Author: Anders Eriksson (195.67.124.229)
Date: 12-04-2002 17:25
> sound and video quality of VCD is not particularly good
The sound of VCD is very good, if you consider it's stereo, not 4-5-6 channels. It's MP2 compressed at 224kbit/sec, unhearable difference from an AudioCD for the most part of human ears.
VCD on Falcon is currently not possible. The video is MPEG1 (352x288x25fps PAL) and the audio mpeg 1 layer 2. The DSP depacks the MP2 fine. However, the CPU is chanceless to deal with the video by itself when the DSP is busy decoding audio.
So the other way around, MP2 on CPU and Video on DSP? Well first of all there isn't even enough bandwidth between CPU/DSP to shuffle the movie at 25 FPS (plus compressed stream to DSP), and it is very unlikely a 030 can decode the audio realtime in full quality.
I've made some tests on my CT2 Falcon, and with audio sounding fine, the video runs at 2 fps approx. Not exactly good.
I don't expect wonders with CT60 in this department, but perhaps it can bring up it a bit at least.
A friend of mine bought a little vcd-decoder which was hooked to the SCSI-chain. It would then use the computers CD-ROM to read VCD and play it on telly. If I'm not mistaken, he bought it at NAS'95 from an english reseller (16/32 systems?).
--
Anders Eriksson
support@atari.org
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