I'm unable to reproduce the issue on my computer. The issue however may branch from the use of non-English characters in the place you wish to save the file. Please re-try by setting the file output to a place with only English characters.

Are you also able to test with Blender 2.83 or 2.90? https://builder.blender.org/download/

I kind of doubt this issue is caused by the use of non-English characters, but if it is caused by that, it's something that should be fixed.

crash log: P1365
so yes, a font issue.
BLI_assert failed: /Users/ankit/blender-build/blender/source/blender/blenkernel/intern/seqeffects.c:3825, BKE_sequencer_text_font_load(), at 'BLI_thread_is_main()'

In T76380#923431, @Alaska (Alaska) wrote:

I'm unable to reproduce the issue on my computer. The issue however may branch from the use of non-English characters in the place you wish to save the file. Please re-try by setting the file output to a place with only English characters.

Are you also able to test with Blender 2.83 or 2.90? https://builder.blender.org/download/

I kind of doubt this issue is caused by the use of non-English characters, but if it is caused by that, it's something that should be fixed.

Just now I tried to save file to place only use English characters and this is doesn't change nothing, same crash.

I also tried blender version 2.83 beta, and it's works fine. For now I have only one project and can't say anything for other projects, but this one works fine, I get mp4 file like I wanted.

Could you send the American Captain.ttf font file too ?
If using that file works here, on debug build, I'd close it as resolved.

Sure, here it is.
{F8511408}

Thanks for your help. I hope blender version 2.83 coming soon in Ubuntu's repository.