Date: Sun, 14 Feb 2010 15:12:03 +0100 From: Jan Henrik Sylvester <me@janh.de> To: Hans Petter Selasky <hselasky@c2i.net> Cc: multimedia-list freebsd <freebsd-multimedia@freebsd.org> Subject: Re: DVB-T with Cuse4BSD: bad signal quality Message-ID: <4B7804B3.4000903@janh.de> In-Reply-To: <201002141444.13674.hselasky@c2i.net> References: <4B77FC79.5040106@janh.de> <201002141444.13674.hselasky@c2i.net>
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On 02/14/2010 14:44, Hans Petter Selasky wrote: > On Sunday 14 February 2010 14:36:57 Jan Henrik Sylvester wrote: >> After I tried video4bsd last weekend for the first time and was able to >> make my webcam work, but not my DVB-T device. This weekend, I found >> Cuse4BSD on your homepage replacing video4bsd. >> >> Now my DVB-T stick basically work. Thanks a lot for all your effort! >> >> I wanted to complain about the firmware path being /, but since you >> added the '-f' switch that comes down to the rather unimportant default >> being / and not -- for example -- /boot/modules/. Having to call webcamd >> twice, once to load the firmware and once to actually do its job is a >> little counter intuitive. >> >> My major problem at the moment is the quality of the signal. That has >> always been dependent on the location of the antenna in my apartment, >> but I just tried Raaf's dvbusb driver under FreeBSD 7 without having any >> distortions and immediately booted back into FreeBSD 8: The distortions >> are so high that it is unwatchable and after a few seconds audio and >> video are out of sync using Raaf's typhony (Kaffeine seems a little >> better at keeping the streams at sync even with a bad signal). >> >> I already checked the system load on my atom based system: 15% user, 10% >> system, 70% idle (8% python, 8% mplayer, 4% webcamd) or 15% user, 20% >> system, 60% idle (20% kaffeine, 7% webcamd, 5% Xorg) -- that does not >> seem problematic. (I thought with the driver now partially in user space >> there might be higher load than before due to context switching.) >> >> I am currently on FreeBSD 8.0-RELEASE with the libusb patch you >> advertised last week on your homepage. I would not like to bring my atom >> based system to 8-STABLE or 9-CURRENT. Would that help? >> >> Any idea or fix for my distortions? > > It might be that the Linux driver is setting up to small buffers. I have some > patches for some of the V4L drivers, but not all. What is the VID+PID of your > device? > > usbconfig -u X -a Y dump_device_desc ugen4.4: <Digital TV Receiver Digital TV Receiver> at usbus4, cfg=0 md=HOST spd=HIGH (480Mbps) pwr=ON bLength = 0x0012 bDescriptorType = 0x0001 bcdUSB = 0x0200 bDeviceClass = 0x0000 bDeviceSubClass = 0x0000 bDeviceProtocol = 0x0000 bMaxPacketSize0 = 0x0040 idVendor = 0x14aa idProduct = 0x0226 bcdDevice = 0x0521 iManufacturer = 0x0001 <Digital TV Receiver> iProduct = 0x0002 <Digital TV Receiver> iSerialNumber = 0x0003 <20060503> bNumConfigurations = 0x0001 (I will not be able to answer anymore for a few hours.) Cheers, Jan Henrik
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