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Old 09-16-2012, 08:37 AM   #1
ted_chou12
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Registered: Aug 2010
Location: Zhongli, Taoyuan
Distribution: slackware, windows, debian (armv4l GNU/Linux)
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bttv bt878 no audio


I have already got tuner card video working. I see the proper video but I can't get the audio working:
Code:
root:# dmesg | grep bt
[    4.791319] bttv: driver version 0.9.18 loaded
[    4.791326] bttv: using 8 buffers with 2080k (520 pages) each for capture
[    4.793288] bttv: Bt8xx card found (0).
[    4.793316] bttv 0000:01:04.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18
[    4.793332] bttv0: Bt878 (rev 17) at 0000:01:04.0, irq: 18, latency: 32, mmio
: 0xf0100000
[    4.793375] bttv0: subsystem: 107d:6f09 (UNKNOWN)
[    4.793385] bttv0: using: AVerMedia TVCapture 98 [card=13,insmod option]
[    4.793425] bttv0: gpio: en=00000000, out=00000000 in=003fffff [init]
[    4.795934] bttv0: Hauppauge/Voodoo msp34xx: reset line init [11]
[    4.829034] bttv0: Avermedia eeprom[0xffff]: tuner=Unknown type radio:yes rem
ote control:yes
[    4.829045] bttv0: tuner type=2
[    5.118182] bttv0: audio absent, no audio device found!
[    5.310976] bttv0: registered device video0
[    5.312494] bttv0: registered device vbi0
[    5.312520] bttv0: PLL: 28636363 => 35468950 .. ok
[    5.436297] input: bttv IR (card=13) as /devices/pci0000:00/0000:00:1e.0/0000
:01:04.0/rc/rc0/input7
[    5.436455] rc0: bttv IR (card=13) as /devices/pci0000:00/0000:00:1e.0/0000:0
1:04.0/rc/rc0
[  188.381437] bttv0: PLL can sleep, using XTAL (28636363).
[  542.991350] bt878: AUDIO driver version 0.0.0 loaded
[  739.708202] bt878: AUDIO driver version 0.0.0 loaded
I believe that the bttv module is the video and bt878 has the audio module.
This is the output when I launch mplayer with tv://
Code:
ted:$ ./tv.sh
MPlayer SVN-r32634-4.4.4 (C) 2000-2010 MPlayer Team
160 audio & 349 video codecs
Can't open joystick device /dev/input/js0: No such file or directory
Can't init input joystick

Playing tv://.
TV file format detected.
Selected driver: v4l2
 name: Video 4 Linux 2 input
 author: Martin Olschewski <olschewski@zpr.uni-koeln.de> 
comment: first try, more to come ;-)
Selected device: BT878 video (AVerMedia TVCaptur
 Tuner cap:
 Tuner rxs: MONO
 Capabilities:  video capture  video overlay  VBI capture device  tuner  read/write  streaming
 supported norms: 0 = NTSC; 1 = NTSC-M; 2 = NTSC-M-JP; 3 = NTSC-M-KR; 4 = PAL; 5 = PAL-BG; 6 = PAL-H; 7 = PAL-I; 8 = PAL-DK; 9 = PAL-M; 10 = PAL-N; 11 = PAL-Nc; 12 = PAL-60; 13 = SECAM; 14 = SECAM-B; 15 = SECAM-G; 16 = SECAM-H; 17 = SECAM-DK; 18 = SECAM-L; 19 = SECAM-Lc;
 inputs: 0 = Television; 1 = Composite1; 2 = S-Video;
 Current input: 0
 Current format: BGR24
v4l2: current audio mode is : MONO
Selected channel: 31 (freq: 265.250)
==========================================================================
Opening video decoder: [raw] RAW Uncompressed Video
Movie-Aspect is 1.78:1 - prescaling to correct movie aspect.
VO: [xv] 640x480 => 854x480 Packed YUY2 
Selected video codec: [rawyuy2] vfm: raw (RAW YUY2)
==========================================================================
Audio: no sound
Starting playback...
V:   0.0 141/141 ??% ??% ??,?% 0 0 
v4l2: 143 frames successfully processed, 9 frames dropped.

Exiting... (Quit)
here is lspci
Code:
01:04.0 Multimedia video controller: Brooktree Corporation Bt878 Video Capture (
rev 11)
01:04.1 Multimedia controller: Brooktree Corporation Bt878 Audio Capture (rev 11
)
And the code I use to launch mplayer:
Code:
TV="-tv driver=v4l2:device=/dev/video0:norm=NTSC:chanlist=us-cable:channel=31:outfmt=yuy2"
AUD="adevice=/dev/dsp:alsa=on:audiorate=44100:amode=0:forceaudio"
PIC="-hue 0 -contrast 0 -brightness 50 -saturation 0"
DASH="-ao alsa,oss -aspect 16:9"
mplayer tv:// $TV:$AUD:quality=100 $PIC $DASH
How can I get the audio working?

Thanks,
Ted
 
Old 09-16-2012, 03:39 PM   #2
ted_chou12
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Registered: Aug 2010
Location: Zhongli, Taoyuan
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I have got the pcm for bt878 to show up:
Code:
ted:$ cat /proc/asound/pcm
00-00: Intel ICH : Intel ICH5 : playback 1 : capture 1
00-01: Intel ICH - MIC ADC : Intel ICH5 - MIC ADC : capture 1
00-02: Intel ICH - MIC2 ADC : Intel ICH5 - MIC2 ADC : capture 1
00-03: Intel ICH - ADC2 : Intel ICH5 - ADC2 : capture 1
00-04: Intel ICH - IEC958 : Intel ICH5 - IEC958 : playback 1
01-00: Bt87x Digital : Bt87x Digital : capture 1
01-01: Bt87x Analog : Bt87x Analog : capture 1
server://root
ted:$ cat /proc/asound/cards
 0 [ICH5           ]: ICH4 - Intel ICH5
                      Intel ICH5 with ALC650F at irq 17
 1 [Bt878          ]: Bt87x - Brooktree Bt878
                      Brooktree Bt878 at 0xf0101000, irq 18
With this http://www.mythtv.org/wiki/Snd-bt87x but I still cant get the sound. I have tried testing:
Code:
root:# cat /dev/dsp1
€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€blah blahblah
€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€!!!!!!!!!
€€€€€€€€€€€€€€€€cat: /dev/dsp1: Input/output error
server:/~
server://root

ted:$ dd if=/dev/dsp1 of=/dev/null bs=128
dd: 霈€????dev/dsp1?? 頛詨/頛詨?航炊
2+0 records in
2+0 records out
256 bytes (256 B) copied, 10.0334 s, 0.0 kB/s
EDIT!
I am able to use
Code:
sox -r 32000 -t alsa hw:1,1 -t alsa hw:0,0
To capture I believe radio! But I am not able to adjust the channel, there is a fm input on the video card. At the moment the sound isn't crisp due to no extension plugged into the fm input.
Thanks,
Ted

Last edited by ted_chou12; 09-16-2012 at 06:52 PM.
 
Old 09-19-2012, 01:07 PM   #3
ted_chou12
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Registered: Aug 2010
Location: Zhongli, Taoyuan
Distribution: slackware, windows, debian (armv4l GNU/Linux)
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Original Poster
Blog Entries: 30

Rep: Reputation: 3
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