Hi again!
Am 15.09.2011 12:32, schrieb stefan braun:
Hi Rüdiger
Am Donnerstag, den 15.09.2011, 12:20 +0200 schrieb Ruediger Rolf:
Hi Stefan,
I guess your computer is simply too slow. you have a 2.2 Ghz single or
dual core processor?
yes, single core cup.
Could be enough for a single stream.
Have you check how the CPU load is during recording?
cpu load is on 100%.
This should not exceed 90% otherwise you will always loose frames and sync.
With firewire you will gt quite a lot data that needs to be encoded.
TV-cards are much more CPU friendly in my experience. The Hauppauge card
even do hardware compression.
What version of Matterhorn do you use?
version 1.1.
There were quite some fixes that
improved performance since version 1.1. The confidence monitoring patch
in trunk since last week will give an additional performance boost if
you are using epiphan vga2usb devices.
Why don't you try to use the Firewire input as an Audio input too? Then
you will have at least one device less to capture from and audio and
video will probably stay in better sync.
Rüdiger
So you recommend me to use a stronger pc or/and two switch to matterhorn
1.2.
A single core with 2,2 Ghz will not be enough for a two stream recording
with 1.2 I would guess.
Thanks
stefan
Am 15.09.2011 12:07, schrieb stefan braun:
Dear Community
The recording on my CA is working pretty fine: VGA grab, DV camera and
ALSA audio everything ok. But when I watch the video it is lagging: The
first three seconds look good, like a fluid film should looking like.
After this time, the video is frozen, then it follows a short fluid
phase again ... and so on. The same with the VGA grab video. The audio
file is ok, it has constant speed.
The CA has an 2.2 Ghz CPU and 8 GB RAM, but in the install-script I
allowed only 2 GB for matterhorn to use. Where can I increment the
memory use for matterhorn?
Here are my device specifications of the CA config file (I set the
buffer size quite high, I hoped it will help but it didn't):
# name definition??
capture.device.names=ALSA,DV_1394,VGA
#Create the screen capture
capture.device.VGA.type=EPIPHAN_VGA2USB
capture.device.VGA.flavor=presentation/source
capture.device.VGA.outputfile=VGA.mpg
capture.device.VGA.src=/dev/video0
capture.device.VGA.framerate=15
#create dv_capture
capture.device.DV_1394.type=DV_1394
capture.device.DV_1394.outputfile=dv_1394.mpg
capture.device.DV_1394.flavor=presenter/source
capture.device.DV_1394.src=/dev/video0
capture.device.DV_1394.codec=ffenc_mpeg2video
capture.device.DV_1394.codec.bitrate=2000000
capture.device.DV_1394.framerate=25
capture.device.DV_1394.buffer.size=1000
#Create the audio capture
capture.device.ALSA.type=ALSASRC
capture.device.ALSA.flavor=presenter/source
capture.device.ALSA.outputfile=Alsa.mp3
Do you have any recommendations for a good/working device specification
to solve my "lagging" problem?
Thanks for your answers
stefan
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--
________________________________________________
Rüdiger Rolf, M.A.
Universität Osnabrück - Zentrum virtUOS
Heger-Tor-Wall 12, 49069 Osnabrück
Telefon: (0541) 969-6511 - Fax: (0541) 969-16511
E-Mail: [email protected]
Internet: www.virtuos.uni-osnabrueck.de
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