Merge/Join/Trim video files with video editor mac

Question 1: I have some mp4 video files and want to add special effects before i upload them to Youtube. How could i find an easy to use video tool to help me?
Question 2: I try to edit my flv file in Final Cut Pro or iMovie, but it can't import my flv file.
Question 3: Using QuickTime to join separate avi video files into a big one, but it cost so much time, how can i find an time-saving video editing software.
Question 4: I have a series of VOB files, which may be part of the same movie, and i want to combine them together into a simple file for further use in iDVD or other applications, there is an all-in-one application for help.
That's iOrgsoft Video Editor for Mac (Video Editor ). It is easy-to-use yet power-packed Mac video editing software that lets you effortlessly edit videos to look amazing! It's easy, utilizing classic editing functions like trim, crop, rotate, and professional extras.

Video Editor for Mac can do even more than that, it supports to convert between almost all popular video formats, and if you like the music in a video, feel free to extract the auido out and you can also put the mp3 on your media player for later on.
With it , you can easy join/merge video files together, like join avi files mac , join vob files mac .
Like to enjoy your videos on Youtube, you can also use it to add special effects , like add text, music, transition to videos. FLV Editor Mac is simple video editor to edit youtube flv video files. MP4 Editor Mac is far more flexible than iMovie, supporting split, cut or trim MP4 and other video files to MPEG1, MPEG2, AVI, FLV, 3GP, MP4 and WMV formats using a variety of codecs. with it, you can edit mp4 mac into smaller MP4 video clips, extract manually selected segment of an MP4 video file to new MP4 video file .
PVR Video Converter is easy convert pvr to galaxy tab for Samsung can't accept directly. It provide powerful editing function like video cropper,video clipper,video splitter.