Hi Stuart,
Thanks for the detailed reply.
What I do is:
1. Windows desktop: capture a screen with windows media encoder (screen
region set to 720x576) and stream this to a http port
2. Linux system: connect to the windows desktop machine with VLC and
transcode it to 720x576 mpeg2 stream. Also stream this on
a http port
3. MVPMC: connect via a playlist to the mpeg2 stream of the linux machine.
I see the shadows around the text.
When I connect with a pc running vlc to the stream from the linux machine is
nice and clear.
The shadows are also around the text of the menu. From this I made a photo,
and this is the picture I linked to in the first mail.
I've captured with mvpmc pressing the green button. It is a picture without
any shadows.
But it's unclear to me when this screen shot is generated. But it's probably
taken before the "TV signal generation logic" of the mvp.
The shadow appears on a normal tv as well as on a plasma tv (both connected
to different mvp's).
The scart cable is 2m long (the included one, as well as the goldplated,
with foil one)
You mention termination is bad, could you tell me what I can do about this?
Already many thanks.
Best regards,
Tim
On 1/10/07, stuart <[EMAIL PROTECTED]> wrote:
Hi Tim...
I don't mean to doubt you, but is this really a screen capture or a
picture taken with a camera of your TV? It just looks a lot like a
signal reflection from bad terminations or delayed response of some old
picture tube. Further, and I'll be the first to say I am not entirely
sure about this, MPEG encoding artifacts should be distributed *around*
objects. That is before, below, above & after a sudden change in the
encoded picture. Your image shows artifacts to the right of the
picture. If you did take the picture using a camera - try using the
green button on the MediaMVP's remote control while running just about
anything other than MClient. You will need to use the proper option on
the mvpmc command line (in your dongle configuration file) to indicate
where to save the screen capture. This method would eliminate any
problem with your video cable or TV. My guess is that your cables are
fine, but you have bad termination. If the impedance of the cable, the
source of the video and the destination of the video do not match - the
signal will bounce back and forth between the ends of the cable. The
longer the cable, the longer the delay and the artifact or "reflection"
of the images will appear further to the right (TVs scan from left to
right).
Given the above, let's see, SCART - so your picture is being refreshed
50 times/second. Horizontal scan is about 15KHz. There might have been
40 chars across the screen. The echo looks like 1/4 of that. About 30%
of the Horizontal scan is wasted in blank screen and synchronization
pulses. So [(1/15K)/[(1/.3)*40]]*(1/4)=125E-9 seconds. Light is
3E8m/s. So 3E8*125E-9=37meters. Hum, that sounds long. Are you using
a 37 meter SCART cable??? Well, there's a lot of guessing going on
here. For instance signals do not travel at the speed of light through
a cable - it slower - which would make the calculated cable length
shorter. And if these characters were smaller than I am guessing (like
say you could fit 80 across the screen) that would just about half the
calculated cable length.
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