-ENCODER_LIST=`sed -n 's/^[^#]*ENC.*(.*, *\(.*\)).*/\1_encoder/p' "$source_path/libavcodec/allcodecs.c"`
-DECODER_LIST=`sed -n 's/^[^#]*DEC.*(.*, *\(.*\)).*/\1_decoder/p' "$source_path/libavcodec/allcodecs.c"`
-PARSER_LIST=`sed -n 's/^[^#]*PARSER.*(.*, *\(.*\)).*/\1_parser/p' "$source_path/libavcodec/allcodecs.c"`
-BSF_LIST=`sed -n 's/^[^#]*BSF.*(.*, *\(.*\)).*/\1_bsf/p' "$source_path/libavcodec/allcodecs.c"`
-MUXER_LIST=`sed -n 's/^[^#]*_MUX.*(.*, *\(.*\)).*/\1_muxer/p' "$source_path/libavformat/allformats.c"`
-DEMUXER_LIST=`sed -n 's/^[^#]*DEMUX.*(.*, *\(.*\)).*/\1_demuxer/p' "$source_path/libavformat/allformats.c"`
-OUTDEV_LIST=`sed -n 's/^[^#]*_MUX.*(.*, *\(.*\)).*/\1_muxer/p' "$source_path/libavdevice/alldevices.c"`
-INDEV_LIST=`sed -n 's/^[^#]*DEMUX.*(.*, *\(.*\)).*/\1_demuxer/p' "$source_path/libavdevice/alldevices.c"`
-PROTOCOL_LIST=`sed -n 's/^[^#]*PROTOCOL.*(.*, *\(.*\)).*/\1_protocol/p' "$source_path/libavformat/allformats.c"`
+find_things(){
+ thing=$1
+ pattern=$2
+ file=$source_path/$3
+ sed -n "s/^[^#]*$pattern.*(.*, *\\(.*\\)).*/\\1_$thing/p" "$file"
+}
+
+ENCODER_LIST=$(find_things encoder ENC libavcodec/allcodecs.c)
+DECODER_LIST=$(find_things decoder DEC libavcodec/allcodecs.c)
+PARSER_LIST=$(find_things parser PARSER libavcodec/allcodecs.c)
+BSF_LIST=$(find_things bsf BSF libavcodec/allcodecs.c)
+MUXER_LIST=$(find_things muxer _MUX libavformat/allformats.c)
+DEMUXER_LIST=$(find_things demuxer DEMUX libavformat/allformats.c)
+OUTDEV_LIST=$(find_things muxer _MUX libavdevice/alldevices.c)
+INDEV_LIST=$(find_things demuxer DEMUX libavdevice/alldevices.c)
+PROTOCOL_LIST=$(find_things protocol PROTOCOL libavformat/allformats.c)
+VIDEO_FILTER_LIST=$(find_things vf_ VF_ libavfilter/allfilters.c)
+SRC_FILTER_LIST=$(find_things vsrc_ VSRC_ libavfilter/allfilters.c)
+FILTER_LIST="$SRC_FILTER_LIST $VIDEO_FILTER_LIST"