[mythtv-users] Using MythTV as a non-TV recording device
kichigai at comcast.net
Fri Dec 23 03:44:13 EST 2005
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On Dec 21, 2005, at 21.46, Ryan Green wrote:
> The place of my employment currently has a setup where presentations
> are shot with a camera, and then currently recorded onto a VCR, and
> then captured from that tape onto a Computer for DVD. Currently, this
> takes us too much time and effort, and we'd like to go directly from
> camera to MPEG-2, and then record that with external software (doesn't
> have to be on the mythbox). We have a Hauppage PVR-250 which has an
> mpeg-2 encoder lying around, so we're thinking of dropping that into a
> box along with mythtv. Then, the files would be accessed over the
> local network for burning with Adobe Premiere.
As some one who has worked with video editing before, let me tell you
this is a bad idea.
First, MythTV was intended to record stuff from TV. If you're doing
this in Linux, just go cat /dev/video0 >file.ts and you'll save
yourself a lot of effort.
Second, editing videos in MPEG-2 is never a good idea. In video
processing, having to decompress MPEG-2 is just not something you
have the economy to do, unless you have multiple gigabytes of RAM and
a Godly amount of processing power.
Third, editing with MPEG-2 means loss of quality. You lose quality on
the first encoding, then you lose more quality on the second encoding.
Fourth, you don't want to store this on the network. At least, not
for video editing. A 300 GB Maxtor hard disk at the local Office Max
is going for $99. I'd plunk down the $99 for that hard disk.
If you're going to be serious about this, spend the money on a DV
cam, and a good hard disk. I've produced a fair number of videos
before. Early on, I was working from MPEG-1 and MPEG-2 sources, and
later I moved to DV. The difference in both quality and processing
speed was night and day.
> I'm not going to be recording TV with this at all, just programming a
> record button onto our AMX system and hooking it up to the computers
> serial port. How should I go around this? Is mythtv even the right
Well, like I said, an easier way to do this (if you are still going
to go about using MPEG-2 as your capture medium) is just to go cat /
dev/video0 >file.ts and avoid the whole overkill project of
"I said I was smart, I never said I was mature."
- --Ivan Kowalenko
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