Heres a few lines out of the 700 line shell script; ${FFMPEG_CMD} -y -i $SIL -i ${STEP1_Q} -i $SIL -i ${STEP1_Q} -i $SIL -i ${STEP1_Q} -i $SIL -i ${ATTN_Q} -i $SIL -i ${ALERT_Q} -i ${STEP2BOUT} -i $SIL -i ${EOM_Q} -i $SIL -i ${EOM_Q} -i $SIL -i ${EOM_Q} -i $LOW -i $LOW -filter_complex concat=n=19:v=0:a=1 ${STEP2OUT} 2>> ${LOG_FILE} ...
${FFMPEG_CMD} -y -i ${STEP3OUT} -vf drawtext="fontfile=${FONT_FILE}:textfile=${INCOMING_DIR}/${VIDEO_LANG}.txt:fontcolor=white:fontsize=36:y=h-h/3:x=w-120*t" -b:v 9000k -maxrate 9000k -minrate 9000k -bufsize 1890k -acodec copy ${STEP4OUT} 2>> ${LOG_FILE}
...${FFMPEG_CMD} -i ${STEP2OUT} -f lavfi -i color=c=red:s=640x480:d="${TOTAL_CRAWLTIME}" -vf "subtitles=${SUBTITLES_FILE}:force_style='Alignment=10,Outline=0,Fontsize=18', subtitles=${SLIDE_NUMBERS_FILE}:force_style='Alignment=2,Outline=0', drawtext=fontfile=${FONT_FILE}:fontsize=30:fontcolor=white:y=line_h:x=(w-text_w)/2:text='MESSAGE D’FOO ou foo', drawtext=fontfile=${FONT_FILE}:fontsize=20:fontcolor=white:y=(h-80):x=(w-text_w)/2:text='English message to follow.'" -b:v 9000k -maxrate 9000k -minrate 9000k -bufsize 1890k -acodec libmp3lame ${STEP4OUT} 2>> ${LOG_FILE}
${FFMPEG_CMD} -y -i ${STEP5OUT} -vcodec libx264 -x264opts keyint=60:min-keyint=30:ref=3:bframes=0 -profile:v Main -level 3.1 -s 576:432 -g 60 -r 29.970 -crf 22 -maxrate:v 300k -bufsize 600k -acodec aac -ab 32k -ar 22050 -ac 1 -vbsf h264_mp4toannexb ${OUTPUT_DIR}/${BASE_FILE_NAME}.ts 2>> ${LOG_FILE}
I'll be honest, I didn't read through much. Ffmpeg gives me severe ptsd. My first task out of college was to write a procedurally generated video using ffmpeg, conform to dash, and get it under 150kb/s while being readable. Docs were unusable. Dash was only a few months old. And stackoverflow was devoid of help. I kid you not, the only way to get any insight was some sketchy IRC channel. (2016 btw, well past IRCs prime)