It seems to get more interesting...
1. Since everything worked before Intrepid, I though it might be either
drivers, specifically, or systems integration (Ubuntu), in general - wasn't
that the switchover from ALSA to Pulse?
2. But since all other audio systems had no similar problems, I suspected
AviDeMux - perhaps exposing a problem lower down the stack, or just mishandling
it (more likely).
When André said he had similar problems with OSS and SDL (I didn't), I
really began to suspect AviDeMux, even though, initially, I just swapped
in the new OS under the application.
But perhaps the newer OS (both Intrepid and Jaunty) just were less
efficient, exposing the problem?
1. When I did a reinstall (vs. the original upgrade) on the problematic
system) the "default" device for ALSA cleaned up the noise and distortion to
the point that it was more usable than my Pulse alternative (that continued to
have dropout beats every few seconds).
2. Then, as a video was playing, I drug the window around with the mouse,
leading to substantially increased audio noise!
I think this has to be AviDeMux or maybe both the application and the
drivers. Notice the progression (I tested several systems since the
last posting). The older Intel audio chipsets have progressively worse
trouble with sound (on the newer operating systems), but the oldest,
with the faster CPU, didn't have the playback noise, only the sync
problem. The newer the chipset the better the audio. AND, reinstalling
vs. upgrading made improvements in the playback. Perhaps this is a
thread scheduling or priority (or CPU capacity) issue in the application
given the newer operating systems?
Case 1 - oldest system - nice sounding audio but rapidly looses sync
with the video:
$ sudo lshw -sanitize -class cpu -class multimedia
*-cpu:0
description: CPU
product: Intel(R) Pentium(R) 4 CPU 2.80GHz
width: 32 bits
clock: 200MHz
capabilities: boot fpu fpu_exception wp vme de pse tsc msr pae mce cx8
apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht
tm pbe pebs bts cid xtpr
*-multimedia
description: Multimedia audio controller
product: 82801EB/ER (ICH5/ICH5R) AC'97 Audio Controller
vendor: Intel Corporation
physical id: 1f.5
bus info: p...@0000:00:1f.5
version: 02
width: 32 bits
clock: 33MHz
capabilities: pm bus_master cap_list
configuration: driver=Intel ICH latency=0 module=snd_intel8x0
Case 2 - newer laptop - poor audio playback, but stays in sync with
video and shows no ill effects in renderings:
$ sudo lshw -sanitize -class cpu -class multimedia
*-cpu
description: CPU
product: Intel(R) Pentium(R) M processor 2.00GHz
width: 32 bits
clock: 133MHz
capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic
sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss tm pbe nx up
bts est tm2 cpufreq
*-multimedia
description: Multimedia audio controller
product: 82801FB/FBM/FR/FW/FRW (ICH6 Family) AC'97 Audio Controller
vendor: Intel Corporation
physical id: 1e.2
bus info: p...@0000:00:1e.2
version: 03
width: 32 bits
clock: 33MHz
capabilities: pm bus_master cap_list
configuration: driver=Intel ICH latency=0 module=snd_intel8x0
Case 3 - newest system - great audio playback and perfect sync
$ sudo lshw -sanitize -class cpu -class multimedia
*-cpu:0
description: CPU
product: Intel(R) Core(TM)2 CPU 6300 @ 1.86GHz
width: 64 bits
clock: 1066MHz
capabilities: boot fpu fpu_exception wp vme de pse tsc msr pae mce cx8
apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht
tm pbe nx x86-64 constant_tsc arch_perfmon pebs bts pni dtes64 monitor ds_cpl
vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm tpr_shadow cpufreq
*-multimedia
description: Audio device
product: 82801H (ICH8 Family) HD Audio Controller
vendor: Intel Corporation
physical id: 1b
bus info: p...@0000:00:1b.0
version: 02
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list
configuration: driver=HDA Intel latency=0 module=snd_hda_intel
At least my hope is that if this problem doesn't get solved, my new
laptop system may not have similar issues.
--
8.10 - avidemux - trouble initializing audio device
https://bugs.launchpad.net/bugs/321028
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