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How long does it take to do a Quicktime transcode to MPEG2 with the MediaPress board?

Views: 1599
Votes: 0
Posted: 01 Feb, 2008
by: Admin A.
Updated: 01 Feb, 2008
by: Admin A.
The MediaPress board can encode at realtime rates, because that is what is
required when doing a live encoding from external inputs. The Quicktime transcode
option uses the same hardware for encoding, but the problem is getting the video
data up to the MediaPress board in order for it to do the encoding. So the
transcode speed relies on how fast the computer can decompress the Quicktime
movie and send it up to the board.

On a 933MHz G4, it takes 4 to 1 for DV to MPEG transcode on OS 9 and MediaPress
2.4.7z.  On a 933MHz G4 with OS X, it takes 6 to 1 for DV to MPEG transcode.
On a dual 2GHz G5, it takes 4 to 1.

One thing to note is that this speed holds true regardless of the MPEG encoded
bitrate. In other words, a MPEG1 1mb/s transcode takes the same time as a MPEG2
9mb/s transcode. This is because the board is doing all the compression and it
operates quicker than the rest of the transcoding path.


Document: 10213
Created: 5/7/03
Modified: 8/5/04
Product: MediaPress
Version: 2.4.7z, MediaPress X 1.x
Mac OS: 9.x, 10.x
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