Help/suggestions with bitrate.

[Devil]

1Click is capable of doing all sorts of bitrate changes. What happens if you burn directly from VS?

[Fransl3]

For the videos I shoot with my Canon S3 IS camera (640x480 30hz AVI) I wanted a decent compression while retaining the best image quality.

MSU is a nice tool to help you do this. First generate an output file using a certain mpeg profile (bitrate, gopp, vbr, 1pass/2pass etc) then compare this file with the original (avi) file.

MSU gives an overall image quality figure as a percentage of the original movie. I got the following results: figures: (vbr, size + percentage wrt org file, quality = SSIM_YYUV %)
MSU produces a nice output movie of the differences between the original file and the test file - at low bandwidths it shows that a lot of detail is lost, while at high bandwidths the screen is mainly black, showing that there is a close match between the original and the test file.

ORG AVI: 17976 kb
_4M______ 4791 27% __ AVG: 0.9215
_6M______ 7341 41% __ AVG: 0.9578
_8M______ 9419 52% __ AVG: 0.96499
_8M__2P__10189 57% __ AVG: 0,97134
_9M__1P__10577 59% __ AVG: 0,96952
_9M__2P__11431 64% __ AVG: 0,97512
_8.6M_2P__11000 61% __ AVG: 0,9735
10M__1P__11737 65% __ AVG: 0.9736
_9.5M_2P__12100 67% __ AVG: 0,9765
10M__2P__12699 71% __ AVG: 0,9780
12M______15217 85% __ AVG: 0.9824

From the results it follows that 8M, 2pass gives better results then 9M 1pass - in fact, 8.6M 2pass is as good as 10M 1pass.
Also, the quality improvement using higher bandwidths then 8M2p is minimal, only 0.66% to 10M2p but the resulting file is 25% larger!

I now generally use the 8M2p setting, while using 12M2p for valuable footage where quality is more important then file size.

[Barney1]

1Click is capable of doing all sorts of bitrate changes. What happens if you burn directly from VS?

I will take a look tonight to see where I set that in 1Click. I don't recall seeing that anywhere. Thanks!

[Barney1]

MSU is a nice tool to help you do this. First generate an output file using a certain mpeg profile (bitrate, gopp, vbr, 1pass/2pass etc) then compare this file with the original (avi) file.

Fransl3, What is MSU and how can I get it? Thanks.

[Devil]

1Click is capable of doing all sorts of bitrate changes. What happens if you burn directly from VS?

I will take a look tonight to see where I set that in 1Click. I don't recall seeing that anywhere. Thanks!

1-click is not a burning app as such, it is a DVD-copy application and it will adapt bitrates for fitting. You should use the DVD burning bit of VS: you can do that at the same time as you create the DVD files. You can be sure that way that it is burning what you create and not what a third party software THINKS you ought to do.

[Barney1]

Well a fixed bitrate of 7000 and 8000, the video quality drops.

Devil,
I understand what your saying and I agree. I only use 1Click to copy the files that VS create during rendering. I can try to just burn to disc, but could you imagine the wasted disc I would have had. What I can¡¦t understand is if you set a variable bitrate with a max of 7000 how does the video get create with spikes well over that if you are telling it not to go over 7000? I see this when I create the DVD folder and play the video from WinDVD9. Thanks.

[Devil]

Haven't you heard of DVD¡ÓRW discs? You wouldn't waste any with them, until you got your project right.

[sjj1805]

Another option to stop wasting discs is to burn to DVD Folders instead.

[Ken Berry]

Gentlemen -- he *did* say this in his last post, and in others as well...

I see this when I create the DVD folder and play the video from WinDVD9.

[Barney1]

1Click is capable of doing all sorts of bitrate changes. What happens if you burn directly from VS?

Tried that same issue.

[Barney1]

Haven't you heard of DVD¡ÓRW discs? You wouldn't waste any with them, until you got your project right.

YES I have heard of DVD¡ÓRW disc. That is why I¡¦m writing to a DVD folder and then viewing it from WINDVD9.

Well I have finally gotten it to work without any freezing, by not checking the ¡§Two Pass¡¨ function when creating the DVD and/or DVD folder. Doesn¡¦t make sense, but I¡¦m all out of options and patients as far as this project goes. There is some quality difference, but not that noticeable on lets say a 32¡¨ TV which is what most if not all the people I¡¦m making this video for have. As far as my viewing options, I can bump the bitrate to 9696 @100% with two-pass checked and it plays fine and looks pretty good on my 65¡¨ HDTV using PS3 as the player with no problems. If I can get the PS3 to recognize .avi files that would even be better.

[Fransl3]

[quote="Barney1"][quote="Fransl3"]
MSU is a nice tool to help you do this. First generate an output file using a certain mpeg profile (bitrate, gopp, vbr, 1pass/2pass etc) then compare this file with the original (avi) file.

[/quote]

Fransl3, What is MSU and how can I get it? Thanks.[/quote]

Barney,
1st sorry for a late response, I dont check this account very often...

MSU Video Quality Measurement Tool can be found at:
http://***/video/quality_mea ... ol_en.html

Usage is pretty straightforward, only thing is that for MPEG2 you need AviSynth - create a .avs file containing a line as follows:
DirectShowSource("c:\<path>\<moviename.mpg>", fps=<framerate>)

The MSU output clip clearly shows the distortion; the following 2 images show the rather significant distortion for a 6Mb 1pass clip, compared with a 8Mb 2pass clip.

Hmm... can't attache the images... too bad...

Rg,
Frans
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