With a little more research (and somewhat more knowledge about ffmpeg) I
came to the following solution for a stopwatch with a defined decimal
precision:
* get the framerate via ffprobe and store it in a variable (i.e. !W!)
* divide the frame number by this rate
* display the result in two parts via
text=%%{eif\\:n/!W!\\:d}"."%%{eif\\:n/!W!*100\\:d\\:2}
NOTE: I am working under Windows, therefore somewhat exotic escaping in
batch files.
An offset could easily be accounted for by subtracting a user-provided
integer from 'n'.
Allowing for printf-style formatting of decimals in drawtext would still
be easier ...
The whole Windows batch code thus looks like:
SETLOCAL EnableDelayedExpansion
for /f "tokens=2 delims==/" %%i in ('C:\programme\ffmpeg\bin\ffprobe.exe
-v error -of flat^=s^=_ -select_streams v:0 -show_entries
stream^=r_frame_rate %1') do set W=%%~i
c:\Programme\ffmpeg\bin\ffmpeg -i %1 -y -filter:v
"drawtext=fontfile=/Windows/Fonts/arial.ttf:fontcolor=yellow:fontsize=42:text=%%{eif\\:n/!W!\\:d}"."%%{eif\\:n/!W!*100\\:d\\:2}:x=15:y=50"
-q 8 -vcodec libxvid %~dpn1_sw%~x1
Wolfgang Hugemann
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