Problem .mpg (mpeg-2+ac3)

equus wrote on 10/22/2007, 3:41 PM
I have tried to process an old video which I made and I ended up using video codec MPEG-2 and audio in ac3, multiplex both to ".mpg".

It is possible that architect 4,5 does not detect audio in ac-3 within the file mpg? I have tried it to read in vegas pro soft and happens the same, the audio one in ac-3 is not detected, vegas 7 yes.

Comments

Chienworks wrote on 10/22/2007, 6:05 PM
There's no need to do the multiplexing step yourself. DVDA will do it for you. If you've given the .ac3 file the same name as the .mpg file and it's in the same directory then DVDA will use it automatically. If not, you can double-click the mpg file in DVDA to open it up on the timeline, then drag the .ac3 file from the explorer window onto the timeline and make DVDA use it. Part of DVDA's prepare step is to multiplex the audio into to the resulting .vob file for you.
richard-courtney wrote on 10/22/2007, 6:05 PM
I am not 100% certain but I don't think AC3 is part of the mpeg spec. VOBS yes.
ATSC yes.

If you import the file instead of dragging to the timeline does it detect it?

equus wrote on 10/23/2007, 11:42 AM
Thanks to both responding.

For Chienworks, it did not create a problem since generally not multiplex and him passage to architect the two streams separately, only the surprise to state that architect initially did not load and when verifying with vegas pro, I have not thought either about a possible small error.

For RCourtney, I have put in practice your solution using “insert Media” and it does not work either. The peculiar thing is that renamed to “.vob” yes that it recognizes the audio one directly, without recompresion of course.

It is normal or it is a small error?
MPM wrote on 10/24/2007, 10:08 AM
If it helps...

DVDs store separate streams in the vob files -- you don't want muxed mpg because they have to be split up anyway... Sometimes the software will split it for you, sometimes not. Muxing & de-muxing is a simple affair handled by a number of (often freeware) tools -- just process your media however needed before import into your choice of DVD authoring software.

Mpg2 video is not all identical, and may or may not be DVD compliant, or compatible with your software, so it's very possible to have problems with the mpg2 itself depending on where & how it was encoded. The same goes for ac3 files. If one or the other doesn't import into DVDA often the file can be repaired or the 1st mpg2 header changed.
equus wrote on 10/24/2007, 2:13 PM
Very been thankful by the explanations. I understand them and I understand.
But they do not explain the essential, So that he himself file .mpg is read by vegas 7.0?

Thanks again.
MPM wrote on 10/24/2007, 4:13 PM
Hoping it helps...

Mpg2 video can be stored in a few ways... One of them is a standard video stream, usually with an m2v file extension. It can also be muxed (combined or multiplexed with an audio file) to form an .mpg file. Sony software likes mpg files, whether they include an audio file or not -- you can create a mpg file for example by muxing a m2v file and no audio file in TMPGEnc's Mpeg Tools.

Vegas will normally import mpg files -- though not m2v -- and performance may be slow because it has to draw frames (from those incomplete P & B frames in the file). You can also use 2 programs called DGIndex & VFAPI to open a proxy of a mpg2 file (even m2v) in Vegas that doesn't slow the program down. If the mpg file includes audio, Vegas will import it unless the audio is ac3 -- in that case you have to use features to import video/audio from DVD cameras. Since you can't edit ac3 files, the importing them into Vegas might be useless anyway -- for editing convert to wav format.

Older versions of DVDA will only import mpg video streams, or if m2v, converted as above. Current versions will import m2v but only with a delay, and performance can be iffy or buggy depending on the file. They all should import ac3, but it may take a while if the ac3 isn't from Vegas.

For software to mux/de-mux files, DGIndex & VFAPI, repair or convert mpg2 and ac3 files, please see videohelp.com or doom9.org -- believe that they have sites in Spanish too.