From https://ffmpeg.org/ffmpeg-all.html#Format-Options :

avoid_negative_ts integer (output)

    Possible values:

    ‘make_non_negative’

Shift timestamps to make them non-negative. Also note that this affects only leading negative timestamps, and not non-monotonic negative timestamps.
    ‘make_zero’

        Shift timestamps so that the first timestamp is 0.
    ‘auto (default)’

        Enables shifting when required by the target format.
    ‘disabled’

        Disables shifting of timestamp.

So:
-avoid_negative_ts 1  means 'make_non_negative'


or

the option is
-avoid_negative_ts make_non_negative

??

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