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IDProjectCategoryView StatusDate SubmittedLast Update
0006184ardourbugspublic2015-02-27 00:152020-04-19 20:17
Reporterrela Assigned Topaul  
PrioritynormalSeverityminorReproducibilityalways
Status closedResolutionfixed 
Summary0006184: crossfade with different in/out curves leads to 40dB peak in export
Descriptionweird crossfade, different type of in/out curves. this is at the start of a clip, fade out is "constant power" shaped and fade in is linear. pic attached and also relevant part of ".ardour".
results in 40dB peak in export (hence normalization results in all silence).
playback works fine, so does small selection export.

i've somehow managed to generate a weird crossfade. happened twice in the project.
in/out curves aren't of the same type. one is linear and the other is curved.
i'm not sure if this is a graphical thing but i noticed it because upon export track pops to 40dB when passing by that point.
40dB pop does not occur during playback nor if i select that part of the track for export. only when full export or very large selection.
resulting export is silence, i think because ardour is trying to normalize something with a 40dB spike in the middle.

if i change the crossfade type to any normal option (linear, etc) then export works fine.

ardour version:
  Ardour3.5.403 (built using 3.5-403-gec2cb31 and GCC version 4.8.2)
system:
  Linux rela-x230 3.13.0-45-generic 0000074-Ubuntu SMP Tue Jan 13 19:36:28 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
TagsNo tags attached.

Activities

2015-02-27 00:15

 

crossfade.png (164,083 bytes)   
crossfade.png (164,083 bytes)   

2015-02-27 00:16

 

region-info.txt (2,040 bytes)    
      <Region name="voz-hablado-21.1" muted="0" opaque="1" locked="0" video-locked="0" automatic="0" whole-file="0" import="0" external="0" sync-marked="0" left-of-split="0" right-of-split="0" hidden="0" position-locked="0" valid-transients="0" start="312968" length="682839" position="12262646" sync-position="312968" ancestral-start="0" ancestral-length="0" stretch="1" shift="1" positional-lock-style="AudioTime" layering-index="5" envelope-active="0" default-fade-in="0" default-fade-out="0" fade-in-active="1" fade-out-active="1" scale-amplitude="0.354813367128" id="1369649" type="audio" first-edit="nothing" source-0="1369631" master-source-0="1369631" channels="1">
        <Envelope default="yes"/>
        <FadeIn>
          <AutomationList automation-id="fadein" id="1369650" default="1" min-yval="0" max-yval="2" interpolation-style="Linear" state="Off" style="Absolute">
            <events>0 0
85355 1
</events>
          </AutomationList>
        </FadeIn>
        <InverseFadeIn>
          <AutomationList automation-id="fadein" id="1369651" default="1" min-yval="0" max-yval="2" interpolation-style="Linear" state="Off" style="Absolute">
            <events>0 1
17071 0.951056522081605
25606.5 0.891006515687236
34141.99609375 0.809017016387918
42677.5 0.707106781186547
51213 0.587785259867037
59748.498046875 0.453990516423957
68284 0.309016998827164
76819.5 0.156434467352082
85355 0
</events>
          </AutomationList>
        </InverseFadeIn>
        <FadeOut>
          <AutomationList automation-id="fadeout" id="1369652" default="1" min-yval="0" max-yval="2" interpolation-style="Linear" state="Off" style="Absolute">
            <events>0 1
85354 1e-07
</events>
          </AutomationList>
        </FadeOut>
        <InverseFadeOut>
          <AutomationList automation-id="fadeout" id="1369653" default="1" min-yval="0" max-yval="2" interpolation-style="Linear" state="Off" style="Absolute">
            <events>0 1e-07
85354 1
</events>
          </AutomationList>
        </InverseFadeOut>
      </Region>
region-info.txt (2,040 bytes)   

BenLoftis

2015-03-04 14:39

developer   ~0016394

Was this session imported from ardour v2? There is a known bug with v2 crossfades which is fixed in latest git.

rela

2015-03-04 14:45

reporter   ~0016395

nop, it was created with 3.5.386 or 3.5.129.

colinf

2015-03-04 16:58

updater   ~0016396

I wonder if this has the same or similar cause as 0005953. Does it still happen with recent git versions?

rela

2015-03-04 20:01

reporter   ~0016397

built from master at 10e183 and export works fine. should i close this?

there are a bunch of new nice things going on. i'm going to try out master, see
if it is stable for recording.

thanks.
salú

paul

2015-03-13 18:52

administrator   ~0016425

see notes. also, rela: yes, please close it.

system

2020-04-19 20:17

developer   ~0023409

Issue has been closed automatically, by Trigger Close Plugin.
Feel free to re-open with additional information if you think the issue is not resolved.

Issue History

Date Modified Username Field Change
2015-02-27 00:15 rela New Issue
2015-02-27 00:15 rela File Added: crossfade.png
2015-02-27 00:16 rela File Added: region-info.txt
2015-03-04 14:39 BenLoftis Note Added: 0016394
2015-03-04 14:45 rela Note Added: 0016395
2015-03-04 16:58 colinf Note Added: 0016396
2015-03-04 20:01 rela Note Added: 0016397
2015-03-13 18:52 paul Note Added: 0016425
2015-03-13 18:52 paul Status new => resolved
2015-03-13 18:52 paul Resolution open => fixed
2015-03-13 18:52 paul Assigned To => paul
2020-04-19 20:17 system Note Added: 0023409
2020-04-19 20:17 system Status resolved => closed