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#!/bin/sh
INPUT=$1
set -ex
[ -f "$INPUT" ]
case "$INPUT" in
*.mp4) OUTPUT=${INPUT%.mp4}.twitter.mp4 ;;
*.*) OUTPUT=${INPUT%.*}.twitter.mp4 ;;
*) OUTPUT=${INPUT}.twitter.mp4 ;;
esac
if [ ! -e "$OUTPUT" ]
then
# source: https://gist.github.com/nikhan/26ddd9c4e99bbf209dd7
ffmpeg -hide_banner \
-i "$INPUT" \
-vcodec libx264 \
-vf 'scale=640:trunc(ow/a/2)*2' \
-acodec aac \
-vb 1024k \
-minrate 1024k -maxrate 1024k \
-bufsize 1024k -ar 44100 \
-strict experimental \
-r 30 \
"$OUTPUT"
fi
video_length()
{
# source: https://superuser.com/questions/650291/how-to-get-video-duration-in-seconds/945604#945604
ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 "$1"
}
chunk_seconds=135 # twitter max is 140, but ffmpeg can run over specified time
video_length=$(video_length "$OUTPUT")
if [ "${video_length%.*}" -gt "$chunk_seconds" ]
then
# source: https://unix.stackexchange.com/questions/1670/how-can-i-use-ffmpeg-to-split-mpeg-video-into-10-minute-chunks/212518#212518
CHUNKS=${OUTPUT%.mp4}.%03d.mp4
ffmpeg -hide_banner \
-i "$OUTPUT" \
-c copy \
-map 0 \
-segment_time "$chunk_seconds" -f segment -reset_timestamps 1 "$CHUNKS"
fi
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