em28xx: Terratec Grabby no sound

 Hi,

 I recently bought a Terratec Grabby. The device has a S-Video and 3 
 Cinch
 cables (sound left, sound right, video). I want to record some video
 cassettes with it. (with a cinch-scart adapter).

 I checked the signal, there is audio and video on it.

 When I try to "play" the capture device with e.g. mplayer, I see "no
 sound", even with various options.

 I can hear sound only by doing "arecord -D hw:2,0 -r 32000 -c 2 -f 
 S16_LE |
 aplay -", but as soon as mplayer is starting, I can't hear anything
 anymore.

 ...which means that using alsa as the sound device with mplayer doesn't
 work either.

 Am I missing something?

 I checked the source code, Terratec Grabby support was introduced with
 4557af9c5338605c85fe54f5ebba3d4b14a60ab8:

 -----------------------------------------
 diff --git a/drivers/media/video/em28xx/em28xx-cards.c 
 b/drivers/media/video/em28xx/em28xx-cards.c
 index 7cb93fb..b4c78f2 100644
 --- a/drivers/media/video/em28xx/em28xx-cards.c
 +++ b/drivers/media/video/em28xx/em28xx-cards.c
 @@ -1347,6 +1347,22 @@ struct em28xx_board em28xx_boards[] = {
  			.amux     = EM28XX_AMUX_VIDEO,
  		} },
  	},
 +	[EM2860_BOARD_TERRATEC_GRABBY] = {
 +		.name            = "Terratec Grabby",
 +		.vchannels       = 2,
 +		.tuner_type      = TUNER_ABSENT,
 +		.decoder         = EM28XX_SAA711X,
 +		.xclk            = EM28XX_XCLK_FREQUENCY_12MHZ,
 +		.input           = { {
 +			.type     = EM28XX_VMUX_COMPOSITE1,
 +			.vmux     = SAA7115_COMPOSITE0,
 +			.amux     = EM28XX_AMUX_VIDEO2,
 +		}, {
 +			.type     = EM28XX_VMUX_SVIDEO,
 +			.vmux     = SAA7115_SVIDEO3,
 +			.amux     = EM28XX_AMUX_VIDEO2,
 +		} },
 +	},
  };
  const unsigned int em28xx_bcount = ARRAY_SIZE(em28xx_boards);
 
 @@ -1410,6 +1426,8 @@ struct usb_device_id em28xx_id_table[] = {
  			.driver_info = EM2870_BOARD_TERRATEC_XS },
  	{ USB_DEVICE(0x0ccd, 0x0047),
  			.driver_info = EM2880_BOARD_TERRATEC_PRODIGY_XS },
 +	{ USB_DEVICE(0x0ccd, 0x0096),
 +			.driver_info = EM2860_BOARD_TERRATEC_GRABBY },
  	{ USB_DEVICE(0x185b, 0x2870),
  			.driver_info = EM2870_BOARD_COMPRO_VIDEOMATE },
  	{ USB_DEVICE(0x185b, 0x2041),
 diff --git a/drivers/media/video/em28xx/em28xx.h 
 b/drivers/media/video/em28xx/em28xx.h
 index e801f78..fa2fb41 100644
 --- a/drivers/media/video/em28xx/em28xx.h
 +++ b/drivers/media/video/em28xx/em28xx.h
 @@ -103,6 +103,7 @@
  #define EM2860_BOARD_EASYCAP                      64
  #define EM2820_BOARD_IODATA_GVMVP_SZ		  65
  #define EM2880_BOARD_EMPIRE_DUAL_TV		  66
 +#define EM2860_BOARD_TERRATEC_GRABBY		  67
 
  /* Limits minimum and default number of buffers */
  #define EM28XX_MIN_BUF 4
 -----------------------------------------

 Is there maybe a wrong amux set? Which one could it be?
 Is sound-usb-audio somehow conflicting with em28xx module?

 I hope you have an idea what is wrong here!

 Florian Klink

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