vTool is a small video manipulating tool. With the help of it, you can extract audio from video, scale video, crop video, merge multiple video files together, and more. vTool can handle common video files including MP4, M4V, MOV, MKV, WMV, FLV, SWF, AVI, VP8, VP9, MPG, and GIF etc, and common audio formats such as MP2, MP3, Ogg, AAC, Opus, Speex, AMR, GSM, Wavpack, and WAV etc.
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