On 11-09-15 05:57 AM, Ruediger Rolf wrote: > 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.
A single core would probably be insufficient for one stream. We average (depending on the settings) at 50% load on a dual core 2.5GHz for two video streams with mpeg2 last I checked. Switching to x264 brings that up even higher. A single core just isn't going to have the power to encode, unless you have it capturing at very low framerates and quality. G >> 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 >>>> >>>> >>>> >>>> _______________________________________________ >>>> Matterhorn-users mailing list >>>> [email protected] >>>> http://lists.opencastproject.org/mailman/listinfo/matterhorn-users >>>> >>> >> > >
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