How is a video frame represented?

[pablowablo]

Hmmm I apologize if this isn't totally about mpeg4.

Is there a raw form for videos? Like for audio, there is PCM which is the digital approximation of the analog signal. How about for videos? Like, what is the final output of the decompression stage, regardless of file format. How are the pictures represented, and displayed? (programming wise) For audio you just play the raw format...

Hope you guys have the answer. Thanks!

[flaninacupboard]

older media players used 24bit RGB as the ouput, that soon adds up to a LOT of data. these days the video is a YUV overlay handled in hardware by the grpahics card, so it's probably not as simple as you'd hoped

[Ufit]

Raw form is just uncompressed image. 24bit RGB or
24bit RGB+8bit alpha = 32bit RGBA. YUV is used for TV
other words Y,Cb,Cr Luminance(Y),Chrominance(Cb,Cr) 4:2:0
4:2:2,4:4:4. YUV is basicaly 16bit but u can use coefficients to
convert to RGB and because they are real numbers there can be more than 16bits of colors after conversion to RGB.
Image is represented usually as a bitmap structure BITMAPINFO
or class CBitmap(C++ talking).
It's simple but u have to read a little about it.

[pablowablo]

Thank you very much! I have encountered RGB and YUV before but I was not sure of their difference and if they really are the raw form... Thanks