video capture help

[dexista]

I have recently bought one of these: http://www.ebuyer.com/UK/product/108219 (its basically a dongle that allows me to recieve freeview on my pc). It allows me to capture video, so i done a test and saved some of the snooker. I think 25 seconds of recording worked out to be 10MB. I looked under the options for capture, and can see two types of capture format MPEG2PS, MPEG2TS.
So i quickly read the manual and its says something about if you use other video source such as composite or s-video you can use divx. I already have divx on my machine, so why cant i use the divx codec and sensible file sizes?

The software is called dvb plus, dtvr.

Thanks.

[jagabo]

I believe that device captures the FTA MPEG stream and saves it to a file, giving you the choice of a transport stream or a program stream. You probably have to capture first, then encode with Divx later.

[edDV]

The MPeg2_TS (or PS) is a compressed stream as broadcast. You are just capturing the MPeg2 stream to disk. This doesn't load the machine excessively and can proceed real time. Recompressing the MPeg stream will be a long non-realtime process.

The main load placed on the CPU during capture is decompressing the MPeg for preview at low quality.

It doesn't appear that this device offers any internal compression for external inputs so it may be limited to CIF 352x288. External inputs put all the compression load on the CPU.