[linux-dvb] ADS PTV 305 sound issues

hermann pitton hermann-pitton at arcor.de
Tue Nov 20 23:09:50 CET 2007


Hi, M A!

you might be better off on the video4linux-list to meet people with such
cards.

Am Montag, den 19.11.2007, 20:57 -0800 schrieb M A:
> I have a fedora 5 box running fedora 5 (kernel  2.6.18-1.2257.fc5) and mythtv.
> I recently got a ADS PTV 305 tv tuner card (as part of ADS MCE 3000 media kit) which I installed on my computer.
> I am able to get the picture (there is a crossweave like patter though) but no sound.
> So my questions are :
> 
> 1) I can not get sound working on it 
> - Do I need to attach a audio cable from some jumper to motherboard (I have 
> onboard audio). ? Will 'cd in' port work or I need to install a separate sound 
> card which has 'aux in'. I tried v4l2-ctl -d 1 
> -f 61.25 --set-ctrl=mute=0 command but still can't get the sound (without 
> cable).

We have reports that analog sound works connected from J3 on the board.
If to CD-in or AUX-in doesn't make a difference, except for the mixer
controls.

However, cx88-alsa is supported too.

> 2) Any way to get better picture ? This card is supposed to have hardware encoding (??) but my cpu usage (1.6Ghz intel with 512 MB RAM) is about 50% when watching live TV. Most of it is from mythbackend. Is it actually using hardware encoding ?

Better picture, this goes on since years, but to adjust the minor controls is all.

On analog video, which has by far the highest throughput, it depends on
formats, size, deinterlacing etc. You have to know what you are doing.

The mpeg encoder needs firmware.

If you start a simple TV app on /dev/video0 and then "cat /dev/video1 >
my_high_load_;).mpg, you should see the difference.

The 2.6.18 was a good kernel, but you might consider to come a little
bit up, the guys have been working on it. If trying to use the v4l-dvb
master mercurial, take Mike's current warnings into account for that
tuner.

The radio likely doesn't work yet, can't tell for the other analog
inputs offhand.

Hermann

> 
> Here is my dmesg output
> 
> 
> [root at marut ~]# dmesg | grep cx
> cx2388x alsa driver version 0.0.6 loaded
> CORE cx88[0]: subsystem: 1421:0305, board: KWorld HardwareMpegTV XPert [card=45,insmod option]
> cx2388x v4l2 driver version 0.0.6 loaded
> cx88[0]/1: CX88x/0: ALSA support for cx2388x boards
> cx88[0]/0: found at 0000:02:0a.0, rev: 5, irq: 177, latency: 32, mmio: 0xdc000000
> tuner 1-004b: chip found @ 0x96 (cx88[0])
> cx88[0]/0: registered device video0 [v4l2]
> cx88[0]/0: registered device vbi0
> cx88[0]/0: registered device radio0
> cx2388x blackbird driver version 0.0.6 loaded
> cx88[0]/2: found at 0000:02:0a.2, rev: 5, irq: 177, latency: 32, mmio: 0xde000000
> cx88[0]/2: cx23416 based mpeg encoder (blackbird reference design)
> cx88[0]/2: registered device video1 [mpeg]
> cx2388x dvb driver version 0.0.6 loaded
> 
> 
> 
> [root at marut ~]# dmesg | grep tuner
> TV tuner 54 at 0x1fe, Radio tuner -1 at 0x1fe
> tuner 1-004b: chip found @ 0x96 (cx88[0])
> tuner 1-004b: setting tuner address to 61
> tuner 1-004b: type set to tda8290+75
> 
> 
> 
> Can anyone help ? Will really appreciate any help/pointer.
> 
> Regards
> M A
> 





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