Use heading subtitle file as watermark using mencoder

mencoder -sub heading.ssa -subpos 0 -subfont-text-scale 4 -utf8 -oac mp3lame -lameopts cbr=128 -ovc lavc -lavcopts vcodec=mjpeg -vf scale=320:-2,expand=:240:::1 -o output.avi input.flv
Create subtitle file heading.ssa with just one entry for the entire video duration. Command line sets that entry's text on top of the video as text watermark. If text is an URL works nice for sending people back to your site from a YouTube clip. Output file is lossless encoded and suitable for further processing. Subtitle file can be a URL so it's saved remotely.

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