DVD shrink mpeg(re)encoder

[THUKIS]

Hi guys . i am using dvdshrink 3 and i was wondering which mpeg encoder does it use a 256kb software . is it use tmpeg which is installed in my pc ? or anything else ? isn't there a way to choose ?
sorry if it's stupid question :confused:

[Kedirekin]

None of the above.

DVDShrink uses an internal transcoding engine, not a full encoder. Transcoders are relatively new on the scene, and their size and speed is amazing.

[THUKIS]

ok . i get it now . thanx man

[zande]

Can someone explain how a transcoders is so different from an encoder.

If you re-encode let's say a picture stream, an encoder first have to decompress the stream, then compress it again using the new settings.

But I suppose the transcoders work in a different way!?!?!?????
Can the transcoder strip out certain information from the original stream without decompress it first?

Very curious....

[Kedirekin]

I'm sure different transcoders work in different ways.

One thing I think they have in common is they only partially decompress the stream. For example, they might undo the huffman (I think that's right) compression, but leave it in the discrete cosine tranform compressed domain (i.e. not perform IDCT).

Another thing I think the transcoders (at least the ones we use) have in common is that they don't change motion vectors.

Motion analyses and discrete cosine transform are two of the more time consuming processes in encoding a movie (motion analysis much more so than DCT). By avoiding these steps, transcoders save a lot of time.

[int 21h]

Uh... http://forum.doom9.org/showthread.php?s=&threadid=63587

[Kedirekin]

Ummm, I may have over simplified. ;)