[pvrusb2] audio pops and cracks in the recordings
funtoos at yahoo.com
Sun Jan 21 12:30:18 CST 2007
I am using 20061119 snapshot with 220.127.116.11 kernel. I get pops and cracks in the sound. My settings are as follows:
$ cat ctl_audio_layer/cur_val
$ cat /sys/class/pvrusb2/sn-*/ctl_volume/cur_val
$ cat /sys/class/pvrusb2/sn-*/ctl_audio_bitrate/cur_val
$ cat ctl_audio_mode/cur_val
$ cat ctl_audio_emphasis/cur_val
$ cat ctl_audio_crc/cur_val
I have these put into the /etc/init.d/local.start:
echo "10485760" > /sys/class/pvrusb2/sn-*/ctl_video_bitrate_peak/cur_val
echo "8388608" > /sys/class/pvrusb2/sn-*/ctl_video_bitrate/cur_val
echo "Constant Bitrate" > /sys/class/pvrusb2/sn-*/ctl_video_bitrate_mode/cur_val
echo "224 kbps" > /sys/class/pvrusb2/sn-*/ctl_audio_bitrate/cur_val
echo "53738" > /sys/class/pvrusb2/sn-*/ctl_volume/cur_val
One thing I noticed is that most of the pops/cracks happen in the shows which are telecast in HD 5.1 sound. I am using the regular analog cable to record my shows using mythtv. All (mythtv mixer, recorder, transcoder, pvrusb2) volume levels are set at 82%. I hear the pops in the .mpg file, so its not the transcoder.
Does anybody have any idea about this problem? It has ruined most of recordings because most of the content that I typical record is telecast in HD 5.1.
Thanks a lot for your help,
PS: should the ctl_audio_layer be Layer III ?
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