On Sat, Oct 29, 2005 at 01:46:52AM -0400, Andrew wrote: > On Sat, Oct 29, 2005 at 05:03:56AM +0000, Duncan Webb wrote: > > Andrew wrote: > > > > >Sorry, i've asked before, but no answer > > > > > >I'm getting monaural sound when capturing with "cat /dev/video", and also > > >with "cat /dev/video24" > > >
I'm sorry. I just realized something. My mono problem occurs only when I use channel 3, the through-put channel, and feed a pre-processed (pre-selected) cable signal (one where the channel has been selected by the cable box) I am using the throughput because i can't select channels beyond 125, directly from ivtv, so I need the preprocessed signal for higher channels. Or did I miss something in this regard? At any rate, when I feed an "unprocessed" UHF signal directly into my PVR350 and tune into a particular channel, i /do/ get stereo. Any way to get stereo with channel 3 throughput as well? tia andrew > > > > > How do you know that you're getting mono? Maybe a stupid question but it > > could be your sound card settings or even the tv channel if your > > listening to the output. I did this test > > cat /dev/video24 > test.wav > > ... ^C > > aplay test.wav > > Playing raw data 'test.wav' : Unsigned 8 bit, Rate 8000 Hz, Mono > > thanks, this leads to more clues: > > I know it's mono only by hearing it. > > aplay thinks it is stereo, and, technically it may be, but both channels have > identical audio (although the volume levels are different between the two > channels), so, in effect, it is mono listening. > > _______ > Playing raw data './test.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, > Stereo > ------- > > same result when playing directly from the device: > ]# aplay -f dat /dev/video24 > Playing raw data '/dev/video24' : Signed 16 bit Little Endian, Rate 48000 Hz, > Stereo > > (but, once again, the above yields monaural sound) > > And I am sure the source is stereo, because i redundantly feed my tv audio > out into my PC's line-in, and listening to it /that way/ i hear stereo. And > sox recordings of the line-in feed are stereophonic. > > The hauppauge capture is via UHF cable from the same tv (cable box) > > > Then I did: > > ivtvctl --list-codec-params > > which returned: > > Segmentation fault > > and a nice Oops message in dmesg. > > ]# ivtvctl --list-codec-params > ioctl IVTV_IOC_G_CODEC ok > Codec parameters > aspect : 2 > audio : 0x00e9 > bframes : 3 > bitrate_mode: 0 > bitrate : 8000000 > bitrate_peak: 9600000 > dnr_mode : 0 > dnr_spatial : 0 > dnr_temporal: 8 > dnr_type : 0 > framerate : 0 > framespergop: 15 > gop_closure : 1 > pulldown : 0 > stream_type : 14 > > > thanks > andrew > > > _______________________________________________ > ivtv-devel mailing list > [email protected] > http://ivtvdriver.org/mailman/listinfo/ivtv-devel -- _______________________________________________ ivtv-devel mailing list [email protected] http://ivtvdriver.org/mailman/listinfo/ivtv-devel
