demux sound : bad name

[Alain_French]

Hi,

I have a little problem with the method...
I capture my tv program with a hauppauge nexus-s in mpeg2.
Then I make a dvd with ulead dvd movie factory : 6Go
Then I want to reduce the size so i use the usual method but there is a problem...

this is the stream information :
0xC0 - Audio - MPEG-1 / 2ch / 48kHz / 16bit / Unknown (' ') / LBA: 8 / PTS: 00:00:00.194 / Delay: -40ms
0xE0 - Video - MPEG-2 / 720x576 (PAL) / 4:3 / LBA: 1 / PTS: 00:00:00.234 / Delay: 0ms

And when dvd decripter (last version) demux video and audio, it makes 2 files : the video is ok, but the audio name is bad : VTS_01_PGC_02_1 - 0xC0 - Audio - MPEG-1 - 2ch - 48kHz - 16bit - Unknown (' So when reauthorist does not find the audio stream and its calcul for the bitrate and the script file for scenarist forget the audio :(

I know that the problem is in dvd decripteur, but i dont know how making a good audio name...
- perhaps i have to change the IFO to change the Unknown (' ') value (i dont know where i can change that)
- perhaps i can rename the audio file and reauthorist will find the file, but i dont know how rename it !

I hope you can help me :)
Alain

[fnordpojk]

I have to bump this..

I have the exact same problem.

It seems to be related to the DVD having no language code for the audio track (don't know if this breaks the DVD specification, but it's a store-bought pressed DVD).

DVD Decrypter is giving the file the wrong name (cut off, just like Alain's was), and thus DIF4U/Reauthorist can't read it.

Help? Anyone?

[ShaneZ]

well, there may be a more elegant solution to the problem, but what i would do is manually import it into scenarist. just make sure when you are encoding your video that you take into account the audio bitrate and subtract that from the max bitrate on the video. so if you had a 48k audio track your max rate would be [RA Max Br]-48.

then when you get to scenarist, import your audio track in manually. there may be an easier solution like renaming the file, but i have never run into this problem. hopefully someone can give you some pointers.

;)

[Raster]

Not sure about this but it could have something to do with your audio source (MPEG-1). I've never ran across MPEG-1 audio myself. I think thats not allowed in the DVD specs. Has to be AC3, DTS or PCM if I remember right (I'll have to check this). I think MPEG-1 is only used for VCD. Try converting your audio to one of those formats before you start to author in Ulead DVD Movie Factory.

@fnordpojk

Is the audio on the original DVD showing up as MPEG-1 as well?

[arlsair]

MP2 alias Mpeg1 Layer 2 is allowed. But probably ReAuthorist have a problem with MP2.

[Raster]

Ok I checked. MPEG-1 or MPEG-2 audio is not allowed by itself. Must be included with either AC3 or PCM track.

Also, there is a difference between MPEG-1 and MPEG-2 (MPEG-2 is not MPEG-1 layer 2).

Like I mentioned before, try converting your audio to AC3 or PCM before authoring.


This was taken from the Scenartist Manual:
----------------------------------------------------------------------
1.3 Preparing Audio Assets
The options for audio in DVD are almost limitless...

The DVD Specification defines that a title sold in either the NTSC (525/60)
or PAL/SECAM (625/50) video markets must have an audio track in Linear
PCM or AC-3. A DVD title that includes only MPEG audio, for example,
would be in violation of this specification.
VBR is possible with audio encoding, but most encoding systems do not
support it.


1.3.3 MPEG Audio
MPEG audio compression (similar in principle to AC-3) converts audio
sample frames to the frequency domain (a mathematical construct
through which audio information can be transformed into frequencies,
which can then be transformed into numbers). Using principles of audio
masking, different frequency bands are encoded with differing numbers of
bits.
Many MPEG video encoding systems are capable of capturing MPEG-1
audio in stereo. MPEG-2 audio encoders can handle configurations up to
7.1, with an additional two speakers in the front. DVD supports various
MPEG-1 and MPEG-2 audio formats with a sample rate of 48 kHz:
• MPEG-1 Audio (2 ch.) ................................. up to 384 kbps
• MPEG-2 Audio (7.1 ch.) .............................. up to 912 kbps
Encoding systems for multi-channel MPEG audio are emerging.
------------------------------------------------------------

[LIGHTNING UK!]

Do me a favour and send me the IFO file to the VTS set you're having problems with. i.e. VTS_01_0.IFO

I'll take a look as to why the characters are causing my program a problem.