Compiling error message in Maestro

[shaul]

Hi all,

I got the following error message after compiling:

" LenguageMenue1 : Invalid Alternate Menu In Display Condition. Condition ignored!

- During Muxing at least one instance of Buffer under-flow was detected. This is due to exceeding the Max. Bitrate."

What should I do in order to solve the problem?

Thanks

Shaul

[BJ_M]

1. sub picture is not valid -- you can ignore that one..

2. second error -- lower your bit rate ... it's to high ...

[shaul]

Thanks,

What do you mean subpicture not valid?

[freestyler]

those are some wierd errors man, care to share what kind of dvd you're working with / making?

[shaul]

Sorry for not understanding. where is the problem and how can I solved it?

[freestyler]

People who have Maestro will quickly find that it is not a user friendly software for people not already very familiar with dvd (ie know what they're doing), and Scenarist is even worse in that respect. I am also doubtful about people sharing their knowledge of Maestro openly, because very few people know it well and the ones that do, are greedy about their knowledge that I've seen thus far in my travels.

With direct regards to your question, your best bet is looking through your Maestro manual under troubleshooting or in the menu section

[BJ_M]

Well you can be doubtfull but my answers are correct anyway ...

[shaul]

thanks
The problem is that the bitrate is 1.15 as VCD. Lower than that I can't
imagin

[BJ_M]

thanks
The problem is that the bitrate is 1.15 as VCD. Lower than that I can't
imagin

yes -- that sure is low and dont know why you are using a bit rate that low ..

the error msg means 1 of two things .. either there was a VBV buffer underflow in the encoding (wrong VBV for dvd) or that the multiplexor buffer detected a underflow in the VB caused by to high a combined audio and video bit rate ..

if you say you are using 1500 bit rate - your encoding parameters are then incorrect for DVD (maybe you have them at VCD ? instead of DVD for VBV?) , at that low bit rate you may have to hand tweak it .

[SLK001]

A VBV buffer underflow is just a WARNING, and can be ignored (usually) for VBR streams.

An EXCEEDED MAX COMBINED BITRATE is an ERROR and Maestro will ABORT the compile.

As for the DVD MAESTRO experts not willing to share their knowledge, this is mostly due to the fact that the poster doesn't give enough information for us to even attempt to help him.

I know Maestro pretty well (and I love the thing) and BJ_M knows it very well, too (probably better than I do), and we are both willing to share this knowledge - but we're not mind-readers and I will just skip a post that doesn't give enough info.

[SaSi]

thanks
The problem is that the bitrate is 1.15 as VCD. Lower than that I can't
imagin

If the MPEG stream is encoded as VCD, then the bitrate is supposed to be constant, not VBR. CBR@1150 cannot cause either an over-run or an under-run, or so I understand.

Did you encode the video yourself? If so with which encoder and settings? Have you tried re-encoding it ?

[BJ_M]

CBR means acually constant bit rate INTO the buffer .. real world CBR will have varable bit rate , but the data going I/o to the buffer is constant ... the VBV buffer (vs. the multiplexer buffer value) is an imaginary buffer and not that importaint for software decoding .. but very importaint for hardware decoding ..

[shaul]

Did you encode the video yourself? If so with which encoder and settings? Have you tried re-encoding it ?

I encoded in Premier as VCD . Is that wrong? is tht what cause the error message?

[Faustus]

maybe I missed someone explaining this above me. But the subpicture USUALLY in maestro refers to the second bmp picture you drag into a menu creation box to specify the highlightable portion of a menu.

[shaul]

I use the subpicture as a title, since I use special font and besides it I have problem to uae the subtitles, it is always cropped when I see it in the navigation simulator.

[arminio]

I am going back to root of this problem:

I have VHS captured material encoded with CCE 2.50 (DVD compliant option checked), VBR 1pass: avg bitrate 6100, min 0, max 8000
Audio encoded with AC3 encoder from Maestro, bitrate 244

DVD Maestro during authoring report warning message:

"During Muxing at least one instance of Buffer under-flow was detected. This is due to exceeding the Max. Bitrate."

I detect that warning message does not occur if I remove AC3 track. But existance of any audo track (AC3 under various bitrates, MP2, even WAV that I tried) produce that warning.

I checked lot of post here and around other forums but I still don't know is this problem or not and in what case can be problem.
Somebody recommends that "DVD Compliant" option in CCE can produce this but I encoded tons of material with that option and never get this warning before.

I am worried about result because when I made SVCDs and get this type of warning (usually while muxing with BBMPEG), SVCDs often have problems with playback - will that be case with DVD also?

Maybe something can be done to audio to avoid this if this warning msg need to be avoided at all ?

[Arky]

Did you encode your .ac3 file in Stereo or multichannel?

If it was in stereo, did you encode at a bitrate higher than 192kbps?

I was told recently that sometimes, players take exception to unexpectedly high bitrate-per-channel. Perhaps Maestro is aware of this and is flagging it accordingly?

I must say, the symptoms you describe, and the circumstances under which you say they have occurred, seems very strange to me. I used to use Maestro a lot, and I never experienced the error messages you describe. I would not expect you to get errors about audio bitrate when you use a .wav file. Weird.


Arky ;o)

[arminio]

>Did you encode your .ac3 file in Stereo or multichannel?
>If it was in stereo, did you encode at a bitrate higher than 192kbps?

Stereo, 224kbps.
But, problem occurs inany audio file (WAV, MP2) so looks like video bitrate combined with any audio "looks" too much for Maestro...

I tried with small AC3 - just 5 minutes, encoded with the same bitrate and settings and put instead original audio with original 1h30m video and result was without warning message.

It is obvious that muxing at some point produce buffer underrun ...

Should I ignore that or try to fix (if it is possible without re-encoding) ?