Powershell script, executing commands to lots of files

Following powershell script goes recursively the folder ”J:\pictures” and converts all avi file to mp4 files. It uses ffmpeg (remember to download newest binary)

I couldn’t get invoke-expression to work (it gave some error about ”-” operator), so I just sticked all the commands to a text file d:\commands.txt and run it as a normal batch script.

I used this script to convert lots of videos shot with my camera to more compatible format.

"" > d:\commands.txt
foreach ($file in get-childitem "j:\pictures" -recurse -include "*.avi"){
$ffmpegprog = "`"C:\Program Files (x86)\WinFF\ffmpeg.exe`"";
$ffmpegparams = " -threads 2 -f mp4 -vcodec libx264 -b 1500k -flags +loop -cmp +chroma -deblockalpha 0 -deblockbeta 0 -b 1500k -maxrate 2000k -bufsize 4M -bt 256k -refs 1 -bf 3 -coder 1 -me_method umh -me_range 16 -subq 7 -partitions +parti4x4+parti8x8+partp8x8+partb8x8 -g 250 -keyint_min 25 -level 30 -qmin 10 -qmax 51 -qcomp 0.6 -trellis 2 -sc_threshold 40 -i_qfactor 0.71 -acodec aac -ab 256k -ac 2 -ar 44100";
$command = ($ffmpegprog + " -i `"" + $file.FullName + "`"" + $ffmpegparams + " `"" + [System.IO.Path]::ChangeExtension($file.FullName, ".mp4") + "`"");
$("$command") >> D:\commands.txt
}

You can just copy-paste the file to a powershell window.

For some reason direct execution of the commands.txt batch file didn’t work so you can just run it throught type

type d:\commands.txt > d:\commands.bat