10 hours 41 minutes
this module, we're gonna talk about audio video standards.
main standard right now for audio and video is called MPEG stands from Moving pictures. Expert group
has made different kinds of many portions to it. There are different compression standards or related to the video file an audio file.
Specifically, we're gonna talk about 1247 and 21
so I'll take one
more using coverage Video an MP three
and be three is very common right now for audio's audio files.
Well, the video quality wasn't that good was 3 52 by 2 40 resolution, which means you got the quality of
basically a VCR tape
when doing video it with this. But the MP three quality was a lot better, and it's still considered a standard
impact to compress two hours worth of videos into a couple of gigabytes. This is the compression technology that's used on DVD drives
when you're doing video. So basically your DVD drive appliance is doing the decompression. So once we read it and turn it back into ones and zeroes off the pits on the CD, then we're going to decompress those ones and zeros
to turn into a video file. Now this could support
up to 7 20 by 4 80 resolutions
and 12 12 80 by 7 20 at 60 but the most common was a 7 20 by 4 80 If you're coming with video formats, that 7 20 i,
which is pretty good picture quality
and then the audio that was stored with it was CD quality,
it's a really good audio,
but audio takes a lot less to compress. The video does videos a lot.
There's a lot more to it.
MPEG four is what was used to compress videos to fit onto Blue Ray discs.
Incorporated the Impact one and two standard and quick time technology. QuickTime is a audio video technology created by
used on their iPod and
and we use this to create the high quality video we get on Blue Ray.
And Peg seven isn't a actual way of compressing video. It's a standard for how to tag our video and audio. We call this metadata, so when we have a video file, there's more Thio video than just the video. We need to know
we don't need to, but it's very convenient to know the name of the video the length of the video
who made the video? You can store things such as the PG rating,
so those kind of things were defined by the MPEG seven standards, not actual video
An MPEG 21 is secure Digital Media from illegal file Sharing This is used in blue rays, and this is how they're doing their digital rights management.
So it's a way of protecting from recording video. So it checks.
The sends a signal over your cable between the blurry device and TV that check that they're both legit and there's nobody trying to record in between.
And that's a way of stopping. Recording a video on Blue Ray,
stop file sharing
or stealing videos.
We're talking about sound on the actual PC.
There's two standards. The 18 97 which is, ah, lower end audio devices. It does your basic stereo.
Most Your basic motherboard Sound College will be 80 97 based.
And then there's high definition audio, which supports up to eight channel so you can do full surround sound,
and the standard was created by Intel.
So those are states of looking at those air two things to look at. You're looking at
when you're buying a PC or picking out a motherboard is what kind of sound card were kind of sound to support on it you don't need. If you don't have high sound requirements,
18 97 will be sufficient, but your plan to use it as a home theater. You wanna play your computer in to a surround sound system than you want, make sure it's
supports high definition audio.