1 | #!/bin/bash
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2 |
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3 | # Written by Alexis Bezverkhyy <[email protected]> in 2011
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4 | # This is free and unencumbered software released into the public domain.
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5 | # For more information, please refer to <http://unlicense.org/>
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6 |
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7 | function usage {
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8 | echo "Usage : ffsplit.sh input.file chunk-duration [output-filename-format]"
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9 | echo -e "\t - input file may be any kind of file reconginzed by ffmpeg"
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10 | echo -e "\t - chunk duration must be in seconds"
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11 | echo -e "\t - output filename format must be printf-like, for example myvideo-part-%04d.avi"
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12 | echo -e "\t - if no output filename format is given, it will be computed\
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13 | automatically from input filename"
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14 | }
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15 |
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16 | IN_FILE="$1"
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17 | OUT_FILE_FORMAT="$3"
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18 | typeset -i CHUNK_LEN
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19 | CHUNK_LEN="$2"
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20 |
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21 | DURATION_HMS=$(ffmpeg -i "$IN_FILE" 2>&1 | grep Duration | cut -f 4 -d ' ')
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22 | DURATION_H=$(echo "$DURATION_HMS" | cut -d ':' -f 1)
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23 | DURATION_M=$(echo "$DURATION_HMS" | cut -d ':' -f 2)
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24 | DURATION_S=$(echo "$DURATION_HMS" | cut -d ':' -f 3 | cut -d '.' -f 1)
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25 | let "DURATION = ( DURATION_H * 60 + DURATION_M ) * 60 + DURATION_S"
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26 |
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27 | if [ "$DURATION" = '0' ] ; then
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28 | echo "Invalid input video"
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29 | usage
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30 | exit 1
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31 | fi
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32 |
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33 | if [ "$CHUNK_LEN" = "0" ] ; then
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34 | echo "Invalid chunk size"
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35 | usage
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36 | exit 2
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37 | fi
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38 |
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39 | if [ -z "$OUT_FILE_FORMAT" ] ; then
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40 | FILE_EXT=$(echo "$IN_FILE" | sed 's/^.*\.\([a-zA-Z0-9]\+\)$/\1/')
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41 | FILE_NAME=$(echo "$IN_FILE" | sed 's/^\(.*\)\.[a-zA-Z0-9]\+$/\1/')
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42 | OUT_FILE_FORMAT="${FILE_NAME}-%03d.${FILE_EXT}"
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43 | echo "Using default output file format : $OUT_FILE_FORMAT"
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44 | fi
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45 |
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46 | N='1'
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47 | OFFSET='0'
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48 | let 'N_FILES = DURATION / CHUNK_LEN + 1'
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49 |
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50 | while [ "$OFFSET" -lt "$DURATION" ] ; do
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51 | OUT_FILE=$(printf "$OUT_FILE_FORMAT" "$N")
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52 | echo "writing $OUT_FILE ($N/$N_FILES)..."
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53 | ffmpeg -i "$IN_FILE" -vcodec copy -acodec copy -ss "$OFFSET" -t "$CHUNK_LEN" "$OUT_FILE"
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54 | let "N = N + 1"
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55 | let "OFFSET = OFFSET + CHUNK_LEN"
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56 | done |
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