[pvrusb2] pvrusb2 vs. em8300

[Roger J. Allen]

On Wed, 22 Feb 2006, Michael Roitzsch wrote:

>
> ffmpeg -i /dev/video0 -f s16le - | hexdump -C
>
> If I see just zeros there, I know the audio is missing.

I don't get very many zeros when I run this;

[root at firkraag ~]# ffmpeg -i /dev/video0 -f s16le - | hexdump -C
ffmpeg version CVS, build 3342336, Copyright (c) 2000-2004 Fabrice Bellard
   configuration:  --prefix=/usr --libdir=/usr/lib --mandir=/usr/share/man --cpu=x86 --extra-cflags=-O2 -g -pipe -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -m32 -march=i386 -mtune=pentium4 -fasynchronous-unwind-tables --enable-mp3lame --enable-libogg --enable-vorbis --enable-theora --enable-faad --enable-faadbin --enable-faac --enable-libgsm --enable-xvid --enable-a52 --enable-a52bin --enable-pp --enable-shared-pp --enable-shared --enable-gpl --disable-debug --disable-opts --disable-strip
   built on Jan  4 2006 06:03:41, gcc: 4.0.2 20051125 (Red Hat 4.0.2-8)
Input #0, mpeg, from '/dev/video0':
   Duration: N/A, bitrate: 6224 kb/s
   Stream #0.0[0x1e0], 29.97 fps(r): Video: mpeg2video, yuv420p, 720x480, 6000 kb/s
   Stream #0.1[0x1c0]: Audio: mp2, 48000 Hz, stereo, 224 kb/s
Output #0, s16le, to 'pipe:':
   Stream #0.0: Audio: pcm_s16le, 48000 Hz, stereo, 1536 kb/s
Stream mapping:
   Stream #0.1 -> #0.0
Press [q] to stop encoding

>
> I can report one interesting finding I just made: When I load the
> em8300 modules after the pvrusb2 is initialized, the audio works, and
> so does the DXR3. I just had some crackling in the audio with this
> setup, but those appear to be transient.
>
> Can anyone draw some conclusions from the significance of the module
> loading order, before I use this to hack a workaround?
>

My prvusb2, tuner, msp3400, saa7115, and tda9887 modules get loaded
before the i2c_algo_bit, adv717x, and em8300 modules.  I do hear 
a quick crackle from the speakers when the em8300 loads, but the
audio seems to record and playback correctly when mythbackend makes
a recording.

Module                  Size  Used by
nvidia               4090000  12 
pcspkr                  2245  0 
lirc_serial            11904  0 
cx8800                 32589  0 
cx88xx                 62049  1 cx8800
ir_common               9797  1 cx88xx
bttv                  168881  0 
video_buf              21957  3 cx8800,cx88xx,bttv
btcx_risc               5065  3 cx8800,cx88xx,bttv
lirc_i2c                8196  1 
lirc_dev               12452  2 lirc_serial,lirc_i2c
nfsd                  226897  17 
exportfs                6337  1 nfsd
lockd                  60361  2 nfsd
nfs_acl                 3905  1 nfsd
sunrpc                146045  12 nfsd,lockd,nfs_acl
parport_pc             27909  1 
lp                     12937  0 
parport                35593  2 parport_pc,lp
autofs4                19653  1 
ipt_MASQUERADE          3777  1 
ipt_mark                1857  1 
iptable_nat             7749  1 
ip_nat                 18925  2 ipt_MASQUERADE,iptable_nat
ipt_MARK                2497  1 
iptable_mangle          3009  1 
ipt_REJECT              5953  1 
ipt_state               1985  16 
ip_conntrack           52717  4 ipt_MASQUERADE,iptable_nat,ip_nat,ipt_state
nfnetlink               6617  2 ip_nat,ip_conntrack
iptable_filter          3137  1 
ip_tables              20033  8 ipt_MASQUERADE,ipt_mark,iptable_nat,ipt_MARK,iptable_mangle,ipt_REJECT,ipt_state,iptable_filter
vfat                   12993  3 
fat                    51165  1 vfat
dm_mod                 57177  0 
video                  16197  0 
button                  6737  0 
battery                 9541  0 
ac                      4933  0 
usblp                  13633  0 
ohci1394               35593  0 
ieee1394              298009  1 ohci1394
uhci_hcd               32721  0 
ehci_hcd               33485  0 
em8300                 68504  0 
adv717x                 8116  1 
i2c_algo_bit            9289  3 cx88xx,bttv,em8300
emu10k1_gp              3905  0 
gameport               15689  2 emu10k1_gp
i2c_viapro              9045  0 
tda9887                15953  0 
saa7115                15313  0 
msp3400                33137  0 
tuner                  43505  0 
pvrusb2               105808  1 
v4l2_common             5953  3 cx8800,bttv,pvrusb2
v4l1_compat            14021  2 cx8800,pvrusb2
videodev                9665  4 cx8800,cx88xx,bttv,pvrusb2
tveeprom               15057  3 cx88xx,bttv,pvrusb2
i2c_core               21697  12 cx88xx,bttv,lirc_i2c,adv717x,i2c_algo_bit,i2c_viapro,tda9887,saa7115,msp3400,tuner,pvrusb2,tveeprom
snd_emu10k1           114021  1 
snd_rawmidi            24801  1 snd_emu10k1
snd_ac97_codec         88161  1 snd_emu10k1
snd_seq_dummy           3781  0 
snd_seq_oss            31809  0 
snd_seq_midi_event      7105  1 snd_seq_oss
snd_seq                49617  5 snd_seq_dummy,snd_seq_oss,snd_seq_midi_event
snd_seq_device          9037  5 snd_emu10k1,snd_rawmidi,snd_seq_dummy,snd_seq_oss,snd_seq
snd_pcm_oss            50545  0 
snd_mixer_oss          17985  2 snd_pcm_oss
snd_pcm                86981  3 snd_emu10k1,snd_ac97_codec,snd_pcm_oss
snd_timer              24901  3 snd_emu10k1,snd_seq,snd_pcm
snd_ac97_bus            2497  1 snd_ac97_codec
snd_page_alloc         10697  2 snd_emu10k1,snd_pcm
snd_util_mem            4929  1 snd_emu10k1
snd_hwdep               9185  1 snd_emu10k1
snd                    54309  11 snd_emu10k1,snd_rawmidi,snd_ac97_codec,snd_seq_oss,snd_seq,snd_seq_device,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer,snd_hwdep
soundcore               9889  3 em8300,snd
tg3                    99013  0 
natsemi                26913  0 
floppy                 62085  0 
st                     40417  0 
ext3                  129993  8 
jbd                    57941  1 ext3
advansys               79717  1 
sd_mod                 19137  2 
scsi_mod              134889  3 st,advansys,sd_mod

-- 
Roger J. Allen