alsasink playback warnings in log

[Chris Tapp]

I'm sometimes getting glitches in audio streams when using the alsasink. The logs are showing:

0:00:00.094443765   743 0x7fb6181c4ea0 LOG                     alsa gstalsasink.c:847:gst_alsasink_open:<alsasink0> Opened device default
0:00:00.156982203   743 0x7fb604032a30 DEBUG                   alsa gstalsa.c:182:gst_alsa_detect_formats:<alsasink0> skipping non-raw format
0:00:00.157047579   743 0x7fb604032a30 DEBUG                   alsa gstalsa.c:182:gst_alsa_detect_formats:<alsasink0> skipping non-raw format
0:00:00.157072239   743 0x7fb604032a30 DEBUG                   alsa gstalsa.c:182:gst_alsa_detect_formats:<alsasink0> skipping non-raw format
0:00:00.157094091   743 0x7fb604032a30 DEBUG                   alsa gstalsa.c:182:gst_alsa_detect_formats:<alsasink0> skipping non-raw format
0:00:00.157125699   743 0x7fb604032a30 LOG                     alsa gstalsa.c:30:gst_alsa_detect_rates:<alsasink0> probing sample rates ...
0:00:00.157149135   743 0x7fb604032a30 DEBUG                   alsa gstalsa.c:49:gst_alsa_detect_rates:<alsasink0> Min. rate = 4000 (4000)
0:00:00.157194135   743 0x7fb604032a30 DEBUG                   alsa gstalsa.c:50:gst_alsa_detect_rates:<alsasink0> Max. rate = 2147483647 (-1)
0:00:00.157228695   743 0x7fb604032a30 LOG                     alsa gstalsa.c:339:gst_alsa_detect_channels:<alsasink0> probing channels ...
0:00:00.157251699   743 0x7fb604032a30 DEBUG                   alsa gstalsa.c:383:gst_alsa_detect_channels:<alsasink0> Min. channels = 1 (1)
0:00:00.157278051   743 0x7fb604032a30 DEBUG                   alsa gstalsa.c:384:gst_alsa_detect_channels:<alsasink0> Max. channels = 8 (10000)
0:00:00.157403763   743 0x7fb604032a30 DEBUG                   alsa gstalsa.c:463:gst_alsa_open_iec958_pcm:<alsasink0> Generated device string "default:{AES0 0x02 AES1 0x82 AES2 0x00 AES3 0x02}"
0:00:00.157481655   743 0x7fb604032a30 WARN                    alsa /media/SSD-Build/build-daisy-valleyisland/tmp/work/corei7-64-poky-linux/alsa-lib/1.0.27.2-r0/alsa-lib-1.0.27.2/src/conf.c:4694:snd_config_expand: alsalib error: Unknown parameters {AES0 0x02 AES1 0x82 AES2 0x00 AES3 0x02}
0:00:00.157521279   743 0x7fb604032a30 WARN                    alsa /media/SSD-Build/build-daisy-valleyisland/tmp/work/corei7-64-poky-linux/alsa-lib/1.0.27.2-r0/alsa-lib-1.0.27.2/src/pcm/pcm.c:2239:snd_pcm_open_noupdate: alsalib error: Unknown PCM default:{AES0 0x02 AES1 0x82 AES2 0x00 AES3 0x02}
0:00:00.157567695   743 0x7fb604032a30 DEBUG                   alsa gstalsa.c:469:gst_alsa_open_iec958_pcm:<alsasink0> failed opening IEC958 device: Invalid argument

I'm guessing the "Unknown parameters" and "Unknown PCM default" warning aren't good ;-) What do they mean and what do I need to look at to fix them?

--

Chris Tapp
opensource at keylevel.com
www.keylevel.com