[mythtv-users] HDMI capture card with linux drivers

[George Galt]

> The first thing you would need would be a LOT of storage. I think this device
> creates uncompressed video, difficult to deal with in a Myth type system.
> Compressing it on the fly in software would require a LOT of computing grunt.
>
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Seems like it may have some form of hardware compression, though it's
not clear.  The site says:

On Windows, Blackmagic's full resolution (1920 x 1080) professional
quality compressed HD codec can capture JPEG AVI files in real time
using Premiere Pro. Unlike HDV and DVCPRO HD which uses reduced
resolution 1440 x 1080 video, Blackmagic's Online JPEG maintains the
full resolution 1920 x 1080 resolution of HD video without the huge
file size of uncompressed HD video. Blackmagic's Online JPEG is so
efficient that full motion 1080i HD video can be recorded at only 12
MB per second vs. a massive 119 MB per second for uncompressed HD
video.

Blackmagic's compressed files are so compact, that 1080 HD video can
be captured to a single internal hard disk or easily transported on a
portable Firewire drive! Online JPEG is compatible with Premiere Pro
and After Effects® and can even be used by editors without Blackmagic
capture cards making it one of the most versatile compressed codecs
available.



Words that seem problematic are "Blackmagic's full resolution (1920 x
1080) professional quality compressed HD codec ", which I assume is
proprietary and closed -- though I will note that one of their devices
lists Linux as a compatible OS.

This doesn't mean that there isn't a host of other issues with this
device, but at least it seems like it is doing some form of hardware
compression (though 12MB per second (sic) doesn't seem all that
great).

George