Difference between revisions of "MPEG"
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=== Muxers === | === Muxers === | ||
MPEG-2 specified 2 [[container]] formats, ts and ps. Containers hold video and audioinformation in them, and package them up so it can be sent over a network or stored on disk. | MPEG-2 specified 2 [[container]] formats, ts and ps. Containers hold video and audioinformation in them, and package them up so it can be sent over a network or stored on disk. | ||
| − | * '''ts''' should be used to store or send data where data loss will probably occur, such as over a network. | + | * '''ts''' (Transport Stream) should be used to store or send data where data loss will probably occur, such as over a network. |
| − | * '''ps''' should be used to store or send data where data loss is not likely, such as on a DVD. | + | * '''ps''' (Program Stream) should be used to store or send data where data loss is not likely, such as on a DVD. |
Both ps and ts can transport MPEG-4 Video, but only ts can send MPEG-4 Audio. In addition, MPEG-4 specifies it's own muxer, '''mp4''' (see [[#MPEG-4|below]]) | Both ps and ts can transport MPEG-4 Video, but only ts can send MPEG-4 Audio. In addition, MPEG-4 specifies it's own muxer, '''mp4''' (see [[#MPEG-4|below]]) | ||
Revision as of 22:34, 17 January 2006
MPEG refers to a set of standards created by the Moving Picture Experts Group. MPEG refers to several video, audio and container formats.
An MPEG file is a file using an MPEG container (these are called ts and ps, and also mp4 for MPEG-4).
Contents
Creating an MPEG File with VLC
To make an MPEG file, you need to:
- Pick a container (see below)
- Transcode the audio and video to formats able to be held in the container: in general this is the MPEG video and audio formats only. Check the compatibility information in the official documentation.
You can do this using the Wizard, or by running vlc from a command prompt
vlc file.avi --sout='#transcode{vcodec=mp2v, acodec=mpga}:std{access=file, mux=ps,url=file.mpg}'
MPEG-1 and 2
- Video codec: mp1v, mp2v
- Audio codec: mpga, mp2a, mp3
- Muxer: ts, ps
MPEG-1 is a video and audio compression format, used in Video CDs. It is compatible with a large number of software and hardware devices.
MPEG-2 is used in digital television and DVB. It is also used as the format for DVDs.
MPEG-1 Audio
MPEG-1 also contains several audio compression formats:
- mpga is MP1 or MPEG-1 (Part 3) Layer 1
- mp2a is MP2 or MPEG-1 (Part 3) Layer 2
- mp3 is MP3 or MPEG-1 (Part 3) Layer 3
Muxers
MPEG-2 specified 2 container formats, ts and ps. Containers hold video and audioinformation in them, and package them up so it can be sent over a network or stored on disk.
- ts (Transport Stream) should be used to store or send data where data loss will probably occur, such as over a network.
- ps (Program Stream) should be used to store or send data where data loss is not likely, such as on a DVD.
Both ps and ts can transport MPEG-4 Video, but only ts can send MPEG-4 Audio. In addition, MPEG-4 specifies it's own muxer, mp4 (see below)
MPEG-3
A largely unused audio and video compression format.
- Note that MP3 is actually MPEG-1 Layer 3.
MPEG-4
- Video codec: mp4v (m4v)
- Audio codec: mp4a (m4a) - this is AAC.
- Muxer: mp4
MPEG-4 is a flexible audio and video compression format. The format describes audio and video compression, with a container format for streaming across networks and saving to disk. It also contains optional extra features, including DRM and subtitles. These extra features are only included in software if needed.
