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: If your video requires text, use the WebVTT format for cues, specifying start and end times in hh:mm:ss.ttt .
: Tools like mplayer also use -ss to start playback at a designated time. Example : mplayer -ss 00:17:30 -endpos 10 finalVideo.mp4 . Joining MP4 Files
: You can use the scale filter to resize an MP4, for example to 1920x1080px, while encoding.