I had ~50 videos in a directory that were encoded using on2 VP7 which was causing some problems on some of my home media players. Heres a quick one line command that will re-encode all files suffixed with .avi to use xvid :) Once the script has completed all the re-encodes will be suffixed with .new.avi. This isnt an example in uber quality re-encodes it was just good enough for me.
To re-encode a directory of avi files to use xvid and copy the audio:
for x in *.avi ; do mencoder "$x" -ovc xvid -oac copy -xvidencopts fixed_quant=4 -o "`echo $x | sed 's/\(.*\)\..*/\1/'`.new.avi" ; done & > /dev/null
After that I had a directory of WMV files (720p) I wanted to re-encode to h.264/MKV to do this in one long command would have been quite messy so I made a little bash script. You can edit the script to re-encode any supported file type.
To re-encode wmv to x264:
#!/bin/bash # Execute this script in a directory to re-encode all files to x264 with mp3 in a mkv # There are no arguments for the script! # Edit below for your own needs # # User to mail results to email@example.com # Files suffixed with this to be re-encoded suffix=wmv ### # Shouldnt need to edit below here ### IFS=$(echo -en "\n\b") DIR="$( cd "$( dirname "$0" )" && pwd )" echo "x264 re-encoder www.m00nie.com" >> encodelog echo "Re-encoding all $suffix files in $DIR" >> encodelog echo "x264 re-encoder www.m00nie.com" for x in *.$suffix do start=$SECONDS mencoder $x -ofps 30000/1001 -ovc x264 -x264encopts subq=1:frameref=1:pass=1:threads=2 -nosound -of lavf -o `echo $x | sed 's/\(.*\)\..*/\1/'`.mkv echo "*** Completed First Pass ***". mencoder $x -ofps 30000/1001 -ovc x264 -x264encopts subq=6:partitions=all:8x8dct:me=umh:frameref=5:bframes=3:weight_b:bitrate=3500:pass=2:threads=2 -oac mp3lame -lameopts vbr=3:br=192 -of lavf -o `echo $x | sed 's/\(.*\)\..*/\1/'`.mkv echo "*** Completed Second Pass ***" echo "Now tidying up" end=$SECONDS echo "$x re-encoded in $((end - start)) secs." >> encodelog rm divx2pass.log rm divx2pass.log.mbtree done echo "Emailing $mailuser" cat encodelog|mail -s "Re-encode job results" $mailuser echo exit 0
The script will search for all files suffixed with wmv (can be changed) and do a two pass re-encode with h264 using lame for the sound (192kb/s ABR). Since I ran this on quite big number of files I wanted to be notified when it was done rather than checking. It will mail the user defined and list all the files re-encoded with the number of seconds taken for each one.