Contributing to Kdenlive

Tue Aug 21 19:53:19 BST 2018

Hi John

It comes 2 things to my mind:
-    Do you cut the audio at the zero point? In Audition (for example) 
is a function that you can cut only at that point (when the wave goes 
through zero) to avoid clicks.
-    When audio frequency (i.e. 44.1kHz) and video frequency (i.e. 
60fps) interfere each other after a time and from there you get clicks. 
Video rendering is always video frequency driven. This would be a FFMPEG 
problem.

Merlimau


Am 21.08.2018 um 19:55 schrieb johnar1:
> Hey Jean, thank you for that valuable info.
>
> I have tested the 18.08 version that you linked and unfortunately the 
> pops at the beginning of audio clips still occur, but I have made an 
> interesting discovery.
> When I render the entire project, there are three pops at the 
> beginning of 3 clips, let's say at 01:23, 02:02 and 03:15 in the time 
> line.
> These audio pops only come up in the rendered output, not during playback.
> When I only render a small selected zone surrounding the area where I 
> know the pop will be, it does not occur.
> Only when I render the full project, they appear.
> I have tried this with all three known audio pops that I have spotted 
> in the fully rendered project, and each time they disappear when I 
> only render a selected area around them.
>
> The next thing I have noticed is that switching the playback settings 
> betwen SDL and RTAudio  can affect this issue as well.
>
> As you know me now, I will now enter full testing mode and report back 
> to you with a more detailed analysis.
> I will compile the latest melt, ffmpeg and co in order to provide a 
> full report, but I will use the AppImage versio 18.8.0 which you have 
> suggested.
>
> Anything else I should consider?
>
> Best regards,
>
> John
>
>
> Sent with ProtonMail <https://protonmail.com> Secure Email.
>
> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> On August 20, 2018 10:23 AM, Jean-Baptiste Mardelle <jb at kdenlive.org> 
> wrote:
>
>> On 18.08.2018 14:55, johnar1 wrote:
>>
>>> Hey Jean and guys!
>>>
>>
>> Hello Johnar!
>>
>>
>>
>>> I have uncovered a new problem with the latest stable AppImage 
>>> 18.04.1 release of kdenlive which is very troublesome.
>>>
>>> Randomly, kdenlive will cause a "click" or "pop" sound at the 
>>> beginning of an audio track. I have observed that this happens the 
>>> most when two audio tracks are overlapping or a cut has been made at 
>>> the beginning of the a clip.
>>>
>>> I have also found that audio pops disappear in the same footage 
>>> disappear when switching from SDL to RTAudio in the settings.
>>>
>>> I am using a fresh install of Kubuntu 18.04 with updates and
>>> Mlt and ffmpeg versions all from the Appimage, so this has to be a 
>>> thing in kdenlive or maybe the latest Alsa / Pulseaudio package?
>>>
>>> I have tried some stuff suggested in forums such as exporting only 
>>> the audio in wav, but without luck.
>>>
>>
>> I have just uploaded the 18.08.0 AppImage containing the latest MLT. 
>> Could you check if the problem still happens ?
>> It is available here:
>>
>> https://files.kde.org/kdenlive/release/kdenlive-18.08.0-x86_64.AppImage.mirrorlist
>>
>> Thanks for your feedback.
>>
>> Jean-Baptiste
>>
>>
>>> Any ideas?
>>>
>>> Regards
>>>
>>>
>>>
>>> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
>>> On July 26, 2018 9:20 AM, Jean-Baptiste Mardelle <jb at kdenlive.org> 
>>> wrote:
>>>
>>>>
>>>> On 23.07.2018 00:21, Juku Trump wrote:
>>>>> Hi,
>>>>>
>>>>
>>>> Hello Juku!
>>>>
>>>> Thanks a lot for your contribution and sorry for my late reply. 
>>>> Your help is very welcome. I have now merged your contribution. 
>>>> Regarding the tests, they need some work and currently don't all 
>>>> pass and crash. We need to work on that.
>>>>
>>>> Regarding other tasks, we really need to make a list of UI 
>>>> improvements that could be done without too much knowledge of the 
>>>> whole code. I will try to spend some time on it tomorrow, help is 
>>>> welcome. But basically, if there is any UI related thing that you 
>>>> want to improve, feel free to ask and we can guide you if needed.
>>>>
>>>> Best regards,
>>>>
>>>> Jean-Baptiste
>>>>
>>>>
>>>>> My name is Juku. I am a film hobbyist and I have been using 
>>>>> Kdenlive for about 8 years. As I'm also a developer, I thought I 
>>>>> would try my hand on contributing to Kdenlive.
>>>>>
>>>>> I have mostly been a web developer so far, so I do not have much 
>>>>> experience with C++ (except for some tutorials) and I have never 
>>>>> done any Qt development.
>>>>>
>>>>> I viewed the "Junior Jobs" section in Kdenlive Development 
>>>>> Information page and tried to fix #384511 for start ("New project 
>>>>> window does not fit to laptop screen (1366x768)"). Thanks to a 
>>>>> hint by Christoph Feck in the comments below that bug, I got it 
>>>>> fixed and submitted the patch (D14281 
>>>>> <https://phabricator.kde.org/D14281>) for review.
>>>>>
>>>>> Currently I'm having some trouble with the automated tests. Should 
>>>>> they succeed in their current state or are there some known 
>>>>> problems with them?
>>>>>
>>>>> It would be helpful if someone would suggest some other tasks 
>>>>> which I could start with.
>>>>>
>>>>> Thanks,
>>>>> Juku
>>>
>

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