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- #!/bin/bash
- # Written by Alexis Bezverkhyy <alexis@grapsus.net> in 2011
- # This is free and unencumbered software released into the public domain.
- # For more information, please refer to <http://unlicense.org/>
- function usage {
- echo "Usage : ffsplit.sh input.file chunk-duration [output-filename-format]"
- echo -e "\t - input file may be any kind of file reconginzed by ffmpeg"
- echo -e "\t - chunk duration must be in seconds"
- echo -e "\t - output filename format must be printf-like, for example myvideo-part-%04d.avi"
- echo -e "\t - if no output filename format is given, it will be computed\
- automatically from input filename"
- }
- IN_FILE="$1"
- OUT_FILE_FORMAT="$3"
- typeset -i CHUNK_LEN
- CHUNK_LEN="$2"
- DURATION_HMS=$(ffmpeg -i "$IN_FILE" 2>&1 | grep Duration | cut -f 4 -d ' ')
- DURATION_H=$(echo "$DURATION_HMS" | cut -d ':' -f 1)
- DURATION_M=$(echo "$DURATION_HMS" | cut -d ':' -f 2)
- DURATION_S=$(echo "$DURATION_HMS" | cut -d ':' -f 3 | cut -d '.' -f 1)
- let "DURATION = ( DURATION_H * 60 + DURATION_M ) * 60 + DURATION_S"
- if [ "$DURATION" = '0' ] ; then
- echo "Invalid input video"
- usage
- exit 1
- fi
- if [ "$CHUNK_LEN" = "0" ] ; then
- echo "Invalid chunk size"
- usage
- exit 2
- fi
- if [ -z "$OUT_FILE_FORMAT" ] ; then
- FILE_EXT=$(echo "$IN_FILE" | sed 's/^.*\.\([a-zA-Z0-9]\+\)$/\1/')
- FILE_NAME=$(echo "$IN_FILE" | sed 's/^\(.*\)\.[a-zA-Z0-9]\+$/\1/')
- OUT_FILE_FORMAT="${FILE_NAME}-%03d.${FILE_EXT}"
- echo "Using default output file format : $OUT_FILE_FORMAT"
- fi
- N='1'
- OFFSET='0'
- let 'N_FILES = DURATION / CHUNK_LEN + 1'
- while [ "$OFFSET" -lt "$DURATION" ] ; do
- OUT_FILE=$(printf "$OUT_FILE_FORMAT" "$N")
- echo "writing $OUT_FILE ($N/$N_FILES)..."
- ffmpeg -i "$IN_FILE" -vcodec copy -acodec copy -ss "$OFFSET" -t "$CHUNK_LEN" "$OUT_FILE"
- let "N = N + 1"
- let "OFFSET = OFFSET + CHUNK_LEN"
- done
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