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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