MPEG....duhhh!

Hi guys,
could someone please explain to me what MPEG is? Is it audio or video codec? I have heard of Mp3 or MPEG3 and thats an audio codec so are MPEG1, MPEG2 and MPEG4 audio codecs too? This is all really confusing. Are DVD's in MPEG format?

https://www.videohelp.com/glossary

Enjoy

http://www.chiariglione.org/mpeg/

MPEG-1 audio has different forms called "layers"(the number is the layer):
MP1 is the oldest and isn't used anymore.
MP2 is used for VCD,SVCD and DVD.
MP3 is used for audio and video(Divx/Xvid).

MPEG-1 video is used for VCD.(AKA m1v)
MPEG-2 video is used for SVCD and DVD. (AKA m2v)
MPEG-3 video was never developed: http://en.wikipedia.org/wiki/MPEG-3
MPEG-4 video is a container and can be AVI,WMV,QT,MOV,etc.

AVICodec can tell you what the video and audio properties are.

what are the file extension for mpeg audio and video? for examplee mpeg layer 3 has the extension mp3. what the file extensions for mpeg 1 video, mpeg 2 video and mpeg 4 video.

Originally Posted by MOVIEGEEK

MPEG-1 audio has different forms called "layers"(the number is the layer):
MP1 is the oldest and isn't used anymore.
MP2 is used for VCD,SVCD and DVD.
MP3 is used for audio and video(Divx/Xvid).

MPEG-1 video is used for VCD.(AKA m1v)
MPEG-2 video is used for SVCD and DVD. (AKA m2v)
MPEG-3 video was never developed: http://en.wikipedia.org/wiki/MPEG-3
MPEG-4 video is a container and can be AVI,WMV,QT,MOV,etc.

AVICodec can tell you what the video and audio properties are.

so theres an MPEG1 Audio and MPEG1 video???? Hasn't an MPEG2 audio format been developed? You say that MPEG1 video is used on VCD's then why is the extnsion of VCD files .DAT....and since you say that MPEG2 video is DVD video then why are the files .VOB? Is the video file differently encoded or is it just the file extrnsion that has changed? Whats the file extension for MPEG4?

Originally Posted by mridang_agarwal

what are the file extension for mpeg audio and video? for examplee mpeg layer 3 has the extension mp3. what the file extensions for mpeg 1 video, mpeg 2 video and mpeg 4 video.

Audio will have an ext. such as:MP2,MP3,AC3,DTS,WMA,MP4
Video has many including:M1V,M2V,MPG,AVI,WMV,MOV
When video and audio have been authored into a disc format(eg VCD,DVD-VIDEO) the ext. will be changed(ie M2V->VOB,M1V->DAT).

Originally Posted by lordsmurf

There is no such thing as "MPEG-1 audio" or "MPEG-2 audio"

It's simply "MPEG Layer II" (mp2) or "MPEG Layer III" (mp3)
They can be multiplexed with either MPEG video format (MPEG-1 and MPEG-2)

I know, I know, it's complex and doesn't make a lot of sense, just pretend it's high school and memorize what you can.

Lordsmurf, I'm surprised at you! Yes there is such a thing as MPEG-1 audio and MPEG-2 audio.

MPEG1 audio has 3 layers.
So does MPEG2 audio.

MPEG1 audio has a limited set of allowable bitrates and sample rates.
MPEG2 audio increased that set considerably (mainly on the low end-- <64kbps, <32kHz).
Otherwise they are identical, so you may often be treating them the same. However, it's good to know the difference, especially if you have a tool that accepts MPEG1, but not MPEG2.
They are cross-compabitle though, so you can make an MPEG1 audio file and have it play in a MPEG2 audio player, as well as making an MPEG2 audio file (but constrained within MPEG1 specs) and have it play in MPEG1 audio player.
There is also MPEG 2.5 audio (backwards-compatible Multichannel like in SVCD/DVD, and Non-backwards compatible MCh aka AAC).

Scott

MPeg2 is also the basis for most compressed tv broadcast today. This includes "digital cable", satellite up/down links, most dbs (MPeg4 is beginning), ATSC DTV (MPeg2 now, MPeg4 alternative in future). Also compressed tape formats HDV and IMX.

Fisrtly, sorry for replying after quite some - I was out of town. Hope this topic hasn't turned stale! My question is, if i rename i VOB file to M2V or I rename a DAT file to M1V, would it work?

Originally Posted by mridang_agarwal

Fisrtly, sorry for replying after quite some - I was out of town. Hope this topic hasn't turned stale! My question is, if i rename i VOB file to M2V or I rename a DAT file to M1V, would it work?

Work for what? Some software can handle VOB or DAT files, some can't. Whether you rename them or not.

Remember,

VOB is nearly the same as MPEG2 PS, but NOT exactly the same.

DAT is nearly the same as MPEG1 SS, but NOT exactly the same.

There are a number of good (and cheap) apps that will extract the MPEG2 PS from VOBs, and MPEG1 SS from DATs, and there is a very good reason for using them. Compatibility is much more assured that way.

Scott