20.12.0 xubuntu 20.04 LTS ( update kdenlive with stable repository from 19.x to 20.12.0 )

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Rendering of /home/warro/video/docEmail.mp4 crashed

(process:101339): Gtk-WARNING **: 21:59:37.991: Locale not supported by C library. Using the fallback 'C' locale.
[mp4 @ 0x7f8a5c200f40]
Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead. [mp4 @ 0x7f8a5c200f40] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
[swscaler @ 0x7f8a0c412b00] Warning: data is not aligned! This can lead to a speed loss
melt: filter_typewriter.cpp:221: int update_producer(mlt_frame, mlt_properties, FilterContainer*, int): Assertion `(cont->xp.getContentNodesNumber() == cont->renders.size())' failed.

always crashing, 3 tests so far. This time after 18 minutes, and only this time a error message! two crashes before no error message, only "Using AVStream.codec ..." at beginning until "This can lead to a speed loss". Video rendering time always estimated 20 minutes, then increased to 37 minutes after 5 minutes.
Unfortunately I don't have information at which frame/minute rendering crashes.
Rendering with 50% quality, full project, H264, "Parallel processing ON" (without that 2 hrs estimated rendering time, untested so far), Project 720p 50fps

@4th try to render: I stopped cron (service cron stop, I have many cron jobs running like automatic backup), close as many programs as possible (thunderbird, telegram, LO, chromium). Now more RAM is free: 3GB more! Now 4GB RAM free (of 12GB, core i7 e531i7-3632QM). Still running since 20 minutes. "remaining 15 minutes". Hope now renders to end. .... ohhh .. remaining time sinking to 4 minutes in 3 minutes during I was writing my report here!!

@Rendering completed without error! BUT: title clips are often not positioned correctly, "transform" effect (move to right/left side) not considered, flickering at transitions , typewriter playing only first char, then nothing of whole text. I can't use that video (90MB)

@testing section with 1/2 minute lengh: same bad result, bugs in mp4-video like told above.
testing: without option "Parallel processing (experimental)": two differen 1/2 minute sections in timeline produce perfect video!! ==> I have to render without parallel processing. Now rendering lasts 3x times longer ... but I can cope with that I get my video, thats important. (With kdenlive 19.12.x I had not that problem, but there typewriter effect was not running / not installed, maybe thats confusing whole melting process?)

the typewriter effect is a work in progress.. you have to use a released appimage: https://files.kde.org/kdenlive/release/ ... 4.appimage
or wait for the official 20.12 appimage