Change audio in mpeg2

[helpa]

I have an mpeg2 with LPCM audio and I wanted to change it to mpeg audio can I do it without rencoding the whole mpeg?

I was thinking about:
1) Demultiplex audio and video (TMPGEnc)
2) Convert the audio LPCM -> mpeg (224Kb)
3) Multiplex the two streams (TMPGenc)

The problem is that when I tried to multiplex the final streams TMPGEnc refused because of the mpeg2 license - so I understood that it tried to rencode the movie is that true?

How can I accomplish with the audio change without touching the video?

[rsquirell]

It won't let you multiplex the streams made from the Dazzle capture...you have to put them together by processing ( if you're an NTSC user...I'm told PAL users have no problems, though). You can change the audio from 48000 to 44100 in the "settings" area for the DVXCEL Test Utility and capture at that.

[helpa]

Thanks,
This was a general mpeg2 question not directly connected to the Dazzle. For the Dazzle I may write my own program to convert the headers (I suspect the ,peg decoding is OK).

The Dazzle 44100 is not functional, no matter what you put there it will capture 48KHz LPCM.

[rsquirell]

"TMPGenc refused bedause of the MPEG2 license"...is your TMPGenc a trial version whose time has run out? The DVC-150 is an MPEG2 device...that means it captures in MPEG2...

[helpa]

Let me clarify:


My point was completly different!!
I wanted to know if there is a multiplexer which doesn't encode the movie i.e. if I have an mpeg2 video and mpeg audio it will just multiplex them into a stream.

I'm using the free version of TMPGEnc which has mpeg2 license for only 30 days (expierd in my case) - because the TMPGenc refused (due to licens) I understand it tried to rencode my stream which is not what I'm looking for.


The other option is that tmpgenc doesn't care what is your source and doesn't allow mpeg2 output if you passed the 30 days.

[rsquirell]

Buy the program...it's worth it.

[helpa]

You miss my point I DON'T WANT IT if it rencode my stream!!

I'm seraching for a way yo multiplex mpeg2 video with mpeg audio WITHOUT encoding.

[setarip]

To helpa

TMPGEnc WILL NOT re-encode when you multiplex as follows:

TMPGEnc>>File>>MPEGTools>>Multiplex

[rsquirell]

If he reads my answer in his Dazzle DVC-150 thread about taking the raw capture into TMPGenc DVD Author-to DVDShrink-to TMPGenc for demux/convert audio/remux he might figure out that no reencoding has ever occured. But...if he wants to make that SVCD...reencoding is inevitable.

[setarip]

To rsquirell

I don't see ANY reference to SVCD in any of "helpa's" posts to this thread - only MPEG2 in and MPEG2 out...

[rsquirell]

I know...and he doesn't initially mention that it's a Dazzle made MPEG2 made with their proprietary capture software...which behaves differently (unbenownced to him) than MPEGs of different genre. If he's NTSC TMPGenc will refuse the m2v stream in simple multiplex even though TMPGenc was the tool used to demux it out in the first place. Something about MPEG standards being set by the manufacturers...and Dazzle wanted you to use their software to process.

[helpa]

First of all my apologies I didn't have any intention to duplicate questions in two threads.

It's true that my mpeg is Dazzle but that's a separate issue!! I believe I would be able to convert the Dazzle output to a "regular" mpeg2 stream.

My question was specific to TMPGEnc multiplexing: when I took an mpeg2, demeultiplexed it, processed the audio and then multiplexed it back TMPGEnc asked for mpeg2 license, from that I concluded that it rencode the stream. I just wanted to know if this is true before I'm going to buy their license.

BTW, why does it matter if it's SVCD, I thought that the stream data is a regular mpeg2 (at specific bitrate and frame limitations) and that all the SVCD related data is entered through the "additional" directories and files in the SVCD structure.

So even for SVCD output I wouldn't expect rencoding of the mpeg2 stream.

[rsquirell]

An SVCD is a specific type of MPEG2 that you can play just like a DVD...but it's burned with a CD burner on a CD. When you select SVCD with the editing software (ie. TMPGenc) it selects a SVCD template and reencodes the MPEG2 to conform to that template so the CD will, in fact, play on those few stand-alone DVD players that will play them. It doesn't matter what MPG resolution you use during capture...making the SVCD doesn't happen until you process it as such.

[helpa]

Thanks