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" > > > > > 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
