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Old 06-11-2007, 09:37 PM   #1
Chris Barnard
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If I have a MPEG2 as a program stream encoded at 6000bps and want to turn it into an MPEG2 as an elementary stream, with as little loss of quality as possible, what do I do?

Is it as simple as putting it in Pcoder, and re-encoding it? I don't know the process - does Procoder encode the already encoded file, so in effect it is recompressing from the original 6000bps? Or in this case will it simply avoid re-encoding and simply split the audio?

I'm confused. Is there a thread that would explain this?

Thanks!
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Old 06-11-2007, 09:49 PM   #2
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ProCoder does not support lossless demultiplexing (aka demuxing) of MPEG streams. It will always reencode your data, which introduces time and a generation loss.

Your best bet is to scour the Internet for a free demuxing tool. I actually use MPEG Streamclip: http://www.squared5.com/

Admittedly, it does a little bit more than just demuxing, so you may find simpler, more direct apps out there.
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Old 06-11-2007, 09:56 PM   #3
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Cheers Mr Sparkle,

Now I know what to look for... THanks!
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Old 06-11-2007, 09:57 PM   #4
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TMPG does it too...even the free trial version. Just go to Tools and you'll see a bunch of options.
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Old 06-11-2007, 09:57 PM   #5
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but presumably Streamclip is NOT free?
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Old 06-11-2007, 10:33 PM   #6
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HI Mr Sparkle,

Got Streamclip up and running. Gave me a very nice M2v video but there does not seem to be an option for demuxing the MP2 audio from the MPEG2 video.

DO I need to go for the 'headed' or 'unscaled' options?

As it was I just chose 'demux to m2v...' from the file menu. I thought it would give me an option to set the destination folder for the demuxed audio, but it went straight to processing. I have a video but no audio....
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Old 06-11-2007, 10:36 PM   #7
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ACtually, could I just put the MPEG2 file in Edius and export the audio as a PCM/wave file and then make an AC3 file from that (which is what I ultimately want the audio as)?

Seems a pretty simple solution, but are there any things to watch out for?

Thanks,

Chris
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Old 06-11-2007, 10:37 PM   #8
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Chris did you try TMPEG?

http://www.tmpgenc.net/
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Old 06-11-2007, 11:22 PM   #9
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Quote:
Originally Posted by STORMDAVE View Post
Chris did you try TMPEG?

http://www.tmpgenc.net/
Not yet, but I'm sure I will. Does that demux? At the moment, my procedure in Edius is resulting in a wave and AC3 stream that is out of synch by about 1/2 a second.
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Old 06-12-2007, 12:52 AM   #10
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Obviously it demuxes, or else I wouldn't have posted about it :)

Plus it's free.
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