Aiseesoft YouTube Converter Mate is not only a Video Converter but also an online YouTube Video Downloader. With it, you can download online video files from YouTube, Metacafe, Google Video, Yahoo Video, MySpace, iFilm, and many other online video websites, then convert these downloaed videos to all popular video(MPEG-4, H.264/MPEG-4 AVC, MOV, M4V, AVI, DivX, XviD, ASF, WMV, MPEG-1, MPEG-2, 3GP, 3GPP, MKV, FLV, SWF, VOB, DV, Super VCD, VCD, DVD, HD video) and audio(AAC, AC3, AIFF, AMR, AU, FLAC, MP3, M4V, MP2, OGG, WAV, WMA) formats. Key Features 1. Support multi-downloading tasks and multi-threads This YouTube Converter Mate can set maximum downloading tasks and maximum threads for every task. 2. Adjust video effect Aiseesoft YouTube Converter Mate could help you adjust video brightness, saturation and contrast. And the "Deinterlacing" functions can assist you to convert the interlaced video to a progressive one. 3. Trim and crop video You can trim and convert any segment of a video by setting its start and end time; also you are allowed to adjust the video playing region and selecting the aspect ratio. 4. Merge video clips This YouTube Converter Mate enables you to merge several video clips together and output a single video file. 5. Watermark video You can watermark your video in the form of a text or image. 6. Set the specific output parameters For you to get the exact file from the video site, this YouTube Converter Mate provides you more specific parameters including Video Resolution, Video Bitrate, Frame Rate, Encoder and Audio Channels, Sample Rate, Encoder, Audio Bitrate. 7. Audio track and subtitle You are able to select the audio track and subtitle for the output video from the drop-down list. 8. Preview the downloaded and converted video file The built-in player could help you preview the downloaded file on the preview window.