On Thu, 3 May 2001, Jon Pennington wrote:
> I understand what you're doing better, now. Yes, the DC10 is missing
> a tuner. Are you sure that MPEG-2 will provide you with a low enough
> data rate?
A lot lower than mjpeg. mjpeg is typically 5:1 or 8:1 for decent TV
quality. MPEG-2 DVD's are around 50:1.
> Actually, I may revert to part of my original suggestion,
> and recommend a Bt8x8 PCI card.
The problem is that you have to spend significant time compressing the
video, or you're writing 25MB/sec to disk. I also need to be able to
decode video and display it at the same time. And eventually, I want to
be able to put two tuner/capture cards in the machine to get multiple
channels, plus timeshift. This demands mjpeg at mimimum and preferrably
MPEG-2.
> Between V4L-2's improved, erm, rubustness, with these chips, and
> applications such as NuppleVideo (I think that's what it's called),
> MPEG-4 may or may not be a viable solution.
MPEG-4 is even heavier to compress than MPEG-2. As the questionable
benchmarks on Tom's Hardware show, you're lucky to get 30+ fps encoding on
a 1.3GHz Athlon.
> TiVo's use MPEG-4.
Not afaik. They use the same class of MPEG-2 chips that are found in the
eTV. MPEG-4 was only barely a standard and most certainly not available
in silicon form when the TiVo first came out. Maybe the latest&greatest
has some fresh-from-the-fab MPEG-4 codec chip, but I doubt it.
> What's line 21?
Where teletext and closed captioning live in the NTSC signal.
Erik Walthinsen <omega@xxxxxxxxxxxxxxxxxx> - System Administrator
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