ffprobe can be used to get width and height for the showwaves size
option.
This set me on the rigth track!
This is what my Windows batch file now looks like:
SET FFM="c:\programme\ffmpeg\bin\ffmpeg.exe"
SET FFP="C:\programme\ffmpeg\bin\ffprobe.exe"
for /f "tokens=5 delims==_" %%i in ('%FFP% -v error -of flat^=s^=_
-select_streams v:0 -show_entries stream^=width %1') do set W=%%i
for /f "tokens=5 delims==_" %%i in ('%FFP% -v error -of flat^=s^=_
-select_streams v:0 -show_entries stream^=height %1') do set H=%%i
%FFM% -y -i %1 -filter_complex
"[0:a]showwaves=s=%W%x%H%:mode=line,format=rgba[waves];[0:v]setsar=1:1,format=rgba[video];[waves][video]blend=all_mode='addition'"
-c:v libxvid -c:a copy %~dpn1_wav%~x1
-------
The line breaks stem from sending this per e-mail.
Please note that the colour format must be set to rgba in order to make
black background of the waves transparent.
Thanks a lot!
Wolfgang
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