[aklug] Re: FriLinux

No, actually I meant the USB interface coupled with the CPU's overhead
in attempting to transcode.

My laptop only has USB 1.1. I do have a cardbus adapter for USB 2, but
that does not appear to work as well as a USB 2 interface on the
motherboard of other computers. My Blue video/mic is supposedly capable
of HD. I suspect it's output buffer spends a lot of time in an overflow
condition because my laptop is not capable of retrieving the data
quickly enough.

Jim G

On Mon, 2010-11-22 at 14:19 -0900, Jeremy Austin wrote:
> On Mon, Nov 22, 2010 at 2:09 PM, Jim Gribbin <jimgribbin@gmail.com> wrote:
> > I've noticed there is a difference between recording a video stream and j=
> ust streaming it. If I just use Cheese to watch the output of my camera, I =
> seem to be able to set it at anything I want. I have also done Skype Video =
> on Linux using a P3x1GHz. Both seemed to work OK.
> >
> > I did attempt recording using VLC, but didn't get anywhere. I am thinking=
> now that my issues may have been available power more than failing to figu=
> re out the appropriate command line. I may attempt it again now that I have=
> access to a faster processor.
>
> You'd definitely want a P4 at least for most modern sizes, and forget
> about realtime h.264 unless you have at least a Core Duo. When I first
> started encoding, ahem, MPEG4 video on a PII or PIII, it used to take
> about 10x realtime!
>
> VLC can transcode and save to quite a few formats. I haven't tried it
> on linux, but it may be instructive to use the streaming/encoding
> wizard (on Windows? or maybe on both?) to see what command-line
> options it spits out. I've used that as a starting point before with
> good results.
>
> > My Blue Eyeball is advertised as being capable of up to 1600 x 1200 x 30f=
> ps, but I don't have an interface that will keep up.
>
> By interface, you mean disk interface?
>
> Uncompressed HD has high bandwidth requirements to disk. It's possible
> to play video from camera to screen much faster than most people can
> save it. I don't have a fast array for that, but I do have the cores
> to transcode using one or the other of the various wavelet encodings,
> saving enough disk bandwidth to be able to save 'practically lossless'
> video at HD resolutions. Hence encoding in realtime to MPEG4 with VLC,
> although that will be much lower quality.
>
> jermudgeon
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Received on Sat Nov 27 22:28:36 2010