[dba-Tech] A few questions about media files

Thank you Erwin -- I'm glad I asked -- that's really helpful. 

Susan H. 


> It's not recommended to convert video to another format, it's very time
> consuming and you will loose quality because you convert from one lossy
> compression to another. But of course it depends on your personal needs
> and quality standards.
> 
> A Gif file is a 256 color (maximum) color picture.
> A animated GIF is a sequence of GIF pictures, each picture (frame) has a
> specific time to show.
> So U you have for example 3 frames; Frame 1 displays 0.5 seconds, frame
> 2 shows 1 second and frame 3 show 0.1 second and it starts over again.
> This technique is very efficient for animated pictures and low bandwith.
> A lot of internet banners are in animated GIF.
> Another advantage is that the background color can be transparent so it
> blends in a website.
> 
> AVI and MPG/MPG are video formats having a constant frame rate per
> second. For internet usually 15 frames a second. DV and DVD has 25
> frames a seconds, PAL 29,97 frames (or something) seconds, NTSC 30 I
> believe.
> 
> AVI and MPG/MPEG these files can be compressed with different codecs. So
> its possible that one MPG files plays normaly, another does not show any
> image or sound because your computer does not have the appropriate
> codec.
> 
> Codec = coder/decoder
> 
> Erwin
> 
> 
> 
> 
> 
> 
> 
> -----Original Message-----
> From: dba-tech-bounces at databaseadvisors.com
> [mailto:dba-tech-bounces at databaseadvisors.com] On Behalf Of Susan
> Harkins
> Sent: Friday, February 15, 2008 4:25 PM
> To: DBA Tech List
> Subject: [dba-Tech] A few questions about media files
> 
> I have a couple of quick questions about media files -- I can look these
> up later, but I thought I'd ask incase someone knows off the top of
> their heads -- would save me some research time. 
> 
> 1.) Do MPEG, AVI, and GIF files support both sounds and video? 
> 
> 2.) Can you convert a media file to another format? If so, can you
> recommend a product?
> 
> Susan H. 
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