MP4問題......

我之前聽日人講~
將一個mv轉檔...個mv本身係mpeg檔...轉成mtv檔案
then放係file到...
then~放入mp4既卸除式磁碟...
but當我開mp4黎睇...
睇唔到個mv..但係有嗰個file...
點解會咁既???
thx....