Hi there, I'm Matt Sergej and would like to help you.
I understand what you are implementing and guessing you need a lot of ffmpeg commands to convert various formats of multimedia from one to the other.
With that in mind, this would be better as a fixed job (once all required format conversions are established - that can be part of a job too e.g. listing all meaningful conversions and then implementing commands for them). With a week of work needed this is a job for 500 USD.
Converting MP2 format to MP3 using ffmpeg might not get the exact quality audio back in terms of bitrate and encoding organization in the file - though it usually gets the same (time) length of the audio. It does feel the same when listening though.
So, can you provide an example MP2 file to analyze? Do you have a list of desired multimedia format conversions (including "create thumbnails of MP4 video at every X seconds")?
Bidding for fixed job as explained - and on vacation from Jul 8th till 13th.
Looking forward to your reply.
Matt