Change extension of your file by your choice replacing extension name :
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In 4th line replace 'mp4' with EXISTING EXTENSION which you want to change.
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In 13th line replace 'mkv' with NEW EXTENSION.
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If your new extension have 4 letters instead of usual 3 letters, replace 5 with 6 in 9th line;
- e.g. if new extension is html (which is 4 letters) then,
replace 5 with 6 in 9th line.
- e.g. if new extension is html (which is 4 letters) then,