gistfile1.txt

#!/usr/local/bin/bash

PRES=Welcome_to_IoT_Devroom.webm
CAM=Wine_hacking_session.webm
TITLE="Test talk"
SUBTITLE="jjjjjj a talk to demonstrate the compositing setup"
SPEAKERS="Niels"

ffmpeg -framerate 1/5 -i artwork/preroll-%d.jpg \
-loop 1 -i artwork/bg.jpg \
-framerate 1/5 -i artwork/postroll-%d.jpg \
-i "$PRES" \
-i "$CAM" \
-filter_complex '
[0:0] setsar=1/1 [preroll];
aevalsrc=0:d=1 [silence_pre];
[2:0] setsar=1/1 [postroll];
aevalsrc=0:d=1 [silence_post];
[1:0] setsar=1/1 [bg];
[3:0] scale=800:600 [pres];
[4:0] scale=490:368, crop=368:368:61:0 [cam];
[bg][pres] overlay=x=16:y=64:eof_action=endall [bg_p];
[bg_p][cam] overlay=x=864:y=296 [bg_pc];
[bg_pc] drawtext=expansion=none:fontcolor=#ffffff:fontfile=artwork/font/Light.otf:fontsize=16:x=0.5*lh:y=H-2.5*lh:textfile=artwork/copyright, 
        drawtext=expansion=none:fontcolor=#ffffff:fontfile=artwork/font/Black.otf:fontsize=20:x=16:y=8:text='"$TITLE"',
        drawtext=expansion=none:fontcolor=#ffffff:fontfile=artwork/font/Light.otf:fontsize=16:x=16:y=28:text='"$SUBTITLE"',
        drawtext=expansion=none:fontcolor=#ffffff:fontfile=artwork/font/Roman.otf:fontsize=16:x=16:y=44:text='"$SPEAKERS"' [mainv];
[4:1] channelmap=map=FL|FL, compand=attacks=5|5:decays=10|10:volume=-20:points=-90/-90|-40/-20|0/-10:delay=5 [mic];
[3:1] compand=attacks=.3|.3:decays=15|15:volume=-20:points=-90/-90|-40/-20|0/-10:delay=1 [compa];
[compa][mic] amix=inputs=2 [maina];
[preroll][silence_pre] [mainv][maina] [postroll][silence_post] concat=n=3:v=1:a=1 [outv][outa]
' -map '[outv]' -map '[outa]' \
-r 50 -pix_fmt yuv420p \
 -vcodec libx264 -crf 22 -acodec aac -aq 80 -strict -2 test.mp4