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|ID||Project||Category||View Status||Date Submitted||Last Update|
|0000228||Kdenlive||Effects||public||2008-10-19 21:11||2008-11-12 22:28|
|Product Version||Recent git|
|Target Version||0.7.0||Fixed in Version||0.7.0|
|Summary||0000228: audio crossfade between different cutted parts of the same clip produces cracking noise|
|Description||1. put a clip on the timeline (track 1)|
2. cut the clip 2 times --> you got 3 parts
3. delete the 2nd part
4. move the 3rd part to second track a bit below the first part
5. create a crossfade between the clips with fade-out on first part and fade-in on third part
So you will get cracking noise when playing in preview and also after rendering.
Crossfade between different clips works fine.
|Tags||No tags attached.|
I have same problem, I did some research about it. So my perceptions:
0. Problems do not depend on audio frequency
A. WORKS CORRECT:
1. Two diffrent clips
2. Two same clips added to project list twice (first to first track, second to second track)
B. NO PROBLEMS:
1. With 0.6svn version on Kubuntu 8.10 32bit
1. 0.7svn on Kubuntu 8.10 64 bit, OpenSuSE 11.0 (up-to-date)
D. IT'S NO PROBLEM:
1. with soundcards (tested on two computers with three soundcards)
So, now I suppose it is problem in newest Kdenlive or using 64bit. If you want to test more let me know.
(I suggest to make this bug blocking 0.7 version, because I think it is very serious problem)
|If this is an MLT issue should i place a bug report on MLT mailing list?|
edited on: 2008-10-20 17:07
No, It appears as problem of Kdenlive because the script (taken from MLT demo) renders OK (the Aym8_S3BXKw.flv is from youtube).
"+voice over demo.txt" \
font="Sans Bold 72" \
-track Aym8_S3BXKw.flv \
-track Aym8_S3BXKw.flv out=149 Aym8_S3BXKw.flv \
|I can confirm this issue, although the issue did not exist with the first clip I tried. So, trying different clips may be neccesary.|
edited on: 2008-10-25 18:26
This problem is due to a bug in MLT. In fact, having the same clip overlapping on two different tracks is enough to reproduce the problem.
It looks like this is not easily fixable in MLT, see quote from Dan Dennedy:
Hmm, yeah, this is a big problem with the design of the framework and
the avformat producer (and vorbis producer). The audio is demuxed
and/or decoded by packets which contain sample counts that do not
correspond to the video frames. Therefore, the producers decode the
audio into a temporary buffer that might be larger than what the
mlt_frame_get_audio() requests. In that case, it first uses the
overflow for the next request if no seeking is required. When the
transition requests the audio from the same producer twice (A and B
frames), this temporary buffer gets used and creates all sorts of
problems with alignment/synchronization. This is not proving easy to
fix in the least; even hacks have proven unsuitable thus far.
Interestingly, the libdv producer does not suffer this problem because
it supplies the audio that is embedded into each DV frame and does not
use an overflow buffer.
I think I have an idea to work around it in Kdenlive, but it will require some rather important changes...
|Resample all transitions to the higher rate? Anyway this should not block Kdenlive release ... This is only 0.7.0. Then we can release 0.7.1, etc ... It is important to release very often.|
|Tagging it for 0.7.1.|
On 2008-10-31 in rev 2605 jb already added the workaround.
Here is the corresponding mail --> http://sourceforge.net/mailarchive/forum.php?thread_name=200810311058.30150.jb%40kdenlive.org&forum_name=kdenlive-devel [^]
Just because it also belongs to this bug-topic i will add a comment about (maybe) a side effect of this big changes here:
What i do is following:
1. Add a clip to track 1
2. Cut the clip two times
3. Remove the second part
4. Place the third part on track 2 overlapping the end of the first part
5. Add a fadeout effect on the end of the first part with the green blinking
6. Add a fadein effect on the beginning of the third part with the green
blinking clip indicator
This should look like this: http://pokerth.net/crossfade.png [^]
When playing this crossfade you will hear at the fadein on track 2 that the
volume is on 100% for a few frames. Then suddenly it goes to 0% and slowly
fades in. --> http://pokerth.net/crossfade.mp4 [^]
Can anybody reproduce this?
doitux, could the problem you describe be the same as http://www.kdenlive.org/mantis/view.php?id=307 [^] ?
jb har committed a fix for 307, I have just not had the time to test it. (Yes, I know, excuses, excuses). Could you perhaps test it, see if the svn rev 2622 fixes these problems (it should actually fix 228, 307 and "most of" 188).
madsdyd, no it is not 307 related. 307 is fixed in svn rev 2624 here.
But you are right, this bug 228 is also fixed in svn rev 2624.
My comment 800 was just about maybe a side-effect coming with the changes for 228 bugfix. maybe i will open a new report for this.
|Ok everyone, I found the bug responsible for problems described in comment 800. It is a bug in the MLT volume effect. I have a fix ready, but am currently waiting for Dan's opinion on the matter.|
|Fixed now in MLT svn, I think we can now completely close the bug...|
|Tested with Kdenlive 2636 and MLT 1227 - everything works as expected.|
|2008-10-19 21:11||doitux||New Issue|
|2008-10-20 09:27||repli2dev||Note Added: 0000476|
|2008-10-20 15:53||doitux||Note Added: 0000481|
|2008-10-20 17:06||repli2dev||Note Added: 0000482|
|2008-10-20 17:07||repli2dev||Note Edited: 0000482|
|2008-10-20 22:06||madsdyd||Note Added: 0000494|
|2008-10-20 22:06||madsdyd||Status||new => acknowledged|
|2008-10-23 00:26||madsdyd||Target Version||=> 0.7.0|
|2008-10-25 14:23||administrator||Note Added: 0000689|
|2008-10-25 14:23||administrator||Severity||minor => major|
|2008-10-25 14:24||administrator||Note Edited: 0000689|
|2008-10-25 14:24||administrator||Note Edited: 0000689|
|2008-10-25 14:26||administrator||Note Edited: 0000689|
|2008-10-25 14:28||administrator||Note Edited: 0000689|
|2008-10-25 14:32||administrator||Note Edited: 0000689|
|2008-10-25 14:34||administrator||Note Edited: 0000689|
|2008-10-25 18:26||administrator||Note Edited: 0000689|
|2008-11-01 13:48||jmpoure||Note Added: 0000793|
|2008-11-01 14:02||jmpoure||Note Added: 0000795|
|2008-11-01 14:02||jmpoure||Target Version||0.7.0 => 0.7.1|
|2008-11-01 18:02||doitux||Note Added: 0000800|
|2008-11-05 11:57||madsdyd||Note Added: 0000808|
|2008-11-06 00:56||doitux||Note Added: 0000815|
|2008-11-06 23:42||administrator||Note Added: 0000846|
|2008-11-07 09:38||administrator||Note Added: 0000851|
|2008-11-08 18:55||madsdyd||Note Added: 0000892|
|2008-11-08 18:55||madsdyd||Status||acknowledged => closed|
|2008-11-08 18:55||madsdyd||Resolution||open => fixed|
|2008-11-08 18:55||madsdyd||Fixed in Version||=> Recent git|
|2008-11-12 22:22||madsdyd||Fixed in Version||Recent git => 0.7.0|
|2008-11-12 22:28||madsdyd||Target Version||0.7.1 => 0.7.0|
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