DVDRB 0.88 always set max bitrate to 9000?

[eriksen76]

I just did a encode of a movie with both 5.1 and DTS

The specifications for the audio traks are:

5.1 (448 kbit)
DTS (1536 kbit)

The problem is that CCE keep on setting the max bitrate to 9000

The minimum is 500 (as by default)

As far as I know the combined bitrate of the video and all audio streams associated with it can't exceed 10080kbps

10080 - (448+1536) = 8096!

So I guess it will be a problem when DVDRB tells CCE to encode with 500-9000

I had to put in a min_bitrate8000 in the .ecl file, but with older versions CCE did that automaticly.

I use CCE 2.67.00.27 trial with / eclcce 1.81 to make it work with DVDRB.

I rarely have this problem as DTS tracks with 1536 are pretty rare.
But this has been a problem for me since DVDRB 0.80 (I think) and I made a thread about the problem long time ago, but it might have be over-seen.

Please test for yourself to see if I'm right about this problem.

I believe I had the same problem with CCE 2.70.00.20 but I went back to the older version because of its stability with DVDRB.

Thanx

/Eriksen76

[pg55555]

It does not change your issue, but I think your mathematics are wrong.

The maximum bitrate for the DVD specification must be related to those stream that are being reproduced simultanously- So One Video+one sudio+one sub.

If so, your fromula shoul be:

Max Bitrate =10080-1536= 8544

[jdobbs]

I'll look at it again, but in looking at it last time, I can't see how the maximum bitrate could get calculate that high. Also... remember you are only talking about the MAXIMUM bitrate. Your output video reaching that bitrate almost never happens (look at it with bitrate viewer). If it does spike for a short period the video buffer can absorb it.

In other words -- yes, I'll look at it, but I also believe you are fretting over a non-issue.

[jdobbs]

You also are mistaken in your numbers. DTS is not usually 1536 (that's the maximum it can be which I don't think is common). Normally 6 channel DTS is 754.5Kbs. 1536 would be the common rate for LPCM. So if you add 754 to 9000 you would be under 9800Kbs...

[jdobbs]

I just did several tests and in every one I did the maximum bitrate was reduced by the total bitrate of the audio. It subtracts the total bitrate of the audio from a fixed value of 9800. It then takes the lessor of the max_bitrate (default is 9000) and the result.

Do you have an entry in your REBUILDER.INI that changes "max_bitrate="?

[eriksen76]

Originally posted by jdobbs
You also are mistaken in your numbers. DTS is not usually 1536 (that's the maximum it can be which I don't think is common). Normally 6 channel DTS is 754.5Kbs. 1536 would be the common rate for LPCM. So if you add 754 to 9000 you would be under 9800Kbs...

I did not write that "DTS in usually 1536" I wrote:

"DTS tracks with 1536 are pretty rare" - I got the 1536 info from Powerdvd playback, but It might be mistaken.

I don't have a "max_bitrate=" in my your REBUILDER.INI - Only a "Targetsectors"

Is what PG5555 wrote true??
--------------------------------------------------------------------
"The maximum bitrate for the DVD specification must be related to those stream that are being reproduced simultanously- So One Video+one sudio+one sub.

If so, your fromula should be:

Max Bitrate =10080-1536= 8544
--------------------------------------------------------------------

I'm a bit confused about the calculation you (Jdobbs) wrote:

"So if you add 754 to 9000 you would be under 9800Kbs"

Where does 9800 come from compared to the value 10080???

I thought the total had to be under 10080 - You say that it has to be under 9800?

In my case with both 5.1 and DTS (1536 according to Powerdvd) I guess it had to be lowered.

Please explain in details for me, to make sure I get this right.

Thanx for your time

/Eriksen76

[jdobbs]

While 10080 is the maximum total bitrate (all video/audio/subpictures), 9800 is the maximum bitrate allowable for video. So even though a video track of 9900k with a mono audo track of 96K would be under the 10080Kbs it would still be non-compliant because the video is above the maximum of 9800kbs.

If you are so worried about it, change your maximum bitrate. As I said, I don't think it's an issue.