String manipulation help needed

[johnEcash]

Hi I am trying to dothe following.

I have a movie server and I want to convert my avi movies to mkv files automaticly.
in below code I try to find the name of the avi file present in the folder, and strip the extension of it so I can use the same name as the original for the mkv file.

my output is:

we will be using  dexterS6E2.avi as input videofile
./run.sh: line 4: dexterS6E2: No such file or directory

#/bin/bash
INPUTFILE=`find -type f -name \*.avi`
echo 'we will be using ' $INPUTFILE 'as input videofile'
OUTPUTSTACK=`${INPUTFILE%.avi}`
OUTPUTFILE=`echo $OUTPUTSTACK '.mkv'`
echo 'The output videofile will be ' $OUTPUTFILE 
ffmpeg -i $INPUTFILE -vcodec ffv1 -acodec pcm_s16le $OUTPUTFILE

I have also tried to use the expr lengt and results in the same output

export NAMELENGTH=`expr length $INPUTFILE`
export OUTPUTLENGTH=`expr $NAMELENGTH - 5`
export OUTPUTFILE=`${INPUTFILE:2:OUTPUTLENGTH}`

I have a verry basic knowledge of scripting and tried to check for alternative ways but can't see why it outputs that way.

anyone able to help?

thanks

[LSalab]

Hello!

Well, I would use sed to change the extensio of your file.

check this out:

A=myfile.avi ; B=`echo $A | sed -r 's/\.avi$/\.mkv/'` ; echo $A $B

if you already have the original name, it is very simple to change the extension of it with sed.

I hope it helps.

[Rubberman]

To convert an avi file (avi is just a wrapper for other protocols, such as mp4) to an mkv file, you need to transcode it with a tool such as ffmpeg, which will do this in a streaming manner as you want. Here is a link to the ffmpeg web site: FFmpeg