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# Part of the tovid suite
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# =======================
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# Produce a short fast-forward-style preview of a video file.
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# Project homepage: http://www.tovid.org
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# Copyright (C) 2005 tovid.org <http://www.tovid.org>
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. Or see:
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# http://www.gnu.org/licenses/gpl.txt
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# Author: Rick Measham aka Woosta: rick@measham.id.au
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Usage: previd [OPTIONS] -in {input file} -out {output file}
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OPTIONS may be any of the following:
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-v, -version Prints previd version number only
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-y NUM Sets width and height. Use multiples of 16
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-sstep NUM Skip NUM seconds between frames
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-fps NUM Show each frame NUM times.
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SEPARATOR="========================================================="
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TMP_DIR=$(tempdir previd)
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# Make temp dir absolute
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TMP_DIR="${CWD}/${TMP_DIR}"
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LOG_FILE="${TMP_DIR}/previd.log"
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# ******************************************************************************
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# Print usage notes and optional error message, then exit.
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# Args: $@ == text string containing error message
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# ******************************************************************************
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printf "%s\n" "$USAGE"
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printf "%s\n" "$SEPARATOR"
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# Step 0: Get the parameters
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while test $# -gt 0; do
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if test $(expr $WIDTH % 16) -ne 0; then
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echo "-x must be a multiple of 16"
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if test $(expr $HEIGHT % 16) -ne 0; then
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echo "-y must be a multiple of 16"
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echo "Unrecognised command-line option $1"
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# Make sure infile and outfile were provided
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if test -z "$INFILE" || test -z "$OUTFILE"; then
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usage_error "Please provide input and output filenames using -in and -out options."
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if test -e "$INFILE"; then :;
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echo "Cannot open the input file $INFILE for reading."
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printf "%s\n" "$SEPARATOR"
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echo "Generating JPEGs from mplayer with the following command:"
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GEN_JPEG_CMD="mplayer -nosound -noautosub -vo jpeg:outdir=$TMP_DIR -sstep $STEP -vf scale=$WIDTH:$HEIGHT $INFILE"
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#eval "$GEN_JPEG_CMD >> $LOG_FILE 2>&1"
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printf "%s\n" "$SEPARATOR"
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echo "Creating symbolic links to get the multiple frames..."
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FRAMECOUNT=$(ls -l $TMP_DIR/*.jpg|wc -l)
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for i in $(seq 1 $FRAMECOUNT); do
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FI=$(printf "%08d" $i)
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for j in $(seq 1 $FRAMES_PER_STEP); do
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FND=$(printf "%08d" $FN)
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$(ln -s ${TMP_DIR}/$FI.jpg ${TMP_DIR}/out.$FND.jpg)
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echo "Step 3: Turn the symbolic links into an m2v"
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TO_M2V_CMD="jpeg2yuv -v 0 -b 1 -f 24 -j $TMP_DIR/out.%08d.jpg -I p | mpeg2enc -a 1 -n p -f 8 -o $TMP_DIR/$OUTFILE.m2v"
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echo "Step 4: Turn the m2v into an mpg"
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mplex -o $OUTFILE.mpg $TMP_DIR/$OUTFILE.m2v
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echo "Step 5: Clean up the temporary files"
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echo "$INFILE has been shortened by stepping $STEP and resized to $WIDTH x $HEIGHT."
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echo "Each resulting frame is now $FRAMES_PER_STEP frames of the final file"
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echo "The final file has been saved to $OUTFILE.mpg"
added
removed
src/previd
