How to add soft subtitles to .mp4 videos ( Embed .srt to .mp4 video files) using handbrake

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Here we have tutorial about adding soft subtitles to .mp4 videos. Here we are embedding .srt subtitle file to .mp4 video permanently. This subtitle is not hardcoded in the video. Software being used here is Handbrake. Download it from here http://handbrake.fr/downloads.php