Hi Paul,
> > The SCR value increases with each incoming isochronous packet, so it's
> > not constant across a video frame.
>
> You are right, but this is the only field having device SOF counter value.
> It is needed to establish correspondence between device internal clock
> (STC) and device SOF
Hi Laurent,
> The SCR value increases with each incoming isochronous packet, so it's not
> constant across a video frame.
You are right, but this is the only field having device SOF counter value. It
is needed to establish correspondence between device internal clock (STC) and
device SOF count
Hi Paul,
> This is a great news - it means that stereo system should be easy to do.
> Most likely cause for synchronized (I assume you mean the same values)
> device SOF counters in two Logitech cameras is them being synchronized with
> host SOF counter.
That's what I assumed, yes. I doubt the
Hi Laurent,
This is a great news - it means that stereo system should be easy to do. Most
likely cause for synchronized (I assume you mean the same values) device SOF
counters in two Logitech cameras is them being synchronized with host SOF
counter. Can you compare values in device SOF counte
Hi Paul,
> as much as I would like to see cheap USB webcam based stereo vision, I
> have to agree with you that adherence to standard is crucial. In general
> case we have to assume different values in device and host SOF counters. Do
> you have means (bus analyzer) to test some UVC cameras to fin
Message
From: Laurent Pinchart <[EMAIL PROTECTED]>
To: Paul Jurczak <[EMAIL PROTECTED]>
Cc: linux-uvc-devel@lists.berlios.de
Sent: Monday, March 5, 2007 3:28:18 AM
Subject: Re: [Linux-uvc-devel] The source clock
Hi Paul,
> I see two fields in v4l2_buffer, which are used for time s
Hi Paulo,
> > [...]
> > I tested various webcams. One of them didn't include the PTS and SCR
> > fields in any packet. All others did.
>
> Since we're on the subject of frame clocks, I tested a Quickcam Ultra
> Vision and used gettimeofday to stamp each frame as it arrived.
>
> It seems that the f
Laurent Pinchart wrote:
> [...]
> I tested various webcams. One of them didn't include the PTS and SCR fields
> in
> any packet. All others did.
Since we're on the subject of frame clocks, I tested a Quickcam Ultra
Vision and used gettimeofday to stamp each frame as it arrived.
It seems that t
Hi Paul,
> I see two fields in v4l2_buffer, which are used for time stamps: timecode
> and timestamp. The timecode field lacks sufficient resolution for our
> purpose, because it was designed with analog video standards in mind.
> Besides, it seems that something similar to timecode is already bei
Hi Paul,
> Is there a clock on UVC cameras to get Presentation Time Stamp and Source
> Clock Reference, or these values are created by the driver on the PC? My
> understanding of the UVC specification supports the internal camera clock
> theory, which would be great for synchronization of 2 (or m
Hello,
Is there a clock on UVC cameras to get Presentation Time Stamp and Source Clock
Reference, or these values are created by the driver on the PC? My
understanding of the UVC specification supports the internal camera clock
theory, which would be great for synchronization of 2 (or more) ca
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