MPEGDecoder.dll")

MPEGSource("E:\nightwish sample.mpg")

You're supposed to put the total number of frames when using MPEGSource.

So your script should look like this:

Code:

LoadPlugin("E:\MPEGDecoder.dll")

MPEGSource("E:\nightwish sample.mpg", #)

Where # equals the total amount of frames. Open in in VDub to find out.