Convert Flash SWF files to MP4 using Linux ffmpeg and GNU Gnash

swf2mp4.sh

#!/bin/bash

# Requires:
#  - ffmpeg
#  - GNU Gnash:
#      $ git clone git://git.sv.gnu.org/gnash.git
#      $ cd gnash
#      $ ./autogen.sh
#      $ ./configure --enable-renderer=agg --enable-gui=dump --disable-menus --enable-media=ffmpeg --disable-jemalloc
#      $ make > /dev/null
#      $ make install


SWFFILE=$1
MP4FILE=${SWFFILE%.*}.mp4

TMPRAW=$(mktemp -t raw.XXXXXX)
TMPWAV=$(mktemp -t wav.XXXXXX)

# create raw-dump
GNASHCMD="dump-gnash -1 -r 3 -v -D $TMPRAW -A $TMPWAV $SWFFILE"
GNASHOUT="$(exec $GNASHCMD)"

# extract parameters
 WIDTH="$(echo $GNASHOUT | grep -o 'WIDTH=[^, }]*'      | sed 's/^.*=//')"
HEIGHT="$(echo $GNASHOUT | grep -o 'HEIGHT=[^, }]*'     | sed 's/^.*=//')"
   FPS="$(echo $GNASHOUT | grep -o 'FPS_ACTUAL=[^, }]*' | sed 's/^.*=//')"

# Convert
ffmpeg  \
	-i "${TMPWAV}" -f rawvideo -pix_fmt rgb32 -s:v ${WIDTH}x${HEIGHT} -r ${FPS}          \
	-i "${TMPRAW}"                            -c:v libx264            -r 30   -b 160k    \
	"${MP4FILE}"


# clean up
rm -rf "${TMPRAW}"
rm -rf "${TMPWAV}"