is there a way to manipulate (pad, slice) a computed PTS timestamp within ffmpeg / drawtext? I've been able to get most of the manipulations I want on various PTS/timestamp things.. except this one.  I have a case where we have a running PTS that gets stamped via drawtext.  I currently use the %{pts:flt} which outputs millisecond accurate seconds.  This is great, but I ultimately need to format this in the format SS.ff, by which I mean we always keep only the last two digits of the seconds, and we ONLY print two significant digits of the fractional (micro/milli) second portion.
I've been through a truckload of various gmtime/strftime() attempts, and I'm stymied in part because it appears that only flt provides the fractional seconds part that I want, and it doesn't look like strftime() has support for width/padding/truncating?
The FFMPEG does not support strtime %f option; therefore, the fractional second works with AVTB only. The parameter is
-filter_complex &quot;drawtext=fontsize=90:x=20:y=20:text='pts=%{pts\:gmtime\:0\:%S %f} AVTB=%{eif\:trunc(t)\:d\:2}.%{eif\:(1M*t-1M*trunc(t))/10000\:d\:2}':box=1&quot;

and the result is