https://bugs.kde.org/show_bug.cgi?id=391963
Bug ID: 391963
Summary: Some transparent clips appears with black background
on timeline or in Project bin
Product: kdenlive
Version: 17.12.3
Platform: Archlinux Packages
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: Video Display & Export
Assignee: j...@kdenlive.org
Reporter: ash...@linuxcomp.ru
Target Milestone: ---
Created attachment 111460
--> https://bugs.kde.org/attachment.cgi?id=111460&action=edit
Videos encoded in different codecs with transparent background
I am going to make motion graphics in Adobe After Effects or Apple Motion and
use it in kdenlive. I have explored available export video formats, because I
feel it more comfortable than image sequences.
Some codecs are not transparent in Kdenlive timeline and one codec is not
transparent in project bin clip icon.
I have tested all available standard export codecs in Ae which support alpha
(except DNxHD/DNxHR) and additionally I have installed TechSmith Screen Capture
codec v1 in Windows. It also supports transparency and became available to
export using it in Ae. In Motion I have tested ProRes 4444 and Animation (via
Apple Compressor settings) codecs.
Here is list of issues that I have found in format
Container - Codec - What's wrong - ffmpeg supports alpha:
Avi - tscc - bbg*, bbgpb* - probably not**
QuickTime - GoPro CineForm - bbg - yes
QuickTime - ProRes 4444 - bbg - yes
* bbg - means black background in timeline when placing above some clip instead
of transparent background
* bbgpb - black bg in project bin in clip icon instead of transparent
** I have tested if ffmpeg itself supports transparency for the codec. I used a
command like this:
ffmpeg -i normal_video.mp4 -i motion_graphics_with_transparent_bg.mov
-filter_complex "[0:v][1:v] overlay=25:25" -pix_fmt yuv420p -c:a copy
output.mp4
It worked for both mentioned codecs in quicktime, but did not work for
Avi-tscc. Maybe ffmpeg just do not support transparency for tscc? How can I
know that for sure? Because I would prefer tscc over Quicktime-Animation,
because it compresses file size much-much better.
Sample videos encoded with problematic codecs are attached in tar archive.
Additionally there is quicktime-animation sample, which appears transparent in
kdenlive, as expected.
TSCC codec for windows is available here: https://www.techsmith.com/codecs.html
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