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Compression technique/standard used in MPEG2 Transport Stream

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Syed Irfan
Compression technique/standard used in MPEG2 Transport Stream
on Nov 2, 2010 at 7:51:41 am

Hi all,
I am trying hard to find what compression method is used in MPEG2-TS. On a wiki page (link given below) it 'appears' to be h.262 but I am not so sure as the wording is vague.
http://en.wikipedia.org/wiki/MPEG-2

I also found out that the compression method used in MPEG is DCT and block-based scheme with motion compensation. Does it mean that MPEG2-TS have the same compression method?

On a forum, I found out that typically h.264 is used for compression in MPEG2-TS .
So which one is it?

Thanks in advance


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Walter Soyka
Re: Compression technique/standard used in MPEG2 Transport Stream
on Nov 2, 2010 at 12:59:18 pm

[Syed Irfan] "I am trying hard to find what compression method is used in MPEG2-TS."

An MPEG2-TS (transport stream) is a container -- it doesn't specify the codec.

In practice, I've seen MPEG2 video (H. 262) and MPEG4 AVC (H. 264) wrapped in MPEG2-TS.

Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
RenderBreak Blog - What I'm thinking when my workstation's thinking
Creative Cow Forum Host: Live & Stage Events


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Ann Clark
Re: Compression technique/standard used in MPEG2 Transport Stream
on Nov 9, 2010 at 12:18:24 am

Hello,

I'm not sure I understand your discussion of codecs, here, but it seems like you're saying H.264 can be used to create a file with an MPEG2 extension?

Reason I ask is that I just got a request from a client that I'm not sure about.

We typically provide clients with a .MOV file of the production (a small, 30-60-sec file at 320x240 size) for posting on their website. Usually is 1-5MB. Occasionally, we do a WMV, of the same approx. size.

This client asks for the web video in MPEG2 format.

1.) Does MPEG2 compress down that small?

2.) Does anyone use MPEG2 to post to the web (other than sending it to a site like YouTube or Blip.TV, in which case what's the best Compressor setting for that?)

MacPro 2 x 2.8 GHz Quad-Core Intel Xeon 14GB memory - OSX10.6.4 FCP7


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Craig Seeman
Re: Compression technique/standard used in MPEG2 Transport Stream
on Nov 9, 2010 at 12:33:53 am

MPEG transport stream is a container format. It can contain MPEG2 as well as H.264 for example. It's often used for broadcast related delivery.

MPEG2 is not something one would use for web video so your client is misunderstanding something I suspect.

H.264 for web is often mov or mp4 but there are other various extensions such a f4v (specific to Flash but others work as well) and m4v (specific to iOS but is mp4 too).

There's also mpg which can be an MPEG Program Stream.

Container formats are not the same as codecs although there can be a close relationship in the name due to the specs.

MPEG for web yes. MPEG 4 Part 2 (older) which is often mov or .mp4 MPEG 4 Part 10 (H.264 aka AVC). which can be either .mov .mp4 for example as well as .m4v or .f4v (Flash only)
MPEG2 NOT for web use.



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Chris Blair
Re: Compression technique/standard used in MPEG2 Transport Stream
on Nov 9, 2010 at 1:42:55 am

They may want it for archive purposes or as an intermediate file to do further compression on. I don't believe you can do an MPEG2 file at sizes below 720x480. But yes you can wrap an H.264 file inside an MPEG2 wrapper. However it's typically used for broadcast distribution on HD content.

Chris Blair
Magnetic Image, Inc.
Evansville, IN
http://www.videomi.com
Read our blog http://www.videomi.com/blog


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Ann Clark
Re: Compression technique/standard used in MPEG2 Transport Stream
on Nov 9, 2010 at 9:43:48 pm

This is great info. It's possible they want a great intermediary for posting to sites, but given their webmaster's sophistication level, I'm guessing not. I do think the client is either misinformed, or wishes to have a broadcast-viable version so he can air or change it on his own. Since we provide editing and air time services, this would sort of take away from our possible future business with the client, so I'm thinking I should talk him into a WMV or other web video.

MacPro 2 x 2.8 GHz Quad-Core Intel Xeon 14GB memory - OSX10.6.4 FCP7


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