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-map 0 does not work, because this also maps the data stream which cannot be copied due to the unknown tag. I know how to not copy the data stream but wonder why ffmpeg cannot copy an existing stream from one mp4 to a new one.
– Alexander
Commented May 6, 2020 at 23:32

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Correct minor typos or mistakes
Clarify meaning without changing it
Add related resources or links
Always respect the author’s intent
Don’t use edits to reply to the author

create code fences with backticks ` or tildes ~
```
like so
```
add language identifier to highlight code
```python
def function(foo):
print(foo)
```
put returns between paragraphs
for linebreak add 2 spaces at end
_italic_ or **bold**
indent code by 4 spaces
backtick escapes `like _so_`
quote by placing > at start of line
to make links (use https whenever possible)
<https://example.com>
[example](https://example.com)
<a href="https://example.com">example</a>

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