[kdenlive] [Bug 391963] Some transparent clips appears with black background on timeline or in Project bin

[Jean-Baptiste Mardelle]

https://bugs.kde.org/show_bug.cgi?id=391963

Jean-Baptiste Mardelle  changed:

   What|Removed |Added

 Status|UNCONFIRMED |RESOLVED
 Resolution|--- |FIXED

--- Comment #4 from Jean-Baptiste Mardelle  ---
Now fixed in MLT's git master

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[kdenlive] [Bug 391963] Some transparent clips appears with black background on timeline or in Project bin

[Ashark]

https://bugs.kde.org/show_bug.cgi?id=391963

--- Comment #3 from Ashark  ---
Thanks for reply and for suggestion.
I did not know that you are also a developer of mlt. Great respect to you =)!

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[kdenlive] [Bug 391963] Some transparent clips appears with black background on timeline or in Project bin

[Jean-Baptiste Mardelle]

https://bugs.kde.org/show_bug.cgi?id=391963

--- Comment #2 from Jean-Baptiste Mardelle  ---
Thanks for your detailed report. It is indeed a bug in MLT's qtblend transition
that I wrote. It does not correctly detect the alpha channel. I am
investigating, but in the meantime, as a workaround you can add a transition to
your clips, like cairo blend to force the alpha compositing.

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[kdenlive] [Bug 391963] Some transparent clips appears with black background on timeline or in Project bin

[Ashark]

https://bugs.kde.org/show_bug.cgi?id=391963

--- Comment #1 from Ashark  ---
I have tested mlt for supporting transparency in these codecs. I used the
following command:
melt normal_video.mp4 -track  -transition affine
where  is a png or video file with transparency.
Result is the same as for ffmpeg. Here is a table of results:

+-++-+--+
| container-codec | ffmpeg | mlt | kdenlive |
+-++-+--+
| png-none|   yes  | yes |yes   |
+-++-+--+
|   qt-animation  |   yes  | yes |yes   |
+-++-+--+
| avi-tscc|   no   |  no |no|
+-++-+--+
|qt-prores|   yes  | yes |no|
+-++-+--+
|   qt-cineform   |   yes  | yes |no|
+-++-+--+

So I can say that the fact that kdenlive is not supporting qt-prores and
qt-cineform is definitely a bug. And tscc is probably ffmpeg's unimplemented
feature.

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[kdenlive] [Bug 391963] Some transparent clips appears with black background on timeline or in Project bin

[Ashark]

https://bugs.kde.org/show_bug.cgi?id=391963

Ashark  changed:

   What|Removed |Added

 CC||ash...@linuxcomp.ru

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