noreply at mythtv
Mar 14, 2012, 4:41 PM
Post #22 of 38
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Re: Ticket #10396: Periodical, short audio artifacts in one the channels when upmixing to 5.1
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#10396: Periodical, short audio artifacts in one the channels when upmixing to 5.1
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Reporter: blazej.lewcio@… | Owner: jyavenard
Type: Bug Report - General | Status: infoneeded_new
Priority: minor | Milestone: unknown
Component: MythTV - Audio Output | Version: Unspecified
Severity: medium | Resolution:
Keywords: upmixing | Ticket locked: 0
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Comment (by markspieth):
This is the interesting bit
{{{
2012-03-10 12:22:10.329782 I AO: BufSize=3072000, org_waud=1032192,
bpf=24
2012-03-10 12:22:10.361386 I AO: Pause 1
2012-03-10 12:22:10.363426 I AO: OutputAudioLoop: audio paused
2012-03-10 12:22:13.075240 W
RingBuf(/home/mythtv/Recordings/18403_20120310122212.mpg): Not starting
read ahead thread, already running
2012-03-10 12:22:13.136754 N Player(0): Forcing decode extra audio option
on (Video method requires it).
2012-03-10 12:22:13.754258 I AFD: Opened codec 0xffffffffa80cfb40,
id(MPEG2VIDEO) type(Video)
2012-03-10 12:22:13.754274 I AFD: codec MP2 has 2 channels
2012-03-10 12:22:13.754310 I AFD: Opened codec 0xffffffffa432ef10,
id(MP2) type(Audio)
2012-03-10 12:22:13.754340 I AFD: Audio Track #1 is A/V stream #2 and has
2 channels in the German language(6776178).
2012-03-10 12:22:13.754388 I AFD: Selected track 1: German MP2 2ch (A/V
Stream #2)
2012-03-10 12:22:13.754410 I AFD: Initializing audio parms from audio
track #1
2012-03-10 12:22:13.754441 I AFD: Audio format changed
from id(NONE) -1Hz -1ch -1bps (profile 0)
to id( MP2) 48000Hz 2ch 16bps (profile 0)
2012-03-10 12:22:13.754458 I AO: Needs upmix from 2 -> 6 channels
2012-03-10 12:22:13.754465 I AO: Reconfigure(): No change -> exiting
2012-03-10 12:22:13.758942 N AFD: Resetting byte context eof (livetv 1
was eof 0)
2012-03-10 12:22:13.949832 I AO: BufSize=3072000, org_waud=1040384,
bpf=24
}}}
notice that org_waud diff across the no change reconfigure is not a
multiple of 24 (6*4)
{{{
(1040384-1032192)/24 = 341.333
}}}
not sure why yet. Unexpected.
In this case this would rotate the channels by 2 putting L,R into LS,RS or
C,LFE, etc.
--
Ticket URL: <http://code.mythtv.org/trac/ticket/10396#comment:21>
MythTV <http://code.mythtv.org/trac>
MythTV Media Center
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