像這種簡單的字幕影片用AviSynth,寫一個avs用TMPGEnc轉成mpg檔,
再接到該影片檔前面,省得重壓影片檔.當然,你要先安裝AviSynth...

下面一段script把它存成sample.avs,用播放軟體打開播放效果.

BlankClip(length=300, width=320, height=240, fps=29.97, color=$000000)
Animate(0, 48, "Subtitle", last, "Hello, World!", 160, 120, 0, 99999, "Arial", 0, last, "Hello, World!", 25, 130, 0, 99999, "Arial", 48)

當然文字及特效參數你自行依需要修改了.
script參數設定參考網頁:
http://www.avisynth.org/index.php?page=AviSynthManual