On 30/08/14 16:17, Gene Heskett wrote:
On Friday 29 August 2014 03:21:27 Kaza Kore did opine
And Gene did reply:
From: gheskett@xxxxxxxx
To: linux-audio-user@xxxxxxxxxxxxxxxxxxxx
Date: Thu, 28 Aug 2014 22:45:41 -0400
Subject: Re: Successor/replacement for RME HDSP+Multiface?
On Thursday 28 August 2014 21:14:48 Kaza Kore did opine
And Gene did reply:
From: gheskett@xxxxxxxx
To: linux-audio-user@xxxxxxxxxxxxxxxxxxxx
Date: Thu, 28 Aug 2014 20:37:53 -0400
Subject: Re: Successor/replacement for RME HDSP+Multiface?
...Hi-8 tape...
I thought we were talking about the future here! The 80s wants its
property back!!
Also Hi8 is an analogue format so everything in the post is plain
bollocks! Maybe you meant Digital8?? Still 15 years old and any
tape format is pretty much dead and definitely not the future!
Not this one, it uses metal tape in the same casette as a Hi-8 would
use, but about a tenner more expensive. and is "digital Hi-8"
format.
Reasonably sharp too at 720p. Go look it up, its a Sony HandyCam
DCR- TRV460 NTSC. and about 11 years old IIRC.
So not Hi8 then! :p (If you look I did mention Digital8 too.) Not sure
where you get the idea it's 720P capable! Specs on website state
640x480 and you even state in the name you provided it's NTSC, which
is never 720P, same as PAL and SECAM aren't. They are old, SD
standards. 720/1080 P/I are very different beasts really.
Anyway it's probably more important to talk about the standardised DV25
and DV50 protocol all these commercial/prosumer products use for
communication that tape/card formats. There are some Sony and
Panasonic camera that do this fine over USB so it's not impossible or
a problem with USB itself. I see yours (and apparently many others)
claim to have some kind of USB Streaming but for some reason it's not
usually full quality, as you would get from Firewire. Wonder why...
The std says the speed is there. But on this Asus M2N-SLI Deluxe
motherboard that cost $287 USD when I bought it, all USB ports claim to be
USB2.0. The throughput to/from a hard drive in a self powered usb box
that I have 2 of, one 40Gb, one 300Gb drive, has a hard time out running a
floppy disk. No mistakes ever, but the usable bandwidth simply is not
there. My next door neighbor bought one of the 40's the same day I bought
mine, runs it as a backup on her windows machines. On her windows boxes,
it has no problem moving data in either direction at about 50 megabytes a
second.
A 640x480 USB2.0 camera, plugged into the rear port of a D525MW Atom
powered board, only make 3 frames a second.
The linux version of USB is a 1 legged dog in comparison. Why we put up
with that poor usb performance is beyond me. We had the original USB in
full usage on linux a good year ahead of the Redmond version, but IMSNHO,
linux has been sitting on its butt for at least a decade.
What the bloody hell, a copy of the std reference is well within the
financial reach of both Red Hat and Ubuntu & even SuSe. But I don't see
any improvements in the speeds here, and I am currently running a 3.16.0
kernel on a quad core phenom.
Cheers, Gene Heskett
Which is well more than enough for full bandwidth transfer of many video
channels from a DV type device (which are very similar to your
Digital8.) They use DV25, which is 25Mbit/s, or there was the DVCPRO50
at 50Mbit/s and DVCHD which uses 100Mbit/s. The tape storage media
stores it at these compression rates so there is no way to get better
quality from them!
The specs of your camera specifically say that the USB is for WebCam
output though! So I'm not surprised to head it's lower quality and
framerate. I just don't understand why!
Sony and Panasonic have both implemented it on a very low number of
their camcorders and as far as I know it works fine. But they require
special, propriety software so not really any use for the FLOSS world! I
honestly don't understand why there isn't a more widespread solution,
especially as firewire seems so hard to get these days, but answers of
the type "USB isn't up to it" don't bear up to the facts in my opinion.
Dale.
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