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| ID | Project | Category | View Status | Date Submitted | Last Update | ||||
| 0001722 | Kdenlive | User Interface | public | 2010-08-01 19:56 | 2010-09-14 23:01 | ||||
| Reporter | tidris769 | ||||||||
| Assigned To | j-b-m | ||||||||
| Priority | high | Severity | major | Reproducibility | always | ||||
| Status | closed | Resolution | fixed | ||||||
| Platform | 32 bit intel and alike | OS | Kubuntu Linux | OS Version | 9.10 | ||||
| Product Version | Recent git | ||||||||
| Target Version | Fixed in Version | 0.7.8 | |||||||
| Summary | 0001722: Severe audio distortion with overlapped clips | ||||||||
| Description | In some cases there is very severe audio distortion when playing the time line (and also in the rendered video) when two clips overlap in the time line. This problem has been around for a long time but I recently came up with a reproducible case. | ||||||||
| Steps To Reproduce | 1- Create a new project with profile 720p 59.94 fps. 2- Add the attached video clip to the project. 3- Drag the video clip to track 1 in the time line. 4- Cut the clip in half with the razor tool. 5- Drag one of the two clip pieces to track 2 so it partially overlaps the clip piece still in track 1. 6- Play the project. Note the severe audio distortion when playing the section where the two clips overlap. 7- Render the project. Note the rendered video has the same distortion. | ||||||||
| Tags | No tags attached. | ||||||||
| Build/Install Method | Manual build from SVN | ||||||||
| Attached Files |  t.mpg [^] (3,658,291 bytes) 2010-08-01 19:56 rendered.mpg [^] (4,343,737 bytes) 2010-08-09 14:51 t1.kdenlive [^] (16,243 bytes) 2010-08-09 14:56 | ||||||||
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(0005444) maxkessler (reporter) 2010-08-02 20:37 |
I'm having the same issue. Do audio tracks need composite transitions to be mixed? |
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(0005445) tidris769 (reporter) 2010-08-02 21:23 edited on: 2010-08-02 21:42 |
This distortion shows up when the clips that overlap are pieces cut from a common clip. If the overlapping clips aren't cut pieces the audio mixes without distortion, from what I have seen so far. Also sometimes I am able to get rid of the distortion by messing around with the cut clip pieces, but I haven't been able to pinpoint exactly what sequence of steps can make the distortion go away. |
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(0005485) ttill (developer) 2010-08-08 21:10 |
I also have this issue with latest devel versions of kdenlive, mlt. @maxkessler: audio does not need such a transition, composite is video only. |
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(0005497) tidris769 (reporter) 2010-08-09 15:01 edited on: 2010-08-09 15:04 |
I attached file rendered.mpg. The first half shows the severe audio distortion with overlapped cut clip pieces. The second half shows no distortion with overlapped clips that are not cut pieces. I also attached the t1.kdenlive project used to create that video. When I play the project with melt I hear distortion with the overlapped cut clip pieces but it isn't as severe as when kdenlive plays the project. Maybe this bug should be reclassified as an MLT issue instead? |
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(0005500) j-b-m (administrator) 2010-08-09 21:43 edited on: 2010-08-09 21:44 |
The problem comes from a known issue in MLT: audio is distorted when mixing the same producer clip on 2 different tracks. To work around that, Kdenlive creates one producer for each track (for those interested, the clip producers have a unique id number like "3". Kdenlive will then create a new copy of the producer for each track , like: "3_1" and "3_2" for tracks 1 and 2). That way, we can mix the same clip without distortion. Somehow a bug was introduced in Kdenlive that prevented that workaround to really work when moving a clip from one track to another. Issue should now be fixed in Kdenlive svn rev 4694, but if you have an existing project that has this issue, you will need to move your clip to another track then undo the move to fix the problem. Feedback welcome |
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(0005501) tidris769 (reporter) 2010-08-09 22:42 |
It looks fixed in svn 4694. Thank you!!! |
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(0005541) ttill (developer) 2010-08-11 13:53 |
Also fixed for me. |
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Issue History |
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| Date Modified | Username | Field | Change |
| 2010-08-01 19:56 | tidris769 | New Issue | |
| 2010-08-01 19:56 | tidris769 | File Added: t.mpg | |
| 2010-08-02 20:37 | maxkessler | Note Added: 0005444 | |
| 2010-08-02 21:23 | tidris769 | Note Added: 0005445 | |
| 2010-08-02 21:23 | tidris769 | Note Edited: 0005445 | View Revisions |
| 2010-08-02 21:42 | tidris769 | Note Edited: 0005445 | View Revisions |
| 2010-08-08 21:10 | ttill | Note Added: 0005485 | |
| 2010-08-08 21:11 | ttill | Status | new => acknowledged |
| 2010-08-09 14:51 | tidris769 | File Added: rendered.mpg | |
| 2010-08-09 14:56 | tidris769 | File Added: t1.kdenlive | |
| 2010-08-09 15:01 | tidris769 | Note Added: 0005497 | |
| 2010-08-09 15:03 | tidris769 | Note Edited: 0005497 | View Revisions |
| 2010-08-09 15:04 | tidris769 | Note Edited: 0005497 | View Revisions |
| 2010-08-09 21:01 | j-b-m | Assigned To | => j-b-m |
| 2010-08-09 21:01 | j-b-m | Status | acknowledged => assigned |
| 2010-08-09 21:43 | j-b-m | Note Added: 0005500 | |
| 2010-08-09 21:43 | j-b-m | Status | assigned => feedback |
| 2010-08-09 21:44 | j-b-m | Note Edited: 0005500 | View Revisions |
| 2010-08-09 22:42 | tidris769 | Note Added: 0005501 | |
| 2010-08-09 22:42 | tidris769 | Status | feedback => assigned |
| 2010-08-11 13:53 | ttill | Note Added: 0005541 | |
| 2010-08-11 13:53 | ttill | Status | assigned => resolved |
| 2010-08-11 13:53 | ttill | Resolution | open => fixed |
| 2010-08-11 13:53 | ttill | Fixed in Version | => Recent git |
| 2010-09-14 11:00 | j-b-m | Fixed in Version | Recent git => 0.7.8 |
| 2010-09-14 23:01 | j-b-m | Status | resolved => closed |
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