I'm using the drawtext and drawbox avfilters on FFmpeg, two of the most poorly documented functions known to man.
I'm struggling to work out if and how I can use them on only a single frame, i.e., drawtext on frame 22.
Current command:
ffmpeg -i test.wmv -y -b 800k -f flv -vcodec libx264 -vpre default -s 768x432 \
-g 250 -vf drawtext="fontfile=/home/Cyberbit.ttf:fontsize=24:text=testical:\
fontcolor=green:x=100:y=200" -qscale 8 -acodec libfaac -sn -vstats out.flv
Two elements mentioned in the documentation are n and t. However, I only seem to be able to use them in x and y. Not in text or even as other parameters.
Any help or FFmpeg guidance would be gratefully received.