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|ID||Project||Category||View Status||Date Submitted||Last Update|
|0002330||Kdenlive||User Interface||public||2011-09-24 16:48||2012-08-24 21:41|
|Product Version||Recent git|
|Target Version||Fixed in Version|
|Summary||0002330: Muting an audio channel affects audio effects on other channels.|
|Description||I use cross fade the audio in video clips quite often, and suddenly the cross fading was not working properly. |
It sounded as if the clip that should be fading out is suddenly muted as the other clip starts fading in.
It took a while to track down. The only thing I did differently was to load an audio clip first, but when doing my favorite cross-fades, the sound was getting in the way, so I just muted the whole channel by clicking on the speaker button on the left of that channel.
|Steps To Reproduce||load a few clips on the timeline.|
make them overlap in time.
Fade out and in so that you get a cross fade effect.
test that the cross fading works as expected.
Load an music clip into one of the audio channels.
mute the audio channel, not the clip.
Now cross-fading does not work anymore.
This bug is also transferred to rendering, ie if you render a scene where the cross-fading does not work properly, it also does not work properly in the rendered output.
|Additional Information||As a workaround, one could just select all clips in the audio channel and mute them individually. Cross-fading works fine like that. Also, muting an empty channel has no effect on audio effects in other channels...|
|Tags||No tags attached.|
|Build/Install Method||Manual build from SVN|
This is issue is still present with the latest git version of mlt. I don't think it's in mlt anyways, as the rendered result is exactly the same as the preview.
Another way to describe it is that if a channel is muted, all the other channels do fades, but no two channels can produce sound at the same time... ie: there is no more mixing of audio channels if a completely unrelated channel is muted.
Strange thing is that this only becomes apparent if there is a clip in the channel that is getting muted. Just muting an empty channel has no effect on the other channels, as it should have.
|Confirmed, but the issue only seems to be triggered when muting the lowest used track. It seems to be a problem in the way MLT handles mixing, I am trying to find a workaround...|
|2011-09-24 16:48||evorster||New Issue|
|2011-09-25 16:46||evorster||Note Added: 0007368|
|2011-09-26 10:57||j-b-m||Note Added: 0007370|
|2011-09-26 10:57||j-b-m||Assigned To||=> j-b-m|
|2011-09-26 10:57||j-b-m||Status||new => acknowledged|
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