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difference between m2t and mpeg2

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Seamus
difference between m2t and mpeg2
on Mar 13, 2007 at 7:00:21 am

Can someone clarify this for me?

My understanding is that m2t is an mpeg2 format.
so what is the difference between .m2t and a .mpeg file (mpeg2 muxed)?

Client is asking for...

"Format: MPEG2 sound+vision embedded in a single ".mpg" file.
Pixels: 720x576
Profile: MP@ML Aspect Ratio: 16:9
Visual BitRate: Min: 6.0 Mbps Optimum: 8.0 Mbps Max: 10.0 Mbps Audio: 192Kbps @ 48khz/16bit or better. "

so I guess my .m2t file is wrong.
I'm abit unclear about the two.
Thanks for your help.

Seamus


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Ben Waggoner
Re: difference between m2t and mpeg2
on Mar 14, 2007 at 4:33:52 am

.m2t is a Transport Stream, used for broadcast. Typically, they will use Dolby Digital audio instead of Layer II.

.mpg is a Program Stream.


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Seamus
Re: difference between m2t and mpeg2
on Mar 14, 2007 at 9:04:41 am

Ben, thanks for your reply. I just needed to be pushed in the right direction. :)

OK Ive read up a little about transport stream vs program stream

(in laymans terms)

Transport stream is used for broadcast but also the encoding for DVD.

Program stream (and this is very basic description) will be a file with a quicktime icon rather than the .m2t or .mtv files. (???)

Now, how would I get a program stream mpg2 out of compressor? I've tried a number of settings but it only seems to output .m2t or .mtv files. (For mpg2)

The way around it is then taking those files and running them through streamclip. That seems to have a mpg2 muxed setting I can convert too.

Is this right?

Again thanks for your help.





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